195 Results
Macroscopic and Microscopic Views of a Chemical Reaction   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
The Effect of Temperature   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Bond Enthalpies and Exothermic or Endothermic Reactions   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Alcohols   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
The Effect of a Change in Pressure   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Le Chatelier's Principle   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Reaction Mechanisms   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Energy and the Formation of Ions   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
What Chemists Do   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Rates of Spontaneous Processes   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Spontaneous Processes and Molecular Probability   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Solutions   
(Movie/Animation, Audio/Visual (9))
Reactions and demonstrations exploring the concepts of solutions.
Hydrogen   
(Movie/Animation, Audio/Visual (9))
Reactions and explosions involving hydrogen and its compounds are demonstrated.
Reactions: Chlorine   
(Movie/Animation, Audio/Visual (9))
Reactions and explosions involving chlorine are demonstrated.
Iodine   
(Movie/Animation, Audio/Visual (8))
Reactions and explosions involving iodine and its compounds are demonstrated.
TNT Detonation   
(Movie/Animation, Audio/Visual (7))
TNT is stable in the presence of shock, but can be detonated by adding a chemical priming agent.
Reactions with Potassium   
(Movie/Animation, Audio/Visual (7))
Reactions involving potassium are demonstrated.
Explosive Combustion of Peroxyacetone (Version 2)   
(Movie/Animation, Audio/Visual (7))
In this demonstration, the peroxyacetone is tightly wrapped with an inserted thumbtack and ignited with an electric arc, resulting in an explosive detonation.
Reactions of Nitric Acid   
(Movie/Animation, Audio/Visual (7))
These demonstrations illustrate the production of nitric acid and its reaction with various forms of calcium carbonate found in nature, namely marble, limestone, chalk, and eggshell.
Reaction, Microscale: Potassium Dichromate with Silver Nitrate   
(Movie/Animation, Audio/Visual (7))
A crystal of potassium dichromate is carefully combined with a solution of silver nitrate under a microscope. The reaction takes some time, so it is shown in a series of seven sequential videos. To see the entire reaction you need to play all seven.
Decomposition Reactions   
(Movie/Animation, Audio/Visual (6))
Various examples of decomposition reactions are presented.
Rapid Combustion of Peroxyacetone (Version 1)   
(Movie/Animation, Audio/Visual (6))
In this demonstration, the peroxyacetone is piled loosely onto an iron surface and ignited with an electric arc, resulting in a ball of flame and a muffled report.
Exploding Soap Bubbles: Hydrogen + Oxygen   
(Movie/Animation, Audio/Visual (6))
Explosions of bubbles filled with only hydrogen and with varying ratios of hydrogen and oxygen are demonstrated.
Combination Reactions   
(Movie/Animation, Audio/Visual (6))
Videos of various combination reactions.
Exploding Soap Bubbles: Hydrogen + Oxygen   
(Movie/Animation, Audio/Visual (6))
Explosions of bubbles filled with only hydrogen and with varying amounts of hydrogen and oxygen are demonstrated.
Exploding Soap Bubbles: Hydrogen + Oxygen   
(Movie/Animation, Audio/Visual (6))
A series of three videos shows that as the ratio of oxygen to hydrogen in soap bubbles increases, the explosions that occur when the bubbles are ignited get louder. (The fact that with an excess of oxygen the explosions would become softer again is not shown.) Each video is repeated with no voice-over so that only the sounds of the explosions are heard. Five still images are provided to show the stoichiometry on the molecular scale. The videos are intended to be shown in order beginning with Hydrogen Alone and ending with hydrogen plus more oxygen.
Addition Reactions of Alkenes   
(Movie/Animation, Audio/Visual (6), Movie/Animation (1))
The Diels-Alder reaction, addition of oxygen to tetrakis(N, N-dimethylamino) ethylene, polymerization of ethylene, and addition of iodine to a-pinene are demonstrated. Molecular models of ethene are shown.
Oxidation-Reduction (Redox) Reactions   
(Movie/Animation, Audio/Visual (5))
Demonstrations exploring oxidation/reduction chemistry.
Reactions: Alkali Metals with Water   
(Movie/Animation, Audio/Visual (5))
Alkali Metals are shown reacting in water.
Reactions: Nonmetals with Air   
(Movie/Animation, Audio/Visual (5))
Various nonmetallic elements reacting with air are shown.
Reactions with Transition Metals   
(Movie/Animation, Audio/Visual (5))
A number of reactions with transition metals are demonstrated.
Nonmetals   
(Movie/Animation, Audio/Visual (5))
Nonmetals are ignited under various conditions.
Reactions in Aqueous Solutions   
(Movie/Animation, Audio/Visual (5))
Various reactions in aqueous solutions are shown.
Reactions of Sulfurous Acid   
(Movie/Animation, Audio/Visual (5))
These demonstrations illustrate the production and effects of sulfur dioxide, a pollutant generated by the burning of sulfur impurities in coal. The sulfurous acid produced by dissolving sulfur dioxide in water is allowed to react with various forms of calcium carbonate found in nature, namely marble, limestone, chalk, and eggshell.
Reactions: Magnesium and Magnesium Compounds   
(Movie/Animation, Audio/Visual (5))
Videos in this group show chemical reactions of magnesium and of magnesium ions in solution.
Bromination of Hydrocarbons   
(Movie/Animation, Audio/Visual (5))
The light initiated bromination of pentane, hexane isomers, alkyl benzenes and a comparison of bromination of pentane and pentene are demonstrated.
Reactions of Sulfuric Acid   
(Movie/Animation, Audio/Visual (4))
Reactions of materials reacting with sulfuric acid are shown.
Reactions: Alkaline Earth Metals with Acids   
(Movie/Animation, Audio/Visual (4))
Alkali earth metals are shown reacting with acids.
Reactions: Alkaline Earth Metals with Air   
(Movie/Animation, Audio/Visual (4))
Alkali earth metals are shown reacting in air.
Reactions: Alkali Metals with Other Elements   
(Movie/Animation, Audio/Visual (4))
Alkali Metals are shown reacting with various elements.
Formation of Carbon from Carbohydrate   
(Movie/Animation, Audio/Visual (4))
Sulfuric acid has a very high affinity for water. It is shown to dehydrate a carbohydrate (sucrose) forming carbon. Sulfuric acid is reduced to sulfur dioxide, which bleaches a rose petal. In a second experiment, the sulfur dioxide reduces purple permanganate to nearly colorless manganese(II).
Energy from Oxidation of Food   
(Movie/Animation, Audio/Visual (4))
Food undergoes rapid oxidation when placed in molten potassium chlorate.
Metals   
(Movie/Animation, Audio/Visual (4))
Samples of metals are ignited or heated over a flame, resulting in oxide formation.
Chemical Properties of Sulfur Dioxide   
(Movie/Animation, Audio/Visual (4))
Reactions involving sulfur dioxide.
Alkaline Earths Reactions   
(Movie/Animation, Audio/Visual (4))
Reactions of the alkaline earth metals in air, water, acid, and other compounds.
Nonmetals   
(Movie/Animation, Audio/Visual (4))
Other flames and explosions involving nonmetals are demonstrated.
Aluminum: Reactions   
(Movie/Animation, Audio/Visual (4))
Reactions involving aluminum are demonstrated.
Reactions: Acetylene   
(Movie/Animation, Audio/Visual (4))
Preparation of acetylene and the reaction of chlorine with acetylene are demonstrated. An antique carbide lamp is also demonstrated.
Oxidation-Reduction Reactions   
(Movie/Animation, Audio/Visual (4))
Electrolysis reactions and the action of nitric acid on iron and copper illustrate the concepts of oxidation and reduction. Also three oxidation-reduction reactions are shown under a microscope.
Orange Tornado: Precipitation of Mercury(II) Iodide - Version 2   
(Movie/Animation, Audio/Visual (4))
When mercury(II) nitrate and potassium iodide are combined with rapid stirring, an orange tornado of mercury(II) iodide is formed.
Reactions, Microscale: Oxidation-Reduction   
(Movie/Animation, Audio/Visual (4))
Three oxidation-reduction reactions are shown under a microscope. They are silver with mercury chloride, aluminum with gold chloride, and tin with gold chloride.
Acid Base Reactions of Sulfur Dioxide   
(Movie/Animation, Audio/Visual (3))
Acid base reactions involving sulfur dioxide are shown.
Reactions: Alkaline Earth Metals with Water   
(Movie/Animation, Audio/Visual (3))
Alkali earth metals are shown reacting in water.
Reactions: Alkali Metals with Base   
(Movie/Animation, Audio/Visual (3))
Alkali Metals are shown reacting with base.
Reactions: Alkali Metals with Acids   
(Movie/Animation, Audio/Visual (3))
Alkali metals are shown reacting with acids.
Reactions: Nonmetals with Base    
(Movie/Animation, Audio/Visual (3))
Nonmetallic elements are shown reacting with bases.
Halogens   
(Movie/Animation, Audio/Visual (3))
Other flames and explosions involving halogens are demonstrated.
Combustion of White Phosphorus   
(Movie/Animation, Audio/Visual (3))
Phosphorus combines with oxygen in a highly exothermic reaction.
Combustion Reactions   
(Movie/Animation, Audio/Visual (3))
A number of dramatic combustion reactions are demonstrated.
Hydrogen + Chlorine Cannon   
(Movie/Animation, Audio/Visual (3))
When a corked test tube containing a mixture of hydrogen and chlorine is struck by light from a burning magnesium ribbon, the resulting explosion propels the cork out of the test tube.
Aldol Condensation Reactions   
(Movie/Animation, Audio/Visual (3))
Aldol condensation reactions are demonstrated.
Diels-Alder Visualization   
(Movie/Animation, Audio/Visual (3))
Several computer animations of a Diels-Alder reaction that were created as an undergraduate student project are presented.
Combustion of Methane   
(Movie/Animation, Audio/Visual (3))
Methane combustion in balloons, a Bunsen burner flame, and methane combustion in chlorine are demonstrated.
Metallocene Catalyzed Polymerization of Ethylene   
(Movie/Animation, Audio/Visual (3))
Polymerization chemistry is demonstrated by the reaction between ethylene and a Ziegler-Natta catalyst.
Precipitation Reactions   
(Movie/Animation, Audio/Visual (3))
Two versions of the Orange Tornado, two reactions under a microscope, and updated stills of other precipitation reactions provide dramatic visual displays of solid formation.
Orange Tornado: Precipitation of Mercury(II) Iodide - Version 1   
(Movie/Animation, Audio/Visual (3))
When mercury(II) nitrate and potassium iodide are combined with rapid stirring, an orange tornado of mercury(II) iodide is formed.
Reactions, Microscale: Precipitation   
(Movie/Animation, Audio/Visual (3))
Here we show two precipitation reactions under a microscope. They are potassium dichromate crystal with silver nitrate and potassium iodide with lead nitrate.
Combustion Reactions   
(Movie/Animation, Audio/Visual (3))
Combustion reactions of methane, hydrogen, hexane, and natural gas in chlorine are demonstrated.
Precipitation Reactions   
(Movie/Animation, Audio/Visual (21))
Approximately 2 mL of Solution A is added to a sample of Solution B with a dropping pipet. If a precipitate forms, the resulting precipitate is supended in the mixture. The mixture is then stirred with a glass stirring rod and the precipitate is allowed to settle for about a minute.
Transition Element Reactions   
(Movie/Animation, Audio/Visual (20))
Reactions of transition elements in water, air, acids, and bases.
Reactions Under a Microscope   
(Movie/Animation, Audio/Visual (2))
Microscale redox and precipitation reactions.
Reactions: Nonmetals with Acids   
(Movie/Animation, Audio/Visual (2))
Nonmetallic elements are shown reacting with acids.
Ring Strain   
(Movie/Animation, Audio/Visual (2))
Mixing solid iodine and cyclohexene shows little reaction but mixing iodine and alpha-pinene produces a very vigorous exothermic reaction and sublimation of solid iodine to dense iodine vapor.
Induction by Iron(II) of the Oxidation of Iodide by Dichromate   
(Movie/Animation, Audio/Visual (2))
Acidic aqueous solutions containing dichromate and iodide ions are mixed with no reaction. The addition of a solution of iron(II) ion induces the rapid formation of brown triiodide ion.
Reactions with Sodium   
(Movie/Animation, Audio/Visual (2))
Reactions involving sodium are demonstrated.
Reactions involving Acetylene   
(Movie/Animation, Audio/Visual (2))
Some movies relating to acetylene are presented.
Combustion of Hexane   
(Movie/Animation, Audio/Visual (2))
Combustion of hexane with limited oxygen and addition of water to burning hexane are demonstrated.
Blue Bottle, Red and Blue Bottle   
(Movie/Animation, Audio/Visual (2))
Color changes are caused by reactions of oxygen in the air with chemicals in a solution. The colors fade over time, but can be regenerated by shaking the flask containing the solution.
Flames and Explosions, Other Than Combustion Reactions   
(Movie/Animation, Audio/Visual (2))
Flames and explosions, other than combustion reactions, are demonstrated.
Reactions of Iodine with alpha-Pinene   
(Movie/Animation, Audio/Visual (2))
Reactions of Iodine with alpha-Pinene
Bromine   
(Movie/Animation, Audio/Visual (2))
Reactions and explosions involving bromine are demonstrated.
Dust Explosion   
(Movie/Animation, Audio/Visual (2))
Here are two demonstrations of the principle behind a grain elevator explosion. Lycopodium powder is dispersed inside closed containers containing a lighted candle resulting in explosions.
Reaction: Potassium with Bromine   
(Movie/Animation, Audio/Visual (2))
A small piece of potassium is carefully added to liquid bromine, producing a violent reaction.
Sulfur   
(Movie/Animation, Audio/Visual (2))
Reactions and explosions involving sulfur are demonstrated.
Reactions with Zinc   
(Movie/Animation, Audio/Visual (2))
Reactions involving zinc are demonstrated.
Combustion of Peroxyacetone   
(Movie/Animation, Audio/Visual (2))
The combustion of peroxyacetone is demonstrated in two ways.
Nitrogen   
(Movie/Animation, Audio/Visual (2))
A reaction with nitrogen is demonstrated.
Sucrose Dehydration gives Sulfur Dioxide   
(Movie/Animation, Audio/Visual (2))
Sulfuric acid dehydrates sucrose forming carbon.
Combustion of Hexane   
(Movie/Animation, Audio/Visual (2))
Combustion of hexane with limited oxygen and addition of water to burning hexane are demonstrated.
Reaction, Microscale: Mercury With Silver Nitrate   
(Movie/Animation, Audio/Visual (2))
A droplet of mercury is carefully combined with a solution of silver nitrate under a microscope.
Reaction, Microscale: Tin with Gold(III) Chloride   
(Movie/Animation, Audio/Visual (2))
A piece of metallic tin is carefully combined with a solution of gold(III) chloride under a microscope.
Acid Base Reactions   
(Movie/Animation, Audio/Visual (16))
Simple experiments show the titration of acids with sodium hydroxide and the generation of acid from carbon dioxide in water.
Polymers   
(Movie/Animation, Audio/Visual (14))
Formation of formaldehyde copolymers, nylon rope, high and low density polyethylene, combustion of polyethylene and polystyrene, Beilstein test, formation of solid latex, cleaning oil spills, slime, solid foams, super absorbent polymer, formation of polyurethane foam under normal and micro gravity, and construction of a rod climbing apparatus are demonstrated.
Oxygen   
(Movie/Animation, Audio/Visual (12))
Reactions and explosions involving oxygen and its compounds are demonstrated.
Oxidation-Reduction Reactions   
(Movie/Animation, Audio/Visual (11))
Reactions or demonstrations exploring oxidation/reduction chemistry.
Organic Compounds   
(Movie/Animation, Audio/Visual (11))
An assortment of organic compounds are ignited under various conditions.
Enthlapy-Thermodynamics   
(Movie/Animation, Audio/Visual (10))
Reactions and demonstrations the explore thermodynamic concepts.
Reactions: Nonmetals with Water   
(Movie/Animation, Audio/Visual (1))
Nonmetallic elements are shown reacting with water.
Chemical Reactions (Netorials)   
(Instructional Material (1))
Chemical Reactions: this is a resource in the collection "Netorials". The Netorials cover selected topics in first-year chemistry including: Chemical Reactions, Stoichiometry, Thermodynamics, Intermolecular Forces, Acids & Bases, Biomolecules, and Electrochemistry.
Acids_and_Bases : BufferWeakWeak (14 Variations)   
(Assessment Material (1))
What mass of potassium bicarbonate (KHCO3) must be added to 500 mL of a 0.200 M carbonic acid solution to make a buffer with pH = 6.30?
Acids_and_Bases : CalcSolnpH (5 Variations)   
(Assessment Material (1))
Use this acid/base table to answer the question below.

Calculate the pH of a {x}M sodium acetate solution.

DO NOT use scientific notation
Enter your answer to two decimal places.
DO NOT enter units

Acids_and_Bases : BufferWeakStrong (7 Variations)   
(Assessment Material (1))
How many mL of a 2.50 M HCl solution must be added to 500 mL of a 0.150 M CO32- solution to make a buffer with pH = 10.00?
Acids_and_Bases : pHBufferCalc (4 Variations)   
(Assessment Material (1))
Calculate the pH of a buffer solution containing {x}M NH3 and {y}M NH4NO3.

Enter your answer to TWO decimal places.
DO NOT use scientific notation.
DO NOT enter units
        eg:     4.55

Acids_and_Bases : pHDilution (6 Variations)   
(Assessment Material (1))
What is the pH of a solution made by diluting {x} mL of {y} M HNO3(aq) to a total volume of 500 mL?

Enter your answer to two decimal places.
DO NOT use scientific notation

Acids_and_Bases : BufferingCapacity (20 Variations)   
(Assessment Material (1))
If a buffer is prepared using 0.75 mol CH3COOH and 0.45 mol CH3COO- in 1 liter of aqueous solution, is the buffering capacity of the solution great enough to maintain its pH if 10 g NaOH is added?
Acids_and_Bases : WeakAcidSolnpH (20 Variations)   
(Assessment Material (1))
Given an aqueous solution of 0.30 M acetic acid (Ka = 1.8 x 10-5), the pH is approximately ...
Acids_and_Bases : WaterAutoIonization (20 Variations)   
(Assessment Material (1))
What effect will the addition of H2CO3 have on the autoionization of water?

Acids_and_Bases : PracticalAcidBase (20 Variations)   
(Assessment Material (1))
Which of the following statements is true?
Acids_and_Bases : LewisAcidBaseRxns (19 Variations)   
(Assessment Material (1))
Identify the Lewis Acid and Base in the reaction of Ag+ and NH3 to form Ag(NH3)2+
Acids_and_Bases : TitrationCurveKaKb (8 Variations)   
(Assessment Material (1))
Study the graph of the titration of a weak acid with a strong base shown below. What is the approximate Ka for this acid?

Acids_and_Bases : PercentDissociationKa (3 Variations)   
(Assessment Material (1))
Calculate the percent dissociation in a {x}M aqueous solution of the weak acid HA. (Ka = {y} x 10-4)

Enter your answer to ONE decimal place.
DO NOT use scientic notation.
DO NOT write in the units.

Acids_and_Bases : AcidicOrBasicSalt (20 Variations)   
(Assessment Material (1))
When dissolved in an aqueous solution, which of the following salts will yield an acidic solution?
Acids_and_Bases : AcidBaseProperties (10 Variations)   
(Assessment Material (1))
Which of the following are properties of HCl?
AcidBaseProducts (10 variations)   
(Assessment Material (1))
The following acid/base table may be useful in answering the question below.

What products will result when HSO4- is added to water? Complete and balance the reaction below.

HSO4- + H2O ?

Acids_and_Bases : ProtonTransferRxn (20 Variations)   
(Assessment Material (1))
Write an equation to describe the proton transfer that occurs when the following acid is added to water: HSO4-
Enter the products in the space below using the following as an example:
What ions are present in an aqueous calcium nitrate solution?
Ca(NO3)2(aq) Ca2+(aq) + 2NO3-(aq)
In this case, the answer would be: Ca2+(aq) + 2NO3-(aq)
You should enter: Ca^(2+) + 2NO3^(-)
In other words, use the ^ to indicate superscripts; put charges in parentheses; and leave a space on either side of the + sign. Your answer must be an exact match for the computer to grade it correctly, so be careful.

What products will result when HSO4- is added to water?

Reactions : IDSampleRxnVideo (7 Variations)   
(Assessment Material (1))
You have an unknown aqueous sample. You add aqueous copper(II) sulfate to the sample. View the video below and determine which of the compounds listed below could be your sample.

Acids_and_Bases : SolnGrams (20 Variations)   
(Assessment Material (1))
How many grams of sodium hydroxide (NaOH) must be dissolved in 510 ml of water to make a solution with a pH = 8.1?
Acids_and_Bases : ChooseIndicator (8 Variations)   
(Assessment Material (1))

A 25.0 mL aliquot of a 1.44M solution of ammonia (Kb = 1.8 x 10-5) is titrated with 1.50M HCl. Use the Indicator Table below to decide which of the indicators listed would most accurately signal the equivalence point for this titration.

Write the letter corresponding to your choice of indicator in the box.

Acids_and_Bases : WeakStrongAcidPics (11 Variations)   
(Assessment Material (1))
Which diagram best represents an aqueous solution of HCl? (Water is not shown.)

Acids_and_Bases : ReactProductFavored (20 Variations)   
(Assessment Material (1))
You may want to use the following acid/base table to answer the question below.

Which of the following reactions will be product -favored?

Acids_and_Bases : IDLewisAcidBase (20 Variations)   
(Assessment Material (1))
Which of the following is a Lewis acid?
Acids_and_Bases : HendersonHassel (20 Variations)   
(Assessment Material (1))
You may want to use the following acid/base table to answer the question below.

Papain is a thiol protease isolated from papaya. The optimal pH for its enzymatic activity is 6.0-7.0. Which of the following buffering systems would work best for a laboratory experiment requiring active papain at pH 6.5? What molar ratios of the compounds would you use to prepare the solution?

Acids_and_Bases : ConjugateAcidBase (20 Variations)   
(Assessment Material (1))
Identify the acid and base that are reactants and the conjugate acid and conjugate base that are products in the following equation:
HI(aq) + H2O(l)  H3O+(aq) + I-(aq)
Acids_and_Bases : MolcScaleAcidBase (10 Variations)   
(Assessment Material (1))
Study the four drawings below and then decide which best represents an aqueous solution that has

(Water molecules are not shown in the diagrams.)

Acids_and_Bases : IonizationSteps (20 Variations)   
(Assessment Material (1))
Citric acid (which is a triprotic acid) has the following structure:

Which of the following equations corresponds to the first ionization step of the acid?
Reactions : ExchangeRxn (10 Variations)   
(Assessment Material (1))
Which of the following compounds would result in an exchange reaction if mixed in an aqueous solution with Ba(OH)2?
Kinetics : ElementRxnRateLaws (13 Variations)   
(Assessment Material (1))
Assume that the equation below represents an elementary reaction. Predict the rate expression (rate law) for this reaction.

CO(g) + Cl2(g) COCl2(g)

Organic : PredictProductEster (10 Variations)   
(Assessment Material (1))
Which ester will be formed by the following reaction?
Kinetics : RxnMechanisms (14 Variations)   
(Assessment Material (1))
Experiments show that the reaction of nitrogen dioxide and carbon monoxide
NO2 + CO NO + CO2

has the following rate expression at high temperatures:

Rate=k[NO2][CO]

Is the following mechanism compatible with the experimental information?
(1) NO2 + CO O-N-O-C-O (slow)
(2) O-N-O-C-O NO + CO2 (fast)
Choose the best answer.

Stoichiometry : SolnStoich (4 Variations)   
(Assessment Material (1))
You are working in a forensic lab and are given a blood sample from a suspected drunk driver and asked to determine the person's blood alcohol level. The legal limit is 0.08% by mass in most states. You use the following reaction in your determination, assuming only the ethanol (C2H5OH) in the blood sample will react with the dichromate.
16H+(aq) + 2Cr2O72-(aq) + C2H5OH(l)4Cr3+(aq) + 11H2(l) + 2CO2(g)

If 14.6 mL of 0.10 M K2Cr2O7 are needed to react completely with 28 g of blood, what is the blood alcohol level of the driver?

Stoichiometry : RxnTable (10 Variations)   
(Assessment Material (1))
Iron reacts with oxygen to form iron(III) oxide according to the following reaction.

4Fe(s) + 3O2(g)2Fe2O3(s)


Fe(s) O2(g) Fe2O3(s)
Initial Amount - - -
Change - - -
End Amount - - -

Complete the reaction table for a reaction mixture containing 12.0 moles of iron and 10.0 moles of oxygen, and select the true statement(s) from following list.

Stoichiometry : GivenMassCalcStMat (10 Variations)   
(Assessment Material (1))
Aspirin is a common analgesic. If you want to produce 250. mg of aspirin (C9H8O4) from the reaction of C7H6O3 and C4H6O3, what is the minimum amount of C7H6O3 that is needed?

2C7H6O3(s) + C4H6O3(l) 2C9H8O4(s) + H2O(l)

Thermodynamics : ATPFromGlucose (8 Variations)   
(Assessment Material (1))
When glucose is oxidized in the human body it releases a lot of Gibbs free energy. Rather than waste this free energy, the body stores much of it in the form of ATP. The following reaction shows this process of storing some of the energy from glucose in ATP. This is an example of coupled reactions in a biological system.

The label on a can of Coke says that it contains 39 g of sugar. Assume that all of the sugar is glucose (even though it isn't), and calculate how many moles of ATP can be produced theoretically by the oxidation of 39.0 g of glucose.
Stoichiometry : RxnMolsProduced (8 Variations)   
(Assessment Material (1))
Given the following balanced chemical reaction:
4A + 3B2 2A2B3
If 12 moles of A are reacted with excess B2, how many moles of A2B3 will be produced?
Very carefully enter the number below.
Stoichiometry : MolsO2ToReactFuel (10 Variations)   
(Assessment Material (1))
Butane can be used as a fuel. How many moles of oxygen are needed to completely react with 3.0 moles of butane?

The unbalanced reaction equation is given below:
C4H10(g) + O2(g) CO2(g) + H2O(g)

Stoichiometry : GivenYieldCalcStMat (4 Variations)   
(Assessment Material (1))
Calcium oxide and water are produced by heating calcium hydroxide. If the reaction has an expected yield of 60%, how much calcium hydroxide should be reacted to produce 115g of calcium oxide?

Ca(OH)2 CaO + H2O

Reactions : BalanceIonEquation (10 Variations)   
(Assessment Material (1))
What is the balanced net ionic equation for the following reaction:

AgNO3(aq) + HCl(aq) AgCl (s) + HNO3(aq)

Stoichiometry : PrecipYield (3 Variations)   
(Assessment Material (1))
In a laboratory experiment to determine accurately the amount of barium in solution, aqueous sulfuric acid was added to the solution to precipitate barium sulfate, which was then filtered and weighed. In this experiment it is MOST important that ...
Stoichiometry : ExplainYldError (4 Variations)   
(Assessment Material (1))
Your TA gives you an aqueous solution containing an unknown quantity of AgNO3(aq) and an unknown quantity of Mg(NO3)2(aq). You are asked to determine the molarity of Ag+ in the solution. You add HCl(aq) to your unknown to precipitate the silver as AgCl(s), then filter out the precipitate, dry it, weigh it, and calculate the concentration of silver ion. However, your TA tells you that your calculated value of [Ag+(aq)] is lower than the actual value. Which of the following could account for your answer being too low? There may be more than one correct answer.
Reactions : PredictRxnProducts (5 Variations)   
(Assessment Material (1))
What are the most likely products from the reaction of aqueous sulfuric acid and aqueous sodium hydroxide?
Reactions : NotRedoxRxn (4 Variations)   
(Assessment Material (1))
Which of the following is a NOT a redox reaction?
Reactions : AcidBaseRxns (20 Variations)   
(Assessment Material (1))
In order to answer the following questions, write the net ionic equation for the reaction between equal volumes of 0.10 M solutions of the following acid and base:

KOH(aq) + HBr(aq)

What are the reaction products? Does the reaction yield an acidic, basic, or neutral aqueous solution?

Reactions : RedoxAgents (10 Variations)   
(Assessment Material (1))
Identify each of the following as a reducing agent or an oxidizing agent.
Matter_and_Measurement : PhysOrChemChange (10 Variations)   
(Assessment Material (1))
Which of the following are physical changes?
Kinetics : IntermediateInMech (15 Variations)   
(Assessment Material (1))
Suppose that for the reaction of nitrogen dioxide and carbon monoxide
NO2 + CO NO + CO2

the following mechanism has been proposed at high temperatures:
(1) NO2 + CO O-N-O-C-O (slow)
(2) O-N-O-C-O NO + CO2 (fast)
Check the box for each species that is an intermediate in this mechanism.

Kinetics : ElementaryRxnOrNot (9 Variations)   
(Assessment Material (1))
Which of the following reactions could be elementary and unimolecular reactions?
Kinetics : InterpretEnergyProfile (16 Variations)   
(Assessment Material (1))
Use the energy profile below to decide if the following statements are true or false.
Stoichiometry : TheorYieldDeviation (10 Variations)   
(Assessment Material (1))
You reacted a known amount of phosphorous triiodide with excess water and determined that the percent yield of phosphoric acid was less than 100%, which of the following statements could explain why?
PI3 + 3H2O H3PO3 + 3HI
Stoichiometry : DeterMolesInRxn (4 Variations)   
(Assessment Material (1))
The reaction of zinc with aqueous hydrochloric acid has the following unbalanced equation

Zn(s) + HCl(aq) ArrowZnCl2(aq) + H2(g)

When 0.1 moles of zinc is reacted with 0.1 moles of hydrochloric acid ...

Stoichiometry : DiagramRxnProds (6 Variations)   
(Assessment Material (1))
According to the law of conservation of matter, which of the following diagrams represents possible products of the following reaction?

A2 + 2B2

Stoichiometry : BalanceRxn (14 Variations)   
(Assessment Material (1))
The reaction of methane with oxygen has the following unbalanced equation

CH4(g) + O2(g) CO2(g) + H2O(l)

The coefficient for oxygen in the balanced equation is ...

Reactions : MetalActivitySeries (10 Variations)   
(Assessment Material (1))
Predict whether the following reaction will occur in aqueous solution.

Zn(ClO3)2(aq) + Ni(s)

Gases : RadicalGasRxns (17 Variations)   
(Assessment Material (1))
Complete the following reaction. (All reactants and products are gases.)
NO2 + NO3
Stoichiometry : RxnNanoPics (4 Variations)   
(Assessment Material (1))
The following diagram shows a compound reacting to form products. Which equation best describes the stoichiometry of the reaction shown in the diagram?

Stoichiometry : GeneralMassMole (4 Variations)   
(Assessment Material (1))
10.0 g of nitrogen monoxide is reacted with 10.0 g of oxygen to form nitrogen dioxide. Which of the following statements is true?
Stoichiometry : EmpirFormulaFromRxn (10 Variations)   
(Assessment Material (1))
When one mole of a diatomic gas, Y2(g), reacts with one mole of hydrogen gas, neither gas is left over. What is the empirical formula of the compound formed?
Reactions : ReactionType (9 Variations)   
(Assessment Material (1))
The reaction Mg + 2HCl MgCl2 + H2 is an example of a(n)
Stoichiometry : NanoPicOfProducts (14 Variations)   
(Assessment Material (1))
The diagram below is representative of a tiny portion of a reaction between ammonia and methane. Which of the diagrams below represents the product mixture?


NH3(g) + CH4(g)HCN(g) + 3H2(g)

Reactions : PredictProducts (10 Variations)   
(Assessment Material (1))
Predict the product(s) of the following displacement reaction.

TiCl4 + 2Mg

Reactions : NanoPicOfProducts (14 Variations)   
(Assessment Material (1))
The diagram below is representative of a tiny portion of a reaction between ammonia and methane. Which of the diagrams below represents the product mixture?


NH3(g) + CH4(g)HCN(g) + 3H2(g)

Reactions : GeneralChemRxn (4 Variations)   
(Assessment Material (1))
In a balanced chemical equation

Check all that apply.

Reactions : GeneralRxnType (10 Variations)   
(Assessment Material (1))
Identify each of the following statements as describing a combination, displacement, decomposition, or exchange reaction.
Air-Solids, Liquids & Gases   
(Activity, Instructional Material (9), (1))
ACS Science for Kids activities explore the properties of gases.
Graphing   
(Activity, Instructional Material (7))
ACS Science for Kids activities explore the aspects of recording scientific data and presenting that data in useful graphs.
Characteristics of Materials   
(Activity, Instructional Material (7), Test, Assessment Material (15))
What makes diapers absorbent? Is peanut butter stickier than syrup or jelly? Strong, stretchy, sticky, or sweet—everything around us has special properties which make them unique. See if you can identify and compare the characteristics of materials.
Toys-ACS Science for Kids   
(Activity, Instructional Material (6))
ACS Science for Kids activities explore how chemistry can be used to make toys.
Chemical & Physical Change   
(Activity, Instructional Material (4), Test, Assessment Material (5))
Everything you see and touch has the ability to change. Sometimes substances change to form new substances. This is called a chemical change. Other times substances change but keep the same identity. This is called a physical change. Try these activities to learn more about chemical and physical change.
Building   
(Activity, Instructional Material (12))
ACS Science for Kids activities exploring the chemistry behind building many everyday objects and structures.
Chemical Reactions   
(Activity, Instructional Material (11))
ACS Science for Kids activities exploring chemical reactions.
Epoxides (5 Variations)   
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A collection of 5 assessment questions about Epoxides
Organometallic (13 Variations)   
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A collection of 13 assessment questions about Organometallic
Oxidation Reduction (21 Variations)   
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A collection of 21 assessment questions about Oxidation Reduction
Amines (30 Variations)   
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A collection of 30 assessment questions about Amines
Acid Base (44 Variations)   
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A collection of 44 assessment questions about Acid Base
Phenols and Aryl Halides (9 Variations)   
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A collection of 9 assessment questions about Phenols and Aryl Halides
Functional Groups (9 Variations)   
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A collection of 9 assessment questions about Functional Groups
Carboxylic Acids (14 Variations)   
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A collection of 14 assessment questions about Carboxylic Acids
Alkanes (22 Variations)   
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A collection of 22 assessment questions about Alkanes
Alcohols and Ethers (22 Variations)   
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A collection of 22 assessment questions about Alcohols and Ethers
Esters (8 Variations)   
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A collection of 8 assessment questions about Esters
Alkenes and Alkynes (31 Variations)   
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A collection of 31 assessment questions about Alkenes and Alkynes
MO Theory (11 Variations)   
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A collection of 11 assessment questions about MO Theory
Sulfur Chemistry (3 Variations)   
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A collection of 3 assessment questions about Sulfur Chemistry
Anhydrides (2 Variations)   
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A collection of 2 assessment questions about Anhydrides
Carbohydrates (17 Variations)   
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A collection of 17 assessment questions about Carbohydrates
Aromatic (26 Variations)   
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A collection of 26 assessment questions about Aromatic
Aldol Reactions (30 Variations)   
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A collection of 30 assessment questions about Aldol Reactions
Aldehyde and Ketone Addition (2 Variations)   
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A collection of 2 assessment questions about Aldehyde and Ketone Addition
Substitution and Elimination (6 Variations)   
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A collection of 6 assessment questions about Substitution and Elimination
Alkenes (16 Variations)   
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A collection of 16 assessment questions about Alkenes
Lipids (2 Variations)   
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A collection of 2 assessment questions about Lipids
Acetals (9 Variations)   
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A collection of 9 assessment questions about Acetals
Radicals (9 Variations)   
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A collection of 9 assessment questions about Radicals
ChemPaths 104 F Feb 25   
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Today in Chem 104: * Lecture: Problem-Solving Session * No assigned reading for today. * Homework #5 due by 11:55 pm Today! * Biomolecules Tutorial Enzymes (including Enzymes Quiz) is due Wed. Mar. 2, at 11:55 pm.
ChemPaths 104 W Feb 23   
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Today in Chem 104: * Lecture: Mechanisms of Reactions * Reading: Kotz, Ch. 15, Sec. 5-6 Moore, Ch. 13, Sec. 6-76 * Homework #5 due by 11:55 pm F Feb 25 * Excel Assignment due in first discussion section this week * Quiz 4 in second discussion section this week