TIGER

Assessment Questions: 134 results
Atomic_Structure_and_the_Periodic_Table : IonizationEnerTrends (10 Variations)
Which of the following groups of elements is arranged correctly in order of increasing first ionization energy?
Atomic Properties / Structure |
Periodicity / Periodic Table
Electrochemistry : CalcDeltaGfromE (20 Variations)
The following electrochemical data may be helpful in answering the question below.

Calculate the dGo for the oxidation of 2 mole of silver in the following balanced reaction.

2Ag(s) + CaI2(aq) a Ca(s) + 2AgI(s)


Electrochemistry |
Oxidation / Reduction
Electrochemistry : CalcStandRedPotential (20 Variations)
The following electrochemical data may be helpful in answering the question below.

Calculate Eo for the following balanced reaction.

Fe(s) + Fe2(SO3)3(s) Arrow 3FeSO3(s)


Electrochemistry |
Oxidation / Reduction
Electrochemistry : ElectrolysisHalfRxns (20 Variations)
The following electrochemical data may be helpful in answering the question below.

What will be the products of the electrolysis of an aqueous solution of Tin (II) sulfate (SnSO4)? (The electrodes themselves are platinum.)


Electrochemistry |
Oxidation / Reduction |
Electrolytic / Galvanic Cells / Potentials
Electrochemistry : GeneralCorrosion (10 Variations)
Which of the following statements not is true?
Electrochemistry |
Oxidation / Reduction
Electrochemistry : GeneralElectrochem (20 Variations)
Which of the following statements is not correct?
Electrochemistry |
Oxidation / Reduction
Electrochemistry : SacrificialAnode (10 Variations)
The following electrochemical data may be helpful in answering the question below.

One method for protecting metals against corrosion is to connect the metal directly to a "sacrificial anode". This is the method used to protect pipelines and ships hulls. Which of the following metals would you consider the best candidate for a sacrificial anode for a ship's hull? The hull is steel (which is mostly iron).


Electrochemistry |
Oxidation / Reduction |
Metals
Equilibrium : CommonIonEffect (9 Variations)
The molar solubility of lead(II) fluoride (PbF2) is 2.1 x 10-3 mol/L in pure water at 25oC. What is the molar solubility of lead(II) fluoride in 0.10 M NaF at 25oC? (Assume that the only relevant reaction is the solubility-product equilibrium.)
Equilibrium |
Chemometrics
Equilibrium : ConcFromKsp (8 Variations)
The Ksp of BaF2 is 1.7 x 10-6 mol/L in water at 25oC. What is the concentration of barium ions in equilibrium with solid barium fluoride? (Assume that the only relevant reaction is the solubility-product equilibrium.)
Equilibrium |
Chemometrics
Equilibrium : EquilTrueFalse (4 Variations)
Which of the following statements is a true statement concerning a reaction that has reached a state of equilibrium?
Equilibrium
Equilibrium : InterpretKsp (16 Variations)
Which of the following salts would give you the highest concentration of phosphate ions in solution if you placed 1 mole of the salt in a liter of water?
Equilibrium |
Chemometrics
Equilibrium : KspExpressions (10 Variations)
What is the solubility product expression for Ag3PO4?
Equilibrium
Equilibrium : KspSaturation (12 Variations)
Zn(OH)2 has a Ksp of 4.5 x 10-17. If you have a solution of Zn(OH)2 that has a hydroxide ion concentration equal to 4.6 x 10-6 mol/L, the solution is ... (Assume that the only relevant reaction is the solubility-product equilibrium.)
Equilibrium
Gases : GasGramMixPressure (5 Variations)
4.80 g of CH4 is mixed with 17.6 g of CO2 in a 9.00 L flask at a temperature of 67.2oC. What is the total pressure of the flask? (Assume there is no reaction.)
Gases |
Chemometrics
Gases : GasMoleMixPressure (5 Variations)
What is the pressure exerted by a mixture of gases in a 40.0 L container at 127oC if the mixture contains 0.100 mol O2, 0.400 mol CH4, and 0.500 mol SO2?
Gases |
Chemometrics
Gases : GasProperties (9 Variations)
Which of the following is NOT a property of gases?
Gases |
Physical Properties
Gases : GasRxnVolumes (10 Variations)
A gas phase reaction takes place in a syringe at a constant temperature and pressure. If the initial volume before reaction is 30 mL and the final volume after the reaction is complete is 15 mL, which of the following reactions took place? (Note: You can assume that you start with stoichiometric amounts of the reactants, the reaction goes to completion and that the gases behave ideally.)
Gases |
Chemometrics
Gases : IdealGasLaw (11 Variations)
What volume is occupied by 2.60 moles of nitrogen at 1.70 atm and 14.9oC?
Gases |
Chemometrics
Gases : GasLaws (2 Variations)
Note: This is a calculation type question. If you exit the quiz without submitting it and you do not save an answer before exiting the quiz, the values in the question may change when you enter the quiz again.

You purchase a propane tank that can hold gas safely up to a pressure of {x} atm. When the tank contains 100. grams of propane at {y}°C, the gas exerts a pressure of {z}atm. What is the highest temperature to which the propane can be heated safely? (Report your answer in Kelvins.)

Gases |
Chemometrics
Gases : IdealGasMolarMass (10 Variations)
A sealed flask contains 3.1 L of a gas at 2.4 atm and 22.7oC. If the density of the gas is 9.7 g/L, what is its molar mass? (You can assume that the gas behaves ideally.)
Gases |
Chemometrics
Gases : IDGasFromVelocity (8 Variations)
The following are graphs of molecular velocities versus the relative number of molecules for argon, chlorine, methane and xenon at 300K. Which graph is for argon?
Gases |
Molecular Properties / Structure
Gases : KineticMolcThry (7 Variations)
Which postulate of kinetic-molecular theory best accounts for the fact that gases can be compressed easily?
Gases |
Kinetic-Molecular Theory
Gases : OzoneMolcsFromppm (10 Variations)
Although ozone is an important component of the upper atmosphere, long-term exposure to ozone in the air we breathe can cause inflammation of the lung, impairment of lung defense mechanisms, and irreversible changes in lung structure. The EPA has set an 8 hour limit for ozone of 0.08 ppm as an air quality standard for cities. At the EPA limit, how many ozone molecules are present in 5.0 liters of air at 25oC and 0.967 atm? (Hint: assume that air is an ideal gas and calculate the total number of molecules there are in 5.0 L. Then use the definition of ppm.)
Gases |
Chemometrics
Gases : RealGases (6 Variations)
Which gas in the following list will have the greatest deviation from ideal behavior at STP?
Gases |
Molecular Properties / Structure
Gases : VolGasReactInTorch (10 Variations)
Oxyacetylene torches used in high-temperature welding use a combination of oxygen and acetylene. The combustion of acetylene (C2H2) occurs in these torches. What volume of oxygen is needed to react with 250 mL of acetylene?
Gases |
Stoichiometry
Kinetics : ConcVsTimeGraph (8 Variations)
The following graph shows the change in concentration as a function of time for the reaction:
2NO2(g) + F2(g) 2NO2F(g)
What do each of the curves A, B, and C represent?

Kinetics
Kinetics : Enzyme (7 Variations)
Trypsin assists in digestion by breaking proteins down into smaller peptides. However, this process is not as efficient in the presence of fluorophosphates. Identify the role of each of these components.
Enzymes |
Kinetics
Kinetics : InterpretEnergyProfile (16 Variations)
Use the energy profile below to decide if the following statements are true or false.

Kinetics |
Mechanisms of Reactions
Kinetics : RateConstantUnits (8 Variations)
The isomerization of CH3NC to CH3CN has a rate constant of 0.46 s-1 at 600 K.

(1) Based on the units of the rate constant, what is the order of the reaction? {1:MULTICHOICE:zero-order#No, that is not correct.~=first-order#Correct!~second-order#No, that is not correct.~third-order#No, that is not correct.}

(2) What is the concentration of CH3CN after 0.20 minutes of reaction if the initial concentration is 0.10 M? {1:NUMERICAL:=4e-4:1e-5#Correct!~%50%4e-4:5e-5#Close, but not quite.}(Do not include units!)


Kinetics |
Rate Law
Kinetics : ArrheniusActEnergy (4 Variations)
The rate constant for the first-order dehydration of tert-butyl alcohol at 500oC is 1.20 x 10 -4 s -1. The rate constant for this process at 600oC is 6.80 x 10 -3 s -1. Calculate the activation energy for this reaction in kJ/mol. (R = 8.314 J/mol K)
Kinetics |
Chemometrics
Kinetics : ArrheniusRateConst (4 Variations)
CH3CH2NO2 C2H2 + HNO2

Using the graph below, calculate the rate constant for this reaction at 40.0oC.

Kinetics |
Chemometrics
Kinetics : ArrheniusTemp (3 Variations)
The activation energy for the isomerization of cyclopropane to propene is 274 kJ/mol. By what factor does the rate of reaction increase as the temperature rises from 500oC to 550oC assuming all else remains constant? (R = 8.314 J/mol k)

Hint: This is asking for the ratio of rates which is proportional to the ratio of the rate constants, all else being equal.


Kinetics |
Chemometrics
Kinetics : CatalystTrueFalse (7 Variations)
Check the box for each statement about catalysts that is true.
Kinetics |
Catalysis
Kinetics : CatalyticConverters (4 Variations)
The following table illustrates the changes in emissions requirements for automobiles:
Pollutant1970 Emissions1990 EmissionsCA ultra-low emissions
CxHy1.5 g/mile0.25 g/mile0.04 g/mile
CO15 g/mile3.4 g/mile1.7 g/mile
NOx3.1 g/mile0.4 g/mile0.2 g/mile
Catalytic converters are used in automobiles to convert pollutants in engine emissions to benign products. Catalytic converters in today's automobiles are made of a porous ceramic brick that has been coated with catalysts, additives, stabilizers, and support materials. Corning has developed bricks that have very thin-walled channels with 600 channels per square inch. Which of the following research goals did they target?

Kinetics |
Catalysis
Kinetics : ElementaryRxnOrNot (9 Variations)
Which of the following reactions could be elementary and unimolecular reactions?
Kinetics |
Mechanisms of Reactions
Kinetics : IntermediateInMech (15 Variations)
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 |
Mechanisms of Reactions
Kinetics : RateLawChangeConc (10 Variations)
The rate law for a reaction is rate=k[A][B]. If the concentration of A doubles, the rate of the reaction will do which of the following?
Kinetics |
Rate Law
Kinetics : RxnMechanisms (14 Variations)
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.


Kinetics |
Mechanisms of Reactions |
Rate Law
Matter_and_Measurement : ElemCompdMix (10 Variations)
Classify each of the following as an element, compound, or mixture.
Molecular Properties / Structure
Matter_and_Measurement : ElementState (10 Variations)
Identify how each of the following elements exist under normal conditions.
Phases / Phase Transitions / Diagrams
Matter_and_Measurement : HomoOrHeteroMix (10 Variations)
Identify the following as homogeneous or heterogeneous mixtures.
Molecular Properties / Structure
Matter_and_Measurement : ThryOrHypothesis (6 Variations)
Identify each of the following statements as a theory or a hypothesis.
Molecular Properties / Structure
Matter_and_Measurement : CalcDensity (5 Variations)
What is the density of a 7000 gram brick that is 4 inches x 5 inches x 3 inches?
Physical Properties |
Solids
Matter_and_Measurement : ClassifyMatter (8 Variations)
Which of the following descriptions best classifies aluminum foil?
Molecular Properties / Structure
Matter_and_Measurement : CompareFCTemps (10 Variations)
Which is the higher temperature, 350oC or 350oF?
Chemometrics |
Nomenclature / Units / Symbols
Matter_and_Measurement : ConvertUnits (10 Variations)
Your textbook is approximately 8.75 inches by 10.25 inches. What are these measurements in centimeters?
Chemometrics |
Nomenclature / Units / Symbols
Matter_and_Measurement : ElementType (10 Variations)
Which of the following are metals?
Periodicity / Periodic Table
Matter_and_Measurement : NanoScalePhases (8 Variations)
Which of the following contains the most active particles?
Kinetic-Molecular Theory
Matter_and_Measurement : NumOfSigFigs (4 Variations)
How many significant figures will the answer to the following problem contain?

Chemometrics
Matter_and_Measurement : PhaseProperties (10 Variations)
Does the following statement apply to solids, liquids, or gases?
It has a fixed volume.

Phases / Phase Transitions / Diagrams
Matter_and_Measurement : PhysOrChemChange (10 Variations)
Which of the following are physical changes?
Physical Properties |
Reactions
Matter_and_Measurement : QualQuantObserv (10 Variations)
Which of the following statements are quantitative observations about carbon?
Physical Properties
Matter_and_Measurement : UseDensity (10 Variations)
If a 10.0 inch aluminum skillet weighs 3 pounds, how many cm3 of aluminum does it contain? The density of aluminum is 2.70 g/cm3.

Physical Properties |
Solids |
Chemometrics
Molecular_Structure : MolecularGeometry (23 Variations)
Which of the following molecules/ions have a linear molecular geometry like the structure shown below?

Be patient. It may take a while for the structure to load.



Covalent Bonding |
VSEPR Theory
Molecular_Structure : AtomFromGeometry (8 Variations)
Which atom or atoms could be the central atom, X, in the stable molecule XH3 with one lone pair of electrons?
Atomic Properties / Structure |
Periodicity / Periodic Table
Molecular_Structure : BondAngle (6 Variations)
Which of the following has the smallest H-X-H bond angle?
Covalent Bonding |
VSEPR Theory
Molecular_Structure : ElectronPairGeometry (20 Variations)
Which of the molecules/ions below have a linear electron-pair geometry?
Covalent Bonding |
VSEPR Theory
Molecular_Structure : Hybridization (10 Variations)
Which of the following molecules/ions have sp hybridization around the indicated atom?
Covalent Bonding |
MO Theory
Molecular_Structure : IDNonpolarMolc (10 Variations)
Which of the following molecules is nonpolar?
Covalent Bonding |
VSEPR Theory
Organic : AlcoholClassification (10 Variations)
Match the following alcohols to the proper classification. (You may not need to use all of the classifications.)
Alcohols |
Nomenclature / Units / Symbols
Organic : AlcoholOxidation (10 Variations)
Which of the following alcohols will be oxidized by potassium permanganate to form a ketone?
Alcohols |
Oxidation / Reduction
Organic : AlkaneIsomers (8 Variations)
Pentane has several isomers. Which of the following condensed formulas is NOT an isomer of pentane?
Alkanes / Cycloalkanes |
Constitutional Isomers
Organic : AlkaneNomenclature (10 Variations)
What is the correct name for the following compound:
CH3CH2CH2CH3

Alkanes / Cycloalkanes |
Nomenclature / Units / Symbols
Organic : CisTransPossible (20 Variations)
Which of the following molecules can have cis and trans isomers? (You may select more than one.)
Alkenes |
Stereochemistry
Organic : FindIdenticalIsomers (20 Variations)
Which of the following structural isomers for C6H14 are actually the same structure?
Alkanes / Cycloalkanes |
Alkenes |
Constitutional Isomers
Organic : FunctionalGroups (18 Variations)
The structure for niacin (one of the B-vitamins) is shown below. Which of the following functional groups is present in niacin?

Alcohols |
Aldehydes / Ketones |
Carboxylic Acids |
Esters |
Amines / Ammonium Compounds
Organic : HsOnAlkaneBackbone (10 Variations)

The carbon skeleton for 2-methylbutane is shown below. How many hydrogens are present?

Alkanes / Cycloalkanes |
Molecular Properties / Structure
Reactions : GeneralRxnType (10 Variations)
Identify each of the following statements as describing a combination, displacement, decomposition, or exchange reaction.
Reactions
Reactions : RedoxAgents (10 Variations)
Identify each of the following as a reducing agent or an oxidizing agent.
Oxidation / Reduction |
Reactions
Reactions : AcidBaseRxns (20 Variations)
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?


Acids / Bases |
Reactions |
pH
Reactions : ExchangeRxn (10 Variations)
Which of the following compounds would result in an exchange reaction if mixed in an aqueous solution with Ba(OH)2?
Aqueous Solution Chemistry |
Reactions |
Precipitation / Solubility
Reactions : GeneralChemRxn (4 Variations)
In a balanced chemical equation

Check all that apply.


Reactions
Reactions : HighOxNumber (10 Variations)
In which of the following does sulfur have the highest oxidation number?
Atomic Properties / Structure |
Periodicity / Periodic Table |
Molecular Properties / Structure
Reactions : IDOxidationNumber (10 Variations)
What is the oxidation number of sulfur in barium sulfate (BaSO4)?
Atomic Properties / Structure |
Periodicity / Periodic Table |
Molecular Properties / Structure
Reactions : NanoPicOfProducts (14 Variations)
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
Reactions : NotRedoxRxn (4 Variations)
Which of the following is a NOT a redox reaction?
Oxidation / Reduction |
Reactions
Reactions : PredictProducts (10 Variations)
Predict the product(s) of the following displacement reaction.

TiCl4 + 2Mg


Reactions
Reactions : PredictRxnProducts (5 Variations)
What are the most likely products from the reaction of aqueous sulfuric acid and aqueous sodium hydroxide?
Aqueous Solution Chemistry |
Reactions
Reactions : Solubility (8 Variations)
Which of the following compounds are soluble in water?
Aqueous Solution Chemistry |
Precipitation / Solubility
Reactions : StrongWeakAcidBase (10 Variations)
Which of the following are strong acids?
Acids / Bases
Reactions : WillSolnConduct (5 Variations)
One gram of each of the following compounds is mixed with 100mL of water. Which will form solutions that will conduct electricity?
Aqueous Solution Chemistry
Solutions : ConvertConcUnits (10 Variations)
The maximum concentration of arsenic in drinking water that is allowed by the EPA is 0.050 mg/L. Express this as a weight percent. (You can assume the density of the water solution is 1.0g/mL.)
Solutions / Solvents |
Nomenclature / Units / Symbols |
Chemometrics
Solutions : FreezePtDepression (20 Variations)
It takes 6.86 kg of ethylene glycol (antifreeze) to decrease the freezing point of 6.50 kg of water to -25.0oF (-31.7oC). How much sodium chloride (NaCl) would it take to decrease the freezing point of 6.50 kg of water to -25.0oF? (Assuming all the salt will dissolve in that amount of water.)
Solutions / Solvents
Solutions : GeneralSolutions (10 Variations)
You have 500.0mL of 0.100M aqueous MgBr2. Which of the following statements are true?
Solutions / Solvents
Solutions : GeneralSurfactants (20 Variations)
You can make homemade soap by combining a fat (tallow, lard, vegetable oil, etc.) with a source of alkali (lye). What is the purpose of the fat in soap?
Micelles
Solutions : GramsToMolalSoln (20 Variations)
How many grams of citric acid need to be added to 750 ml of ethanol to make a 0.50 m solution?

Density (g/ml)

Molecular Weight (g/mol)

Citric acid

1.665

192.14

Ethanol

0.7893

46.07


Solutions / Solvents |
Nomenclature / Units / Symbols |
Chemometrics
Solutions : IDColloidType (20 Variations)
What type of colloid is pigmented plastic?
Colloids
Solutions : IonConcentration (4 Variations)
Which of the following solutions has the greatest concentration of Na+ ions?
Solutions / Solvents |
Chemometrics
Solutions : MassSoluteInSoln (10 Variations)
What is the mass of the solute in 500mL of 0.341M ammonium chloride?
Solutions / Solvents |
Chemometrics
Solutions : MixturesMolcPics (11 Variations)
Which of the following combinations of substances corresponds to the molecular scale diagram shown below?

Solutions / Solvents |
Noncovalent Interactions |
Precipitation / Solubility
Solutions : RelativeConc (4 Variations)
What are the relative concentrations of the ions in 0.10 M aqueous sulfuric acid?
Solutions / Solvents |
Stoichiometry
Solutions : ReverseOsmosis (20 Variations)
You are given a water sample that contains ammonium chloride (NH4Cl). You determine the concentration of the salt to be 0.500 M and decide to purify the water using reverse osmosis. What is the minimum pressure that must be applied at 30.0oC to force the water through the membrane?
Solutions / Solvents |
Transport Properties
Solutions : SolnConcAfterMixing (4 Variations)
10 mL of 0.1 M BaCl2(aq) is mixed with 10 mL of 0.1 M AgNO3(aq). What are the concentrations of the ions in the final mixture?
Solutions / Solvents |
Chemometrics
Solutions : SolnPrepByDilution (10 Variations)
For the analysis of trace metals it is necessary to prepare solutions of very low concentrations from a stock solution of higher concentration using a micropipet and a volumetric flask. What volume of a 0.0010 M solution of Zn(NO3)2 (aq) would be required to prepare a 5.0 nM solution of Zn2+ in a 250mL flask?
Solutions / Solvents |
Chemometrics
Solutions : SolnPrepByMass (4 Variations)
You are required to prepare 5 L of a solution containing 1.000 x 10-3 mol/L of Cu2+(aq). Which of the following procedures would produce an appropriate solution?
Solutions / Solvents |
Chemometrics
Solutions : SolnPrepProcedure (10 Variations)
You want to prepare 250mL of a 0.0150M solution of KCl. Which of the following procedures would give you the best results?
Solutions / Solvents
Solutions : SolutionNanoPics (4 Variations)
The drawings below represent flasks of aqueous solutions. Each pink dot represents a dissolved solute particle.
Which of the following solutions is most concentrated?

500 mL
Solution A
500 mL
Solution B
500 mL
Solution C
250 mL
Solution D
250 mL
Solution E
250 mL
Solution F


Solutions / Solvents
Solutions : WtPercentToMolarity (4 Variations)
A common concentration unit used commercially is percent weight per volume (%W/V) which is the number of grams of solute in 100 mL of solution. A bottle of vinegar contains 5 %W/V acetic acid (CH3COOH). What is the molar concentration of acetic acid in the vinegar?
Solutions / Solvents |
Nomenclature / Units / Symbols |
Chemometrics
Special_Topics : BiopolyFromMonomer (20 Variations)
Match each of the following biomolecules to the type of biopolymer it will form.
Polymerization
Special_Topics : AirPollutants (20 Variations)
Which of the following air pollutants can be described as a photochemically active free radical that contributes to acid rain and respiratory irritation?
Atmospheric Chemistry
Special_Topics : Copolymerization (20 Variations)
Identify the polymer produced from the polymerization of glycolic acid.

Polymerization
Special_Topics : GeneralAcidRain (20 Variations)
Which of the following statements about acid rain is the most correct?
Atmospheric Chemistry
Special_Topics : RainFallpH (20 Variations)
The rainfall in central Wisconsin has a pH of 4.8 (National Atmospheric Deposition Program). Take a look at the EPA webpage Effects of Acid Rain: Lakes & Streams. This site has a chart of the pH at which several aquatic species begin to suffer. Determine which of the following species will be most affected by rainfall of this acidity if the lakes and streams in central Wisconsin aren't buffered enough to neutralize some of the acid. (There may be more than one correct answer.)
Atmospheric Chemistry
Special_Topics : GeneralFuel (6 Variations)
Which of the following statements is not accurate?
Applications of Chemistry
Special_Topics : GeneralOzone (17 Variations)
Which of the following statements is not an accurate description of the roles ozone plays in the atmosphere?
Atmospheric Chemistry
Special_Topics : OzoneDepletion (8 Variations)
Use the EPA Web site to answer the following question.

Which of the following ozone depleting compounds would be the least harmful substance to the ozone layer?


Atmospheric Chemistry
Special_Topics : IDMonomerFromPoly (20 Variations)
Identify the monomer used to produce the following polymer.

Polymerization
Special_Topics : OctaneRating (10 Variations)
Which of the following compounds is least helpful in preventing engine knocking in an automobile?
Applications of Chemistry
Special_Topics : PlasticRecycling (20 Variations)
Which of the following statements is not one of the reasons usually given in support of recycling plastics?
Polymerization |
Applications of Chemistry
Special_Topics : SmogFormation (20 Variations)
In which of the following scenarios is the formation of photochemical smog most likely?
Atmospheric Chemistry
Stoichiometry : AtomsAndGrams (10 Variations)
How many moles of atoms does a 500. g bar of gold contain?
Stoichiometry |
Nomenclature / Units / Symbols
Stoichiometry : CalcPercentYield (8 Variations)
When copper is heated in air, copper(II) oxide is formed. In a given experiment, 1.50 g copper was heated to yield 1.76 g copper(II) oxide. What is the percent yield?
Stoichiometry |
Chemometrics
Stoichiometry : CalcWeightPercent (8 Variations)
What is the weight percent of oxygen in LiHCO3?
Stoichiometry |
Chemometrics
Stoichiometry : CombustionAnalysis (10 Variations)
While working in the lab, you find a bottle of white powder labeled "analgesic compound #5". Since the original investigator neglected to record the identity of the substance, you decide to perform a combustion analysis to identify the compound. You have a 65.7 g sample that when burned produces 182 g CO2 and 51.7 g H2O. What is the formula of this compound? (The compound only consists of C,H, and O.)
Stoichiometry |
Molecular Properties / Structure
Stoichiometry : CompareParticles (20 Variations)
Which has the greater number of particles, 1 mol O2 or 1 mol O?
Molecular Properties / Structure |
Atomic Properties / Structure
Stoichiometry : EmpirFormulaFromRxn (10 Variations)
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?
Stoichiometry |
Reactions
Stoichiometry : ExplainYldError (4 Variations)
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.
Stoichiometry |
Reactions |
Chemometrics
Stoichiometry : FormulaFromComp (8 Variations)
Lactic acid is the substance that makes your muscles burn when you've been exercising hard. Lactic acid is composed of 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by weight. If it has a molar mass of 90 g/mol, what is its molecular formula?
Stoichiometry |
Molecular Properties / Structure
Stoichiometry : GeneralMassMole (4 Variations)
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 |
Reactions
Stoichiometry : GramMoleProblem (9 Variations)
Which sample contains the largest number of nitrogen atoms?
Stoichiometry
Stoichiometry : PrecipYield (3 Variations)
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 |
Reactions |
Chemometrics
Stoichiometry : RxnNanoPics (4 Variations)
The following diagram shows a compound reacting to form products. Which equation best describes the stoichiometry of the reaction shown in the diagram?


Stoichiometry |
Reactions
Stoichiometry : StoicNeeds (10 Variations)
You have a known mass of a compound X and react it to form compound Y. What is the minimum information you need to find the mass of Y produced?
Stoichiometry
Thermochemistry : SystemSurrExoEndo (4 Variations)
Sulfuric acid is added to water in a beaker and the resulting solution is much warmer than either the water or acid was initially.
Identify the following items as being part of the system or the surroundings, and indicate whether the process is exothermic or endothermic.

Calorimetry / Thermochemistry
Thermochemistry : BombCalorimeter (4 Variations)
Stearic acid (CH3(CH2)16CO2H) is a fatty acid, the part of fat that stores most of the energy. 1.00 g of stearic acid was burned in a bomb calorimeter. The bomb had a heat capacity of 652 J/oC and a 500. g water reservoir. If the temperature rose from 25.0 to 39.3 oC, how much heat was released when the stearic acid was burned?
Calorimetry / Thermochemistry |
Chemometrics
Thermochemistry : BondEnergies (10 Variations)
Use to determine which of the following requires the most energy.
Calorimetry / Thermochemistry
Thermochemistry : CalcHStateChange (4 Variations)
Calculate the enthalpy change when 100. g of ice at 0.0 oC is heated to liquid water at 50.0oC. (The heat of fusion for water is 333 J/g.)
Calorimetry / Thermochemistry |
Chemometrics
Thermochemistry : ConvertEnergyUnits (4 Variations)
The label on a granola bar says it provides 120 Calories. How many kilojoules of energy will this bar provide if it is completely metabolized?
Calorimetry / Thermochemistry |
Nomenclature / Units / Symbols
Thermochemistry : FlaskTemp (6 Variations)
If 200. J of thermal energy was added to both flasks, which of the following would happen?

Calorimetry / Thermochemistry
Thermochemistry : CoffeeCupCalorimeter (2 Variations)
A block of copper is heated to {x} °C and then is dropped into a coffee cup calorimeter containing {y} g of water at 25.0 °C. The final temperature of the system is 45.1 °C. What is the mass of the copper block to the nearest gram? (Assume all heat is transferred to the water). Write your answer in the box, and do NOT include units.

Specific heat capacity of copper = 0.383 J/(g*°C)

Specific heat capacity of water = 4.18 J/(g*°C)

Calorimetry / Thermochemistry |
Chemometrics
Thermochemistry : FuelAmpWattHeat (4 Variations)
Gasoline has an enthalpy of combustion of approximately 24000 kJ/gallon. When gasoline burns in an automobile engine, approximately 30% of the energy released is used to produce mechanical work. The remainder is lost as heat transfer to the engine's cooling system and eventually the atmosphere. As a start on estimating how much heat transfer is required, calculate what mass of water could be heated from 25 to 100oC by the combustion of 1.0 gallon of gasoline in an automobile.
Calorimetry / Thermochemistry |
Chemometrics
Thermochemistry : GeneralEnergy (10 Variations)
Which of the following statements about energy is NOT true?
Calorimetry / Thermochemistry
Thermochemistry : HeatCapacityGraph (6 Variations)

Consider the graph above. Which of these substances has the highest specific heat capacity?


Calorimetry / Thermochemistry |
Heat Capacity
Thermochemistry : HeatCapacityLiq (4 Variations)
100 g of water (c=4.184 J/g.oC), 100 g of ethanol (c=2.46 J/g.oC), 100 g of carbon tetrachloride (c=0.861 J/g.oC), and 100 g of ethylene glycol (c=2.42 J/g.oC) at 50oC were each placed into a separate coffee cup calorimeter and the temperature recorded. The temperature of the surroundings was 20oC. After one hour the temperature of which substance would have changed by the largest amount? Assume that the rate of heat transfer from the coffee cup to the surroundings was the same in each case.
Calorimetry / Thermochemistry |
Heat Capacity