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Assessment Questions: 34 results

Stoichiometry : DeterMolesInRxn (4 Variations)
The reaction of zinc with aqueous hydrochloric acid has the following unbalanced equation

Zn(s) + HCl(aq) ZnCl₂(aq) + H₂(g)

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

Stoichiometry |

Reactions

Stoichiometry : MolsO2ToReactFuel (10 Variations)
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 |

Reactions |

Chemometrics

Stoichiometry : BalanceRxn (14 Variations)
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 ...

Stoichiometry |

Reactions

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 : GivenYieldCalcStMat (4 Variations)
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

Stoichiometry |

Reactions |

Chemometrics

Stoichiometry : GivenMassCalcStMat (10 Variations)
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)

Stoichiometry |

Reactions |

Chemometrics

Stoichiometry : GramMoleProblem (9 Variations)
Which sample contains the largest number of nitrogen atoms?

Stoichiometry

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

Atoms,_Molecules_and_Ions : MassInAlloy (10 Variations)
Gold is alloyed with other metals to make it less malleable. 10 karat gold is an alloy that is 41.7% gold. How much pure gold is in a 20. gram 10 karat gold ring?

Stoichiometry

Stoichiometry : LimitingReagent (8 Variations)
The synthesis of urea by Frederich W??hler in 1825 began the decline of the idea that "organic" chemicals could only be made by living organisms as part of their biological processes.

AgOCN(aq) + NH₄Cl(aq)AgCl(s) + NH₂CONH₂(aq)

If you perform this reaction and collect the following table of data, in which trial(s) is AgOCN clearly the limiting reactant?

Trial	AgOCN used	NH₄Cl	AgCl produced
1	20.4 mL	5.3 mL	2.4 g
2	20.3 mL	10.4 mL	4.3 g
3	20.6 mL	15.4 mL	6.2 g
4	20.5 mL	20.6 mL	8.2 g
5	20.4 mL	25.2 mL	10.2 g
6	20.3 mL	30.4 mL	10.3 g

The mL of AgOCN and NH₄Cl are the initial amounts used, the mass of AgCl is how much was recovered from the reaction. (Hint: You do not need to do any calculations to answer this question.)

Stoichiometry

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

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

A₂ + 2B₂

Stoichiometry |

Reactions

Stoichiometry : CalcTheorYield (10 Variations)
If you react 6.2g of phosphine with 8.30g of oxygen, what is the theoretical yield of phosphorous pentaoxide?

4PH₃ + 8O₂ P₄O₁₀ + 6H₂O

Stoichiometry |

Chemometrics

Stoichiometry : TheorYieldDeviation (10 Variations)
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 |

Reactions

Stoichiometry : CalcWtPercent (6 Variations)
A standard dose of antacid as a calcium supplement is two tablets. The active ingredient in many of these tablets is calcium carbonate. One tablet, having a weight of 1.415 g, is reacted with excess HCl(aq) to produce 0.22 g CO₂. What is the weight percent of calcium in this tablet?

CaCO₃(s) + 2HCl(aq)CaCl₂(aq) + H₂O(l) + CO₂(g)

Stoichiometry |

Chemometrics

Stoichiometry : CalcPercentPurity (4 Variations)
To test the purity of calcium sulfate, you dissolve a 4.56g sample in water and add oxalic acid to precipitate out calcium oxalate. If 3.45g of precipitate forms, what is the percent purity of the calcium sulfate?

CaSO₄(aq) + H₂C₂O₄(aq) CaC₂O₄(s) + H₂SO₄(aq)

Stoichiometry |

Chemometrics

Solutions : RelativeConc (4 Variations)
What are the relative concentrations of the ions in 0.10 M aqueous sulfuric acid?

Solutions / Solvents |

Stoichiometry

Stoichiometry : AtomsAndGrams (10 Variations)
How many moles of atoms does a 500. g bar of gold contain?

Stoichiometry |

Nomenclature / Units / Symbols

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 : 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 : 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

Bonding : DetermineStructure (8 Variations)
H A substance is analyzed and found to contain 57.10% carbon, 4.80% hydrogen and 38.06% oxygen by weight. Its molecular weight is determined to be 126.11 g/mol. Which of the structures shown are possible structures for the substance?