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Section 1: What is Stoichiometry?

What is stoichiometry?

1.
What is the scientific law that states that matter is not created or destroyed but only transformed in a chemical reaction?
A)law of conservation of energy
B)law of conservation of mass
C)law of conservation of momentum
D)law of gravity
2.
What is the first thing you must do to solve a stoichiometric problem?
A)Find the limiting reactant.
B)Find the excess reactant.
C)Write a balanced chemical equation.
D)Find the empirical formula.
3.
What do the coefficients in the following balanced chemical equation mean?
2H2 + O2 → 2H2O
A)2 moles of hydrogen and 1 mole of oxygen in the reactants
B)2 moles of oxygen and 1 mole of hydrogen in the reactants
C)2 moles of oxygen and 1 mole of hydrogen in the products
D)2 moles of hydrogen and 1 mole of oxygen in the products
4.
What is the ratio between the coefficients of any two substances in a balanced equation?
A)molar mass balanced equation
B)mole ratio
C)quadratic equation
D)chemical formula
5.
What is the balanced chemical equation for the reaction between hydrochloric acid and calcium carbonate when the products of the reaction are calcium chloride, carbon dioxide, and water?
A)HCl + CaCl2 → CaCO3 + CO2 + H2O
B)HCl + CaCO3 → CaCl2 + CO2 + H2O
C)2HCl + CaCO3 → CaCl2 + CO2 + H2O
D)2HCl + CaCl2 → CaCO3 + CO2 + 2H2O
6.
How many moles of CO2 would be produced from 56 moles of O2 according to the following balanced equation?
2C2H6 + 7O2 → 4CO2 + 6H2O
A)16 mol
B)32 mol
C)224 mol
D)48 mol
7.
How many grams of Fe2O3 are present in 0.82 mol Fe2O3?
A)130 g
B)65 g
C)195 g
D)260 g
8.
How many grams of O2 are required to burn 18 g C5H12?
C5H12 + 8O2 → 5CO2 + 6H2O
A)16 g
B)32 g
C)64 g
D)80 g
9.
Balance the following equation with the smallest whole-number coefficients. What is the coefficient for H2O in this equation?
PBr3 + H2O → H3PO3 + HBr
A)2
B)3
C)4
D)1
10.
Balance the following equation with the smallest whole—number coefficients. How many moles of Ag2S can be prepared from 3 moles of Ag?
Ag + H2S + O2 → Ag2S + H2O
A)1.0 mol
B)1.5 mol
C)2.0 mol
D)4.0 mol
11.
Balance the following equation with the smallest whole—number coefficients. What is the coefficient for O2 in the balanced equation?
C5H10 + O2 → CO2 + H2O
A)5
B)10
C)15
D)20
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