Chemistry: Matter and Change

Section 1: What is Stoichiometry?

Self Check Quizzes

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 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
3
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
4
How many grams of Fe2O3 are present in 0.82 mol Fe2O3?
A)130 g
B)65 g
C)195 g
D)260 g
5
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)2
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