Chapter 8 and 9 Test Multiple Choice

Which coefficents correctly balance the formula equation NH4NO2-------> N2 + H2O

1,1,2

When the equation Fe3O4+Al----->Al2O3 is correctly balanced, what is the coefficient of Fe?

9

In what kind of reaction does a single compound produce two or more simplier substances?

Decomposition

The reaction represented by the equation Pb(NO3)2+2KI---->PbI2+2KNO3 is a

Double Replacemnet

In writing a chemical equation that produces hydrogen gas, the correct representation of hydrogen gas is

H2

The mass of one mole of a substance is defined as its

Molar Mass

Each of the four types of reaction stoichiometry problems requires using a

Mole ratio

What is the ratio of actual yield to the theroretical yield, multiplied by 100%?

Percentage Yield

What is the study of the mass relationships among reactants and products in a chemical reaction?

Reaction Stoichiometry

In what kind of reaction do two or more substances combine to form a new compound?

Synthesis

When a solid is produced from the reaction of two solutions, it is referred to as

a precipitate

What is the small whole number that appears in the front of a formula in a chemical equation?

coefficent

To balance a chemical equation, it may be neccessary to adjust the the

coefficents

A chemical reaction involving substances A and B stops when B is completely used. A is the

excess reactant

Which observation(s) indicate that a chemical reaction has occurred?

formation of a precipitate, production of a gas, and evolution of heat and light

In most chemical reactions the amount of product obtained is

less than the theoretical yield

A balanced chemical equation allows one to determine the

mole ratio of any two substances in the reaction

If the percentage yield is equal to 100%, then...

the actual yield is equal to the theoretical

In a chemical reaction

the mass of the reactants equals the mass of the products

In an equation, the symbol for a substance in water solution is followed by

(aq)