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)