Chapter 5 Test - Chemical Reactions: Question Preview (ID: 22082)

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CaCO3 represents a chemical
a) formula
b) equation
c) symbol
d) subscript

Substances that form as a result of a chemical equation are called
a) products
b) reactants
c) precipitates
d) catalysts

A bottle of hydrogen peroxide breaks down into water and oxygen gas. This is an example of what kind of reaction?
a) decomposition
b) synthesis
c) replacement
d) closed system

Chemicals that act as biological catalysts by speeding up reactions are
a) enzymes
b) precipitates
c) reactants
d) products

The ___________ is the amount of one material present in a given volume of another material.
a) concentration
b) surface area
c) precipitate
d) closed system

The rate of a chemical reaction is independent of temperature.
a) false
b) true

The _______________ is the minimum amount of energy that must be added to start a chemical reaction.
a) activation energy
b) chemical energy
c) solar energy
d) synthesis energy

The arrow in a chemical equation represents _____________
a) yields/produces
b) products
c) reactants
d) prevents

Physical changes occur when existing bonds break, and new bonds form.
a) false
b) true

A reaction in which one element replaces another in a compound or two elements in different compounds trade places is called a __________ reaction.
a) replacement
b) synthesis
c) decomposition
d) reactant

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