7th Grade Unit Chemical Reactions Question Preview (ID: 22082)


Chemical Reactions/chemical Equations. TEACHERS: click here for quick copy question ID numbers.

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

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

The formula H2SO4 indicates that there are ____ hydrogen atoms, _____ sulfur atoms, and _____ oxygen atoms
a) 2 hydrogen, 1 sulfur, 4 oxygen atoms
b) 1 hydrogen, 2 sulfur, 4 oxygen atoms
c) 2 hydrogen, 4 sulfur, 1 oxygen atoms
d) 2 hydrogen, 2 sulfur, 4 oxygen atoms

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

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

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

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

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 ______ is made up of only 1 type of atom, while a _______ is made up of 2 or more types of chemically bonded atoms
a) element; compound
b) compound; element
c) element; mixture
d) mixture; compound

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