7th Grade Unit Chemical Reactions Question Preview (ID: 22082)
Chemical Reactions/chemical Equations.
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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
c)
d)
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 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
c)
d)
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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