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7th Grade Unit Chemical Reactions
Test Description: Chemical reactions/chemical equations
Instructions: Answer all questions to get your test result.
1) CaCO3 represents a chemical
A
subscript
B
equation
C
symbol
D
formula
2) Substances that form as a result of a chemical equation are called
A
products
B
catalysts
C
reactants
D
precipitates
3) A bottle of hydrogen peroxide breaks down into water and oxygen gas. This is an example of what kind of reaction?
A
synthesis
B
decomposition
C
closed system
D
replacement
4) Chemicals that act as biological catalysts by speeding up reactions are
A
precipitates
B
enzymes
C
reactants
D
products
5) The ___________ is the amount of one material present in a given volume of another material.
A
precipitate
B
surface area
C
closed system
D
concentration
6) The rate of a chemical reaction is independent of temperature.
A
true
B
false
7) The formula H2SO4 indicates that there are ____ hydrogen atoms, _____ sulfur atoms, and _____ oxygen atoms
A
2 hydrogen, 4 sulfur, 1 oxygen atoms
B
1 hydrogen, 2 sulfur, 4 oxygen atoms
C
2 hydrogen, 2 sulfur, 4 oxygen atoms
D
2 hydrogen, 1 sulfur, 4 oxygen atoms
8) The arrow in a chemical equation represents _____________
A
reactants
B
products
C
prevents
D
yields/produces
9) Physical changes occur when existing bonds break, and new bonds form.
A
false
B
true
10) 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
*select an answer for all questions
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