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Science 6 Chapter 4 Test Set 1
Test Description: Chemical Reactions
Instructions: Answer all questions to get your test result.
1) Chemistry is
A
the study of matter and how matter changes
B
a characteristic of a substance that can be observed without changing the substance into another substance
C
a rapid reaction between oxygen and a substance called fuel
D
anything that has mass and takes up space
2) The only sure evidence of a chemical reaction is
A
the formation of a gas
B
the production of one or more new substances
C
changes in properties
D
a color change
3) A material used to decrease the rate of a chemical reaction is called a(n)
A
enzyme
B
fuel
C
catalyst
D
inhibitor
4) CaCO₃ represents a chemical
A
formula
B
reaction
C
subscript
D
symbol
5) Which is the correct chemical equation for: Sodium reacts with oxygen to create sodium oxide.
A
2Na + O₂ → 2NaO
B
4Na + O₂ → 2Na₂O
C
Na₂ + O₂ → Na₂O₂
D
Na₂O + O₂ → 2NaO
6) The principle of conservation of mass is true
A
only for reactions that take place in open systems
B
matter is not changed
C
for reactions in both open and closed systems
D
only for reactions that take place in closed systems
7) In chemical reactions, what does the principle of conservation of mass mean?
A
The total mass of the reactants is greater than the total mass of the products
B
Matter is not changed
C
Matter is not created or destroyed
D
The total mass of the reactants is less than the total mass of the products
8) Chemicals that react as biological catalysts by speeding up reactions in living things are called
A
fuels
B
enzymes
C
reactants
D
inhibitors
9) Which of the following is an example of how to supply activation energy to begin a reaction?
A
Heat the reaction flask on a hot plate
B
Add a catalyst
C
Cool the reaction flask in an ice bath
D
Add an inhibitor
10) A bottle of hydrogen peroxide that eventually turns into a bottle of water and oxygen gas is an example of
A
replacement reaction
B
decomposition reaction
C
synthesis reaction
D
precipitate reaction
*select an answer for all questions
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