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