
Ch. 5 Physical Science Test
Quiz
•
Physics
•
8th Grade
•
Medium
Rebekah Marousek
Used 1+ times
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15 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The only sure evidence for a chemical reaction is
the formation of a gas.
a color change
the production of one or more
changes in properties
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A material used to decrease the rate of a chemical reaction is a(n)
inhibitor
catalyst
enzyme
fuel
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A material used to decrease the rate of a chemical reaction is a(n)
symbol
formula
subscript
reaction
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which is the correct chemical equation for the following statement?
Sodium reacts with oxygen in a 2 to 1 ratio to produce sodium oxide.
4 Na + O2 2 yields Na2O
2 Na + O2 yields 2 NaO
Na2O + O2 yields 2 NaO
Na2 + O2 yields Na2O2
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The principle of conservation of mass is true
only for reactions that take place in open systems.
only for reactions that take place in closed systems.
for reactions in both open and closed systems.
for no reactions at all.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In chemical reactions, what does the principle of conservation of mass mean?
Matter is not created or destroyed.
The total mass of the reactants is greater than the total mass of the products.
The total mass of the reactants is less than the total mass of the products.
Matter is not changed.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Chemicals that act as biological catalysts by speeding up reactions in living things are called
inhibitors
enzymes
fuels
reactants
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