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WorksheetsUnit 5: Chemical Reactions
Total questions: 10
Worksheet time: 7mins
Name
Class
Date
1.
Which equation is a synthesis reaction?
a)
CH4 + 2O2 → CO2 + 2H2O
b)
CH4 + ClO2 → CCl + H2O
c)
S2 + Li → S2Li
2.
Which of the following is NOT a chemical change?
a)
Iron Rusting
b)
Burning Paper
c)
Cutting Paper
d)
Baking a cake
3.
All of the following reactions are correctly balanced except-
a)
A
b)
B
c)
C
d)
D
4.
Always starts with a Hydrocarbon that reacts with oxygen and produces carbon dioxide and water.
a)
Decomposition
b)
Synthesis
c)
Combustion
d)
Single Replacement
5.
Which one is true?
a)
Adding a Catalyst lowers rate of reaction
b)
Lowering the concentration lowers the rate of reaction
c)
Raising Surface Area raises the rate of reaction
d)
Raising the Temperature lowers rate
6.
The Law of Conservation of Mass states
a)
that matter exists in all states and reacts the same
b)
that matter can only be changed into new substances by introducing a catalyst
c)
that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants
d)
that matter exists in the same state throughout any chemical change
7.
A chemical reaction that absorbs heat
a)
Single replacement
b)
Exothermic
c)
Endothermic
d)
Decomposition
8.
In a chemical reaction, everything to the rightof the arrow is called ______________.
a)
Molecules
b)
Yields
c)
Products
d)
Reactants
9.
Which problem is balanced?
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
10.
a copper penny turning greenish after a few years.
a)
Chemical Change
b)
Physical Change
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