AnswersCHS Chemistry AUnit Test

Unit Test — Unit test Answers

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An unbalanced chemical equation for the reaction of boron fluoride with lithium sulfite is shown below.BF3 + Li2SO3 B2(SO3)3 + LiFWhat is the coefficient of lithium fluoride in the balanced chemical reaction?

Question illustration
A
1
B
3
C
4
D
6
2
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Iron reacts with oxygen to form iron oxide (rust). Which best describes this statement?

A
Iron oxide is the liquid state of iron.
B
Iron oxide is the gaseous state of iron.
C
Iron oxide is formed by rearranging atoms.
D
Iron oxide is made up of only iron atoms.
3

This formula equation is unbalanced.BaCl2(aq) + Na2CO3(aq) BaCO3(s) + NaCl(aq) Which coefficient should be placed in front of NaCl to balance this equation?

Question illustration
A
1
B
2
C
3
D
4
4

Which word equation shows lithium oxide being formed from the reaction between oxygen and lithium?

A
oxygen + lithium oxide lithium
Option A
B
lithium + oxygen lithium oxide
Option B
C
oxygen + lithium lithium + oxide
Option C
D
lithium oxide lithium + oxygen
Option D
5

During an experiment, Jon exhales through a straw and blows bubbles into a solution. Which observation would most likely indicate that a chemical reaction is occurring?

A
The bubbles disappear into the solution before reaching the surface.
B
The gas forms a layer above the surface of the solution.
C
The solution becomes very stirred up by the bubbles.
D
The solution becomes cloudy with a white solid.
6

Sodium combines with water to produce sodium hydroxide and hydrogen gas. Which word equation represents this violent reaction?

A
sodium hydroxide + water sodium + hydrogen
Option A
B
sodium + water sodium hydroxide + hydrogen
Option B
C
sodium + hydrogen sodium hydroxide + water
Option C
D
sodium + sodium hydroxide water + hydrogen
Option D
7

Shown below is a chemical reaction.Fe + CuCl2 FeCl2 + CuWhich pair of substances are the products?

Question illustration
A
Fe and CuCl2
B
Fe and FeCl2
C
CuCl2 and Cu
D
FeCl2 and Cu
8

Which process is a chemical change?

A
breaking of glass
B
formation of frost
C
magnetization of an iron nail
D
loss of atmospheric ozone
9

In which two types of reactions do opposite chemical changes occur?

A
double replacement and combustion
B
single replacement and double replacement
C
synthesis and decomposition
D
combustion and synthesis
10

Propane reacts with oxygen to form carbon dioxide and water. This chemical reaction is most likely a

A
combustion reaction.
B
decomposition reaction.
C
single replacement reaction.
D
double replacement reaction.
11

Which equation is a decomposition reaction?

A
Li2CO3 Li2O + CO2
Option A
B
Zn + HCl ZnCl2 + H2
Option B
C
Na2O + CO2 Na2CO3
Option C
D
C6H12O6 + O2 CO2 + H2O
Option D
12

Chemists use activity series to determine whether which type of reaction will occur?

A
combustion
B
double replacement
C
decomposition
D
single replacement

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Unit Test — Unit test Answers — CHS Chemistry A