AnswersIA-Chemistry A Survey of Chemistry ALab: Types of Reactions

Lab: Types of Reactions — Unit test Answers

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1
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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.
2
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Which statement is true about an empirical formula?

A
It is the true ratio of atoms in a formula unit.
B
It is the simplest ratio of atoms in a formula unit.
C
It represents the true molecular mass of a chemical formula.
D
It represents the highest ratio of coefficients in a chemical formula.
3

What is the percent by mass of water in Na2SO4 • 10H2O?Use .

Question illustration
A
5.59%
B
11.26%
C
44.08%
D
55.92%
4

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
5

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.
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

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
8

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
9

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
10

What is the empirical formula for propene (C3H6)?

A
C2H4
B
C4H8
C
C3H6
D
CH2
11

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.
12

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
13

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

A
combustion
B
double replacement
C
decomposition
D
single replacement
14

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
15

If a compound has a molar mass of 180 g/mol and its empirical formula is CH2O, what is its molecular formula?

A
CH2O
B
C2H4O2
C
C6H12O6
D
C12H22O11

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