Answers2026-2027_MDCPS_2003345_Chemistry_1_B-CRLab: Solubility

Lab: Solubility — Unit test Answers

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1
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Which statement describes a chemical property of water?

A
It reacts with sodium metal.
B
It has a melting point of 0°C.
C
It has a density of about 1 g/mL.
D
It is clear and colorless.
2
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When a strip of magnesium metal is touched to a flame, a bright light and a whitish substance are produced. Why is the burning of magnesium considered a chemical change?

A
because the metal reaches a high temperature
B
because the metal begins to melt
C
because a new substance is formed
D
because the metal is malleable
3

A can of soda contains many ingredients, including vanilla, caffeine, sugar, and water. Which ingredient is the solvent?

A
caffeine
B
sugar
C
vanilla
D
water
4

Which statement describes heterogeneous mixtures?

A
They are made up of two or more pure substances that are not chemically bonded together and appear non-uniform.
B
The substances they are composed of can only be separated chemically.
C
The substances they are composed of have fixed ratios between their components.
D
They are made up of two or more pure substances that are chemically bonded together and appear uniform.
5

Which of these factors will cause a solid solute to dissolve faster?

A
increasing the air temperature
B
increasing the amount of solute
C
increasing the amount of solvent
D
increasing the surface area of solute
6

A piece of sodium metal can be described as

A
a pure substance and a compound.
B
an impure substance that is reactive.
C
an impure substance that is unreactive.
D
a pure substance and an element.
7

The graph below shows how solubility changes with temperature.How many grams of NaCl will be needed to form 600 mL of a saturated solution at 100°C?

Question illustration
A
15 g
B
24 g
C
40 g
D
240 g
8

Which statement describes an extensive property of matter?

A
It changes with the color of a substance.
B
It changes when a new substance is formed.
C
It changes with the amount of sample that is present.
D
It changes with the composition of a substance.
9

Which statement accurately describes part of the dissolving process of a polar solute in water?

A
Solute molecules repel water molecules.
B
Water molecules surround solute molecules.
C
Water molecules are strongly attracted to nonpolar substances.
D
Solute molecules remain concentrated in one part of the solvent.
10

Which is an example of a nonaqueous solution?

A
gasoline
B
fog
C
mayonnaise
D
fruit juice
11

Which factor influences both solubility and the rate of dissolution?

A
pressure
B
temperature
C
particle size
D
nature of solvent
12

A solution contains 90 mL of methanol, 18 mL of propanol, and 2 mL of diethyl ether. Which is the solvent in this solution?

A
methanol
B
propanol
C
diethyl ether
D
water
13

Which of these is an example of a physical change?

A
sugar, when heated, producing carbon dioxide and water
B
solid ice, when heated, turning into liquid water
C
sodium, when exposed to chlorine, forming sodium chloride
D
aluminum, when heated in air, forming aluminum oxide
14

Brownian motion is not observed in a mixture that includes two phases. Which best identifies the mixture?

A
a colloid
B
a suspension
C
a solution
D
an alloy
15

Which physical method can separate a mixture of steel ball bearings and marbles?

A
boiling
B
evaporation
C
filtration
D
sorting

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