AnswersGCS 2025-2026 Physical Science Credit RecoveryUnit Test

Unit Test — Unit test Answers

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1
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When dissolved in water, an acid or a base breaks down into

A
a proton and an electron.
B
two negative ions.
C
a positive and a negative ion.
D
a positive ion and a proton.
2
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Which is a strong base?

A
HCl
B
NaOH
C
NH3
D
H3CO3
3

Which best describes a mixture?

A
It has a single composition, and it has a set of characteristics that does not change.
B
It can have different compositions, but it has a set of characteristics that does not change.
C
It has a single composition, but it has a set of characteristics that does change.
D
It can have different compositions, and it has a set of characteristics that does change.
4

Which describes a homogeneous mixture?

A
A solvent dissolves in a solute to make a solution.
B
A solute dissolves in a solvent to make a solution.
C
A solution dissolves in a solute to make a solvent.
D
A solution dissolves in a solvent to make a solute.
5

Which acid is naturally found in foods and can be safe to eat?

A
sulfuric acid
B
citric acid
C
hydrochloric acid
D
nitric acid
6

Which substance is used in lotions and cosmetics?

A
ammonium hydroxide
B
acetic acid
C
formic acid
D
zinc hydroxide
7

Which would increase the rate of dissolving salt into water?

A
low temperature
B
little to no agitation
C
more surface area
D
darker colors
8

Carla is making two drinks. She is making one hot chocolate and one chocolate milk. Which best describes the agitation needed to make sure the cocoa powder is mixed in well?

A
Chocolate milk would require more agitation than hot chocolate does.
B
Hot chocolate would require more agitation than chocolate milk does.
C
They would both require the same agitation.
D
Neither would require any agitation.
9

A solution has a pH of 2. Which best describes the solution?

A
a strong acid
B
a strong base
C
a neutral solution
D
a weak base
10

Which best describes solubility?

A
the speed at which a substance dissolves
B
the ability of one substance to dissolve in another
C
the amount of surface area per a given mass
D
the temperature at which subtances become a mixture
11

To make a solution for an experiment, Gunther needs to add 40 g of a solute to 100 g of water. When making the solution at room temperature, he could only add 34 grams before the solute settled out.What could he do to dissolve the remaining 6 grams of the solute?

A
Put the solution in an ice bath, dissolve the solute, and let the solution return to room temperature.
B
Heat the solution, dissolve the solute, and let the solution cool verifying nothing settled out.
C
Add more water, boil the solution, and dissolve the solute until the some of the water evaporates.
D
Keep the solution at room temperature, add more water, and dissolve the excess solute.
12

The equation shows a neutralization reaction.H2SO4 + 2NaOH Na2SO4 + 2H2O

Question illustration
A
an acid
B
a base
C
a salt
D
an ion
13

What ion do acids release in solution?

A
hydrogen
B
hydroxide
C
carbonate
D
ammonium
14

Which substance is a base?

A
HCOOH
B
RbOH
C
H2CO3
D
NaNO3
15

Which property describes a mixture?

A
It cannot be separated by physical methods.
B
It has a single chemical composition.
C
It cannot have more than one state of matter.
D
It cannot be described by a chemical symbol or formula.
16

Which lists mixtures, in order, from the smallest particles to the largest particles?

A
solution, colloid, suspension
B
solution, suspension, colloid
C
suspension, colloid, solution
D
suspension, solution, colloid
17

Who would most likely be required to work with sodium hydroxide?

A
a plumber
B
a gardener
C
a bricklayer
D
a mechanic
18

Julie takes a cold glass of clear, colorless liquid out of the refrigerator and puts it on the table. As the liquid warms up to room temperature, Julie sees bubbles of gas form in the liquid and rise to the surface.Which conclusion is best supported by Julie’s observations?

A
The liquid is a pure substance because it is colorless.
B
The liquid is a mixture because its temperature rises.
C
The liquid is a pure substance because it remains liquid when cold.
D
The liquid is a mixture because it has a gas dissolved in a liquid.
19

Otis watches a cooking show on making mayonnaise. The chef dissolves salt and sugar in vinegar. She mixes in an egg yolk, and then mixes in oil until the ingredients are completely blended together. The chef says that it’s great on sandwiches and that it can be stored without separating.Which best describes the purpose of the egg yolk in the recipe?

A
It allows the oil to change from liquid to a gas in order to form bubbles.
B
It acts to hold the vinegar and oil together in a colloid.
C
It helps the vinegar be able to form a solution with the salt and sugar.
D
It mixes with both the vinegar and oil to form a suspension.
20

What is the correct classification of a mixture in which both a solid and a liquid are visible?

A
a homogeneous mixture and a solution
B
a homogeneous mixture and a suspension
C
a heterogeneous mixture and a solution
D
a heterogeneous mixture and a suspension

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