AnswersPhysical ScienceMixtures, Solutions, and Acid-Base Reactions

Mixtures, Solutions, and Acid-Base Reactions — Test Answers

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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
Keep the solution at room temperature, add more water, and dissolve the excess solute.
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
Put the solution in an ice bath, dissolve the solute, and let the solution return to room temperature.
3

Eli states that sodium phosphate is a mixture because it is composed of both sodium ions and phosphate ions. Which is the best analysis of Eli’s statement?

A
It is incorrect because the two types of ions in sodium phosphate cannot be seen.
B
It is correct because each ion is a pure substance, so sodium phosphate is made up of two pure substances.
C
It is incorrect because sodium phosphate is a compound that has a single composition.
D
It is correct because the composition of sodium phosphate changes depending on the sample.
4

Which would be least likely to completely dissolve in water?

A
sulfuric acid
B
acetic acid
C
nitric acid
D
hydrochloric acid
5

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

A
a positive ion and a proton.
B
a proton and an electron.
C
two negative ions.
D
a positive and a negative ion.
7

Which substance is a base?

A
cap h sub 2 CO sub 3
B
RbOH
C
HCOOH
D
NaNO sub 3
8

Which best describes solubility?

A
the amount of surface area per a given mass
B
the speed at which a substance dissolves
C
the ability of one substance to dissolve in another
D
the temperature at which subtances become a mixture
9

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

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

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

A
solution, suspension, colloid
B
suspension, colloid, solution
C
solution, colloid, suspension
D
suspension, solution, colloid
12

What ion do acids release in solution?

A
ammonium
B
hydrogen
C
hydroxide
D
carbonate
13

In which situation will screening be used to separate a mixture?

A
if the components have different colors
B
if the components have different boiling points
C
if the mixture is a solid suspended in a gas
D
if the mixture is a solid dissolved in a liquid
14

Which is a strong base?

A
HCl
B
cap h sub 3 CO sub 3
C
NH sub 3
D
NaOH
15

Which explains one reason evaporation can be used to separate a mixture?

A
The desired component has the smallest particles in the mixture.
B
The mixture is a solution that contains a substance that will crystallize out.
C
The desired component has a different density from the other components.
D
The desired component has a higher boiling point than the other components.
17

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
Neither would require any agitation.
C
Hot chocolate would require more agitation than chocolate milk does.
D
They would both require the same agitation.
18

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

A
hydrochloric acid
B
sulfuric acid
C
citric acid
D
nitric acid
19

Which best describes a mixture?

A
It can have different compositions, but it has a set of characteristics that does not change.
B
It can have different compositions, and it has a set of characteristics that does change.
C
It has a single composition, and it has a set of characteristics that does not change.
D
It has a single composition, but it has a set of characteristics that does change.
20

Which describes a homogeneous mixture?

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

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