AnswersELPGEQ3 MJ Science 3 - 2002100 HCPS v24Unit Test

Unit Test — Unit test Answers

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Fred has a large piece of sugar that is not dissolving in his drink. How could he get the sugar chunk to dissolve faster?

A
by placing it in the refrigerator
B
by breaking it up into smaller pieces
C
by letting it dissolve naturally without agitation
D
by adding a larger piece so the smaller one will dissolve
2
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Which two compounds are used in batteries?

A
sulfuric acid and potassium hydroxide
B
ammonium hydroxide and nitric acid
C
potassium hydroxide and nitric acid
D
sulfuric acid and ammonium hydroxide
3

While playing soccer, Carla slides across one of the lines on the field. When she stands up, what base does she dust off?

A
calcium hydroxide
B
ammonium hydroxide
C
zinc hydroxide
D
potassium hydroxide
4

Hamid made this table to organize his notes on the properties of acids and bases.Which property is in the wrong column?

Question illustration
A
taste sour
B
react with carbonates
C
conduct electric current
D
form hydrogen gas with metals
5

Which substance is important in making plastics?

A
zinc hydroxide
B
ammonia
C
acetic acid
D
nitric acid
6

Which separation procedure is most likely to happen?

A
Freezing a compound will break it down into elements.
B
Filtering a mixture will separate it into substances.
C
Boiling a pure substance will separate it into mixtures.
D
Melting an element will break it down into compounds.
7

Helen needs to make a supersaturated solution of saltwater. Which describes the best way to make the solution?

A
increase the temperature of the solution and add more salt
B
decrease the temperature of the solution and add less salt
C
decrease the pressure and add more salt
D
increase the pressure and add less salt
8

Zora wants to dissolve a solute in a solvent quickly. Which best describes what she should do?

A
decrease the pressure
B
decrease the surface area
C
shake it repeatedly
D
place in a refrigerator
9

Which solution has the greatest number of hydrogen ions?

A
blood, pH = 7.2
B
lemon juice, pH = 2
C
soda, pH = 3.5
D
bleach, pH = 13.5
10

Rolf prepares four solutions using different solutes as shown in the table below.Which solution is unsaturated?

Question illustration
A
Solution A
B
Solution B
C
Solution C
D
Solution D
11

Which is a property of every homogeneous mixture?

A
Each part of the mixture has the same appearance.
B
The mixture is made up of a solid dissolved in a liquid.
C
The characteristics of the mixture change within a single sample.
D
The components of the mixture change within a single sample.
12

A student combined equal amounts of two solutions. One solution had a pH of 2 and the other had a pH of 12. Which would most likely be the resulting pH?

A
1
B
3
C
6
D
11
13

Which is a pure substance?

A
air
B
nitrogen
C
apple juice
D
tap water
14

A student is trying to determine if a solution is acidic or basic. She does not have any litmus paper. Which would she most likely use to get a reading on her solution?

A
vinegar
B
soap
C
cabbage juice
D
aquarium water
15

The pH of a solution is 7. Which best describes the solution?

A
The solution has more hydrogen ions than hydroxide ions.
B
The solution has fewer hydrogen ions than hand soap.
C
The solution has the same number of hydrogen ions as apple juice.
D
The solution has the same number of hydrogen ions and hydroxide ions.

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