AnswersChemistry - SC3210 A-CRLab: Ionic and Covalent Bonds

Lab: Ionic and Covalent Bonds — Unit test Answers

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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
2
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Which jar contains a mixture?

A
a jar of solid carbon
B
a jar of carbon dioxide gas
C
a jar of liquid copper
D
a jar of copper and water
3

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.
4

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.
5

Which is a pure substance?

A
air
B
nitrogen
C
apple juice
D
tap water
6

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
7

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
8

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
9

Water is called the “universal solvent.” Which statement best explains this description with respect to ionic compounds?

A
Water can dissociate all ionic compounds through ion-dipole interactions.
B
Water can hydrate many ionic compounds through hydrogen-bonding interactions.
C
Water can dissociate many ionic compounds through ion-dipole interactions.
D
Water can hydrate many ionic compounds through dipole-dipole interactions.
10

Which best explains why water has a much higher boiling point than would otherwise be predicted?

A
Water forms weak hydrogen bonds.
B
Water forms strong hydrogen bonds.
C
Water has weak cohesive forces.
D
Water has strong adhesive forces.
11

Which describes the polarity in a water molecule?

A
partial negative charge on the oxygen atom because its electrons are pulled toward the hydrogen atoms
B
partial negative charge on the oxygen atom because it pulls electrons from the hydrogen atoms
C
partial positive charge on the oxygen atom because it pulls electrons from the hydrogen atoms
D
partial positive charge on the oxygen atom because its electrons are pulled toward the hydrogen atoms
12

Which is most likely true about water in chemical systems?

A
Water dissolves nonpolar ionic compounds.
B
Water dissociates ionic compounds.
C
Water dissociates covalent molecules.
D
Water dissolves nonpolar covalent substances.

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