AnswersChemistry - SC3210 A-CRLab: Ionic and Covalent Bonds

Lab: Ionic and Covalent Bonds — Unit test Answers

0 verified answers2 views
1
Free Preview

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
2
Free Preview

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.
3

Which describes a property of water that allows plants to transfer it from their roots to their leaves?

A
Water exhibits weak adhesion and cohesion, which allows capillary action to occur.
B
Water exhibits strong adhesion and cohesion, which allows capillary action to occur.
C
Water has low surface tension, which prevents capillary action from occurring.
D
Water has high surface tension, which prevents capillary action from occurring.
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 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.
6

Which statement highlights a unique role of water in a biological system?

A
Organisms cannot use it to regulate their body temperature.
B
Few organisms can use it as a living environment.
C
It does not provide structural support to organisms.
D
It provides organisms a medium to transport materials.
7

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
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

Which contributes to the polarity of a water molecule?

A
a linear shape along with strong covalent bonds
B
deflection of hydrogen atoms by lone pairs of electrons
C
no difference in the electronegativity of oxygen and hydrogen
D
hydrogen bond formation between water molecules
10

What happens to water when it freezes?

A
Its mass increases.
B
Its mass decreases.
C
Its density increases.
D
Its density decreases.
11

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.
12

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
13

Which best explains why water has a high specific heat?

A
Hydrogen bonds decrease the amount of energy that is required for the temperature to change.
B
Hydrogen bonds increase the amount of energy that is required for the temperature to change.
C
Ion-dipole interactions increase the amount of energy that is required for the temperature to change.
D
Ion-dipole interactions decrease the amount of energy that is required for the temperature to change.
14

Which is a cause of polarity in water molecules?

A
partial negative charge on the hydrogen atoms
B
partial positive charge on the oxygen atom
C
high electronegativity difference between oxygen and hydrogen
D
low electronegativity difference between oxygen and hydrogen
15

Which will settle out if allowed to sit on a table?

A
a suspension
B
a colloid
C
a solution
D
a compound
16

Which best explains why blood and the cytoplasm of cells are mainly composed of liquid water?

A
Water is a common substance and is readily available.
B
Water is an important transport and reaction medium.
C
Water prevents biological reactions from occurring readily.
D
Water prevents turgor pressure from making the cells too rigid.
17

Which most likely represents the process of dissolving carbon dioxide in soda?

A
increased temperature to increase solubility
B
increased pressure to increase solubility
C
decreased agitation to decrease solubility
D
decreased pressure to increase solubility
18

Dominic made the table below to organize his notes about mixtures.What mistake did Dominic make?

Question illustration
A
The title should read “Properties of Solutions” because some mixtures do not have all of the properties listed.
B
There is a definite recipe to make each mixture, so the composition of a mixture is set.
C
Although it is possible to have more than one state, it is also possible to have only one state.
D
A single substance can be used to make a mixture if the substance is composed of more than one element.
19

The solute will dissolve quicker if the solute is more

A
shaken.
B
saturated.
C
cooled.
D
settled.
20

Oil and water placed in a jar will separate. Even when shaken and mixed, the oil still separates from the water.

A
Oil and water are highly soluble because they have separate chemical properties.
B
Oil and water have a low solubility because they have separate chemical properties.
C
Oil and water are highly soluble because they exert different pressures.
D
Oil and water have a low solubility because they exert different pressures.

Did you find these answers helpful?

More from this Course

Quiz
23 verified answers

Reaction Rate

Quiz
10 verified answers

Compounds

Quiz
10 verified answers

Intermolecular Forces