AnswersChemistry A.1 - F26 - Jacob MetskerLab: Calorimetry and Specific Heat

Lab: Calorimetry and Specific Heat — Unit test Answers

25 verified answers
1
Free Preview

The table below lists some acids and bases.Strong acidsWeak acidsWeak basesStrong basesHBrCH3COOHNH3NaOHHNO3HCOOHNH4OHKOHH2SO4 Ca(OH)2Which reaction yields a salt that has a pH < 7?

A
mc013-1.jpg
Option A
B
mc013-2.jpg
Option B
C
mc013-3.jpg
Option C
D
mc013-4.jpg
Option D
2
Free Preview

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.
3

A solution of ammonia has a pH of 11.8. What is the concentration of OH– ions in the solution?Useful formulas include , , , and .

Question illustration
A
1.58 10–12 M
Option A
B
6.31 10–3 M
Option B
C
2.20 M
D
158 M
4

Which of the following substances is an Arrhenius acid?

A
BF3
B
HCN
C
NH3
D
Mg(OH)2
5

Which heterogeneous mixture contains large particles that can settle out or can be filtered?

A
colloid
B
compound
C
element
D
suspension
6

What is the name of a solution whose concentration of solute is equal to the maximum concentration that is predicted from the solute's solubility?

A
dilute
B
saturated
C
unsaturated
D
supersaturated
7

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.
8

Which description correctly characterizes the acidity or basicity of a solution?

A
The higher the pH is, the more the hydroxide ion concentration decreases and the more acidic the solution becomes.
B
The higher the pH is, the more the hydroxide ion concentration increases and the more basic the solution becomes.
C
The lower the pH is, the more the hydronium ion concentration decreases and the more acidic the solution becomes.
D
The lower the pH is, the more the hydronium ion concentration increases and the more basic the solution becomes.
9

What type of mixture scatters light and cannot be filtered easily?

A
a colloid, a heterogeneous mixture
B
a solution, a heterogeneous mixture
C
a colloid, a homogeneous mixture
D
a solution, a homogeneous mixture
10

Which is true about the dissolving process in water?

A
Polar solutes do not dissolve easily in water.
B
Water molecules are attracted by solute ions at the surface of the solute.
C
Water molecules move throughout the solute.
D
Solute molecules pull water molecules away from the surface.
11

Which of the following is the correctly balanced chemical equation for the reaction of Ca(OH)2 and HNO3?

A
Upper C a (upper O upper H) subscript 2 plus upper H upper N upper O subscript 3 right arrow upper C a superscript 2 plus, plus upper N upper O subscript 3 superscript minus.
Option A
B
Upper C a (upper O upper H) subscript 2 plus 2 upper H upper N upper O subscript 3 right arrow 2 upper H subscript 2 upper O plus 2 upper N upper O subscript 3 superscript minus
Option B
C
Upper C a (upper O upper H) subscript 2 plus upper H upper N upper O subscript 3 right arrow upper H subscript 2 upper O plus upper C a upper N upper O subscript 3.
Option C
D
Upper C a (upper O upper H) subscript 2 plus 2 upper H upper N upper O subscript 3 right arrow 2 upper H subscript 2 upper O plus UPper C a (upper N upper O subscript 3) subscript 2.
Option D
12

Consider the reaction below.NH4+ + H2O NH3 + H3O+Which is an acid-conjugate base pair?

Question illustration
A
NH4+ and NH3
B
NH4+ and H3O+
C
H2O and NH3
D
H2O and H3O+
13

An unknown substance turns blue litmus paper to red. Which additional test could be used to confirm the substance’s identity?

A
It should turn phenolphthalein from colorless to pink because it is a base.
B
It should turn phenolphthalein from pink to colorless because it is a base.
C
It should turn methyl orange to orange because it is an acid.
D
It should turn methyl orange to red because it is an acid.
14

Which pair of substances would most likely result in the production of a gas when reacting with an acid?

A
litmus and methyl orange
B
base and salt
C
metal and carbonate
D
carbon dioxide and water
15

A salt is best described as a compound that is formed from the reaction between

A
an acid and a base.
B
a strong acid and a weak acid.
C
a strong base and a weak base.
D
an acid and water.
16

Which statements are true of heterogeneous mixtures? 1) They settle out. 2) The proportions of solute to solvent may vary. 3) The solute is evenly distributed throughout. 4) They are composed of two solvents and two solutes.

A
1 and 2
B
2 and 4
C
3 only
D
2 only
17

A solution of HCl has = 0.01 M. What is the pH of this solution?Use .

Question illustration
A
–2
B
–1
C
1
D
2
18

Lewis acids and bases are most closely associated with which process?

A
proton transfer
B
electron transfer
C
the formation of aqueous ions
D
the formation of a conjugate acid or base
19

Which of these correctly defines the pOH of a solution?

A
the log of the hydronium ion concentration
B
the negative log of the hydronium ion concentration
C
the log of the hydroxide ion concentration
D
the negative log of the hydroxide ion concentration
20

Soaps feel slippery on our hands because they dissolve the oil on our skin, decreasing friction.This is because soap contains

A
a neutral molecule.
B
a salt molecule.
C
an acid.
D
a base.

Did you find these answers helpful?

More from this Course

Quiz
23 verified answers

Unit Test

Quiz
25 verified answers

Unit Test

Quiz
10 verified answers

Neutralization Reactions