AnswersChemistry 1A - Mr. KaanWriting and Balancing Chemical Equations

Writing and Balancing Chemical Equations — Unit test Answers

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Consider the reaction below.HF + H2O H3O + FWhich is an acid-conjugate base pair?

Question illustration
A
HF and H3O+
B
HF and F
Option B
C
H2O and HF
D
H2O and F
Option D
22
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Consider the reaction below.HI + H2O H3O+ + I–Which is an acid-conjugate base pair?

Question illustration
A
HI and H2O
B
H2O and H3O+
C
H3O+ and I–
D
HI and I–
23

Which best describes the definition of Lewis acids and bases?

A
a general definition based on electron structure
B
a general definition based on hydrogen ion concentration
C
a specific definition based on a compound’s ability to accept protons
D
a specific definition based on a compound’s ability to donate protons
24

The pH of a solution decreases by 2.0. How does the hydronium ion concentration of the solution change?

A
increases to 2 times the original concentration
B
increases to 100 times the original concentration
C
decreases to of the original concentration
Option C
D
decreases to of the original concentration
Option D
25

H2CO3 is used in soft drinks. What is the name of this compound?

A
sulfuric acid
B
carbonic acid
C
tartaric acid
D
hydrochloric acid
26

Look at the reaction below.Which substance is the acid in the reaction?

Question illustration
A
Mg(s)
B
H2(g)
C
MgSO4(aq)
D
H2SO4(aq)
27

H2SO4 is added to a large beaker of water. How is the solution different from the original water?

A
The solution turns blue litmus to red.
B
The solution turns phenolphthalein pink.
C
The solution has fewer hydrogen ions.
D
The solution has more hydroxide ions.
28

What is the pH of a solution with [H+] = 1.25 10–10 M?Use .

Question illustration
A
–10.1
B
–9.90
C
7.90
D
9.90
29

Based on the definition of logarithms, what is the difference in hydrogen ion concentration between a substance with a pH of 2 and a substance with a pH of 3?

A
A substance with a pH of 2 has a 10 times higher concentration of H+ than a substance with a pH of 3.
B
A substance with a pH of 3 has a 10 times higher concentration of H+ than a substance with a pH of 2.
C
A substance with a pH of 2 has a 100 times higher concentration of H+ ions than a substance with a pH of 3.
D
A substance with a pH of 3 has a 100 times higher concentration of H+ ions than a substance with a pH of 2.
30

What is the Bronsted-Lowry definition of an acid?

A
a compound that donates protons
B
a compound that accepts protons
C
a substance that increases hydroxide ion concentration
D
a substance that increases hydronium ion concentration
31

The main active components of bleach and many other household cleaners are

A
salts.
B
neutral.
C
acids.
D
bases.
32

Which describes an alkaline solution?

A
pH less than 7
B
pH equal to 7
C
basic
D
acidic
33

What is the equilibrium constant of pure water at 25°C?

A
1014
B
10–14
C
10–7
D
107
34

Which of these acids occurs naturally in the body and performs important regulatory functions?

A
carbonic acid
B
acetic acid
C
magnesium hydroxide
D
sodium hydroxide
35

When does phenolphthalein turn pink?

A
in the presence of a base
B
in the presence of an acid
C
when it is in a neutral solution
D
when it is reacting with a metal
36

Which is a characteristic of a Lewis base?

A
It behaves as the electron donor.
B
It behaves as the electron acceptor.
C
It donates a hydrogen ion to other compounds.
D
It increases the concentration of hydrogen ions.

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