AnswersChemistryAcids and Bases

Practice Test Answers

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1
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Which substance has the lowest open bracket cap h raised to the plus power close bracket concentration but is still considered an acid?

A
blood
B
gastric fluid
C
household lye
D
milk
2
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What is the relationship between cap k sub A and cap k sub b with cap k sub w ?

A
The quotient of ​​​​​​​ cap k sub A and ​​​​​​​​​​​​​​ cap k sub b equals the auto-dissociation constant for water.
B
The product of ​​​​​​​ cap k sub A and ​​​​​​​​​​​​​​ cap k sub b equals the auto-dissociation constant for water.
C
The sum of ​​​​​​​ cap k sub A and ​​​​​​​​​​​​​​ cap k sub b equals the auto-dissociation constant for water.
D
The difference of ​​​​​​​ cap k sub A and ​​​​​​​​​​​​​​ cap k sub b equals the auto-dissociation constant for water.
3

How does litmus paper identify a base?

A
A base turns blue litmus red.
B
A base turns red litmus blue.
C
A base turns yellow litmus blue.
D
A base turns orange litmus red.
4

What do strong acids and strong bases have in common?

A
They both partially dissociate, with reverse reactions occurring.
B
They both dissociate completely, with little or no reverse reactions.
C
They both remain intact when placed in water, with no dissociation taking place.
D
They both dissociate completely, with reverse reactions constantly taking place.
5

Which of these is true about a pH meter?

A
It is inexpensive to use.
B
It measures pH indirectly.
C
It does not require calibration.
D
It can be used in any acid-base titration.
6

Why is citric acid added to food?

A
to add bitterness
B
to add color
C
to add tartness
D
to add sweetness
7

The equivalence point in a titration refers to the point when

A
the mL of the acid equals the mL of the base.
B
the molarity of the acid used in the reaction equals the molarity of the base used in the reaction.
C
the number of moles of one reactant reacts completely with the moles of the other reactant.
D
the acid in the flask turns clear.
8

Which salt is produced when NH sub 4 OH reacts with HNO sub 3 ?

A
NH sub 4 NO sub 2
B
NH sub 4 NO sub 3
C
KNO sub 2
D
NaNO sub 3
9

The two products that are formed when a solution of HNO sub 3 and a solution of NaOH react are water and

A
NaHNO .
B
NaNO sub 3 .
C
NaHNO sub 3 .
D
NaNO sub 2 .
10

A substance is dissolved in water and produces hydronium ions. This occurs when hydrogen ions move from the substance to associate with water molecules. Which term best matches the behavior of this substance?

A
Bronsted-Lowry base
B
Arrhenius acid
C
Bronsted-Lowry acid
D
Arrhenius base
11

Which of these equations correctly expresses the self-ionization of water?

A
cap h sub 2 cap o plus cap h sub 3 cap o raised to the plus left right arrow cap h sub 2 cap o plus OH raised to the negative power power
B
cap h sub 2 cap o plus cap h sub 2 cap o left right arrow 2 OH raised to the negative power
C
cap h sub 2 cap o plus cap h sub 2 cap o left right arrow 2H sub 3 cap o raised to the plus power
D
cap h sub 2 cap o plus cap h sub 2 cap o left right arrow cap h sub 3 cap o raised to the plus plus OH raised to the negative power power
12

What is the Arrhenius definition of a base?

A
A substance that increases OH raised to the negative power concentration when it is dissolved in water.
B
A substance that increases cap h sub 2 cap o raised to the plus power concentration when it is dissolved in water.
C
A compound that donates protons.
D
A compound that accepts protons.
13

At which of the four labeled points on the given titration curve do you expect to find the highest concentration of hydroxide ions?

A
A
B
B
C
C
D
D
14

Based on the structure of the curve, which kinds of base and acid did the students most likely use?

A
a weak acid by a strong base
B
a strong acid by a weak base
C
a weak base by a strong diprotic acid
D
a weak acid by a weak base

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