Which is a characteristic of a strong base?
It turns pink phenolphthalein colorless.
It turns blue litmus paper red.
It releases H+ ions into a solution.
It removes H+ ions from solution.
answer
It removes H+ ions from solution.
question
Which of the following best defines an acid?
An acid has a pH of 7.
An acid has hydroxide ions.
An acid has fewer positive ions in solution.
An acid has more hydrogen ions in solution.
answer
An acid has more hydrogen ions in solution.
question
When does phenolphthalein turn pink?
in the presence of a base
in the presence of an acid
when it is in a neutral solution
when it is reacting with a metal
answer
in the presence of a base
question
Which pair of substances would most likely result in the production of a solid when reacting with a base?
litmus and phenolphthalein
soluble metal salt and carbon dioxide
acids and water
hydrogen ions and soaps
answer
soluble metal salt and carbon dioxide
question
Which compound plays an important role in leather processing and electroplating?
nitric acid
hydrochloric acid
ammonia
magnesium hydroxide
answer
hydrochloric acid
question
The reaction below demonstrates which characteristic of a base?
mc026-1.jpg
the ability of bases to release sodium ions into solution
the ability of bases to release hydrogen ions into solution
the ability of a base to react with carbonate or bicarbonate
the ability of a base to react with a soluble metal salt
answer
the ability of a base to react with a soluble metal salt
question
Look at the reaction below.
mc021-1.jpg
Which substance is the base in the reaction?
2H2O (l)
H2SO4 (aq)
CaSO4 (aq)
Ca(OH)2 (aq)
answer
Ca(OH)2 (aq)
question
The main active components of bleach and many other household cleaners are
salts.
neutral.
acids.
bases.
answer
bases.
question
H2CO3 is used in soft drinks. What is the name of this compound?
sulfuric acid
carbonic acid
tartaric acid
hydrochloric acid
answer
carbonic acid
question
Which of these substances contributes to soap's slippery texture?
an acid
a base
carbonate
water
answer
a base
question
Consider the reaction below.
HClO3 + NH3 mc012-1.jpg NH4+ + ClO3-
Which is a base-conjugate acid pair?
NH3 and ClO3-
NH3 and NH4+
HClO3 and NH3
HClO3 and NH4+
answer
NH3 and NH4+
question
What is the Bronsted-Lowry definition of a base?
a compound that donates protons
a compound that accepts protons
a substance that increases hydroxide ion concentration
a substance that increases hydronium ion concentration
answer
a compound that accepts protons
question
A chemist lectures about the following definition for acids and bases.
The acid-base behavior is analyzed in terms of how electrons are transferred between compounds rather than in terms of how hydrogen ions are transferred.
What is the chemist defining?
the Arrhenius concept of acids and bases
the classical concept of acids and bases
the Lewis concept of acids and bases
the Bronsted-Lowry concept of acids and bases
answer
the Lewis concept of acids and bases
question
Which term describes a substance that increases the concentration of hydroxide ions in solution?
Lewis definition of an acid
Arrhenius definition of a base
Bronsted-Lowry definition of a base
Bronsted-Lowry definition of an acid
answer
Arrhenius definition of a base
question
What is the Bronsted-Lowry definition of an acid?
a compound that donates protons
a compound that accepts protons
a substance that increases hydroxide ion concentration
a substance that increases hydronium ion concentration
answer
a compound that donates protons
question
Which statement describes the Arrhenius interpretation of acids and bases?
It has a wider range of applications than the Bronsted-Lowry interpretation.
It has a wider range of applications than the Lewis and Bronsted-Lowry interpretations.
It is used in situations that involve bases that do not produce hydroxide ions.
It is limited to situations that involve aqueous solutions or specific compounds.
answer
It is limited to situations that involve aqueous solutions or specific compounds.
question
Which statement best describes a Bronsted-Lowry base?
It must accept protons to form a conjugate base.
It must accept protons to form a conjugate acid.
It must donate protons to form a conjugate base.
It must donate protons to form a conjugate acid.
answer
It must accept protons to form a conjugate acid.
question
Which reaction displays an example of an Arrhenius base?
NaOH(s) mc005-1.jpg Na+(aq) + OH-(aq)
HCl(g) + H2O(l) mc005-2.jpg H3O+(aq) + Cl-(aq)
CH3COOH(aq) + H2O(l) mc005-3.jpg H3O+(aq) + CH3COO-(aq)
NH3(aq) + HC2H3O2(aq) mc005-4.jpg NH4+(aq) + C2H3O2-(aq)
answer
NaOH(s) mc005-1.jpg Na+(aq) + OH-(aq)
question
Consider the reaction below.
HF + H2O mc011-1.jpg H3Omc011-2.jpg + Fmc011-3.jpg
Which is an acid-conjugate base pair?
HF and H3O+
HF and Fmc011-4.jpg
H2O and HF
H2O and Fmc011-5.jpg
answer
HF and Fmc011-4.jpg
question
What is the Arrhenius definition of an acid?
A substance that increases H3O+ concentration when it is dissolved in water.
A substance that increases OH- concentration when it is dissolved in water.
A compound that donates protons.
A compound that accepts protons.
answer
A substance that increases H3O+ concentration when it is dissolved in water.
question
The pOH of a solution is 10.75. What is the concentration of OH- ions in the solution?
Use mc013-1.jpg.
3.162 mc013-2.jpg 10-108 M
1.778 mc013-3.jpg 10-11 M
1.075 mc013-4.jpg 102 M
5.623 mc013-5.jpg 1010 M
answer
1.778 mc013-3.jpg 10-11 M
question
A substance with a high [H+ ] would likely have which additional characteristics?
a high [OH- ] and a high pOH
a low [OH- ] and a high pOH
a high [OH- ] and a low pOH
a low [OH- ] and a low pOH
answer
a low [OH- ] and a low pOH
question
A solution containing HCl would likely have
a high pH and a low pOH.
a low pH and a high pOH.
a high pH and a high pOH.
a low pH and a low pOH.
answer
a low pH and a high pOH.
question
A substance with a high pOH would likely have which of the following?
A low [H+ ] and a high pH
A low [OH- ] and a high pH
A high [OH- ] and a low pH
A high [H+ ] and a low pH
answer
A high [OH- ] and a low pH
question
Which would most likely be the pH of a highly-corrosive acid?
1
5
8
11
answer
1
question
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 substance with a pH of 2 has a 10 times higher concentration of H+ than a substance with a pH of 3.
A substance with a pH of 3 has a 10 times higher concentration of H+ than a substance with a pH of 2.
A substance with a pH of 2 has a 100 times higher concentration of H+ ions than a substance with a pH of 3.
A substance with a pH of 3 has a 100 times higher concentration of H+ ions than a substance with a pH of 2.
answer
A substance with a pH of 2 has a 10 times higher concentration of H+ than a substance with a pH of 3.
question
What is the pH of a solution with [H+] = 1.25 mc015-1.jpg 10-10 M?
Use mc015-2.jpg.
-10.1
-9.90
7.90
9.90
answer
9.90
question
Which statement about the self-ionization of water is correct?
Two water molecules interact to form a water molecule and a hydroxide ion.
Two water molecules interact to form a hydronium ion and a hydroxide ion.
Two water molecules interact to form two hydronium ions.
Two water molecules interact to form two hydroxide ions.
answer
Two water molecules interact to form a hydronium ion and a hydroxide ion.
question
Note the pH and pOH values labeled with letters on the pH scale below.
mc023-1.jpg
Based on log rules and the way pH is calculated, what is the difference in [OH- ] concentration between point A and point B.
101
105
106
107
answer
106
question
The pH of a solution decreases by 2.0. How does the hydronium ion concentration of the solution change?
increases to 2 times the original concentration
increases to 100 times the original concentration
decreases to mc009-1.jpg of the original concentration
decreases to mc009-2.jpg of the original concentration
answer
increases to 100 times the original concentration
question
Several substances are labeled on the pH scale below.
mc025-1.jpg
Which substance has the lowest [H+] concentration but is still considered an acid?
milk
blood
gastric fluid
household lye
answer
milk
question
How does litmus paper identify a base?
A base turns red litmus blue.
A base turns blue litmus red.
A base turns orange litmus red.
A base turns yellow litmus blue.
answer
A base turns red litmus blue.
question
Which characteristic best identifies an Arrhenius base?
It must donate electrons to form a covalent bond.
It must accept protons from an acid.
It must generate hydroxide ions in water.
It must form a conjugate acid after reacting.
answer
It must generate hydroxide ions in water.
question
Which of these equations correctly expresses the self-ionization of water?
mc002-1.jpg
mc002-2.jpg
mc002-3.jpg
mc002-4.jpg
answer
mc002-4.jpg
question
Four different solutions (I, II, III, and IV) are labeled on the pH scale below.
mc026-1.jpg
Why would solution IV be considered the most concentrated base out of the four substances?
It has the highest concentration of hydrogen ions.
It has the highest concentration of hydronium ions.
It has the highest concentration of oxide ions.
It has the highest concentration of hydroxide ions.
answer
It has the highest concentration of hydroxide ions.
question
The pH of lemon juice at 298 K is found to be 2.32. What is the concentration of mc014-1.jpg ions in the solution?
Use mc014-2.jpg.
mc014-3.jpg
mc014-4.jpg
mc014-5.jpg
mc014-6.jpg
answer
mc014-4.jpg
question
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?
Arrhenius base
Arrhenius acid
Bronsted-Lowry base
Bronsted-Lowry acid
answer
Arrhenius acid
question
A compound accepts electrons from another substance to form a covalent bond. Which term best describes this compound's behavior?
Lewis acid
Arrhenius base
Bronsted-Lowry acid
Bronsted-Lowry base
answer
Lewis acid
question
What is the Arrhenius definition of a base?
A substance that increases H3O+ concentration when it is dissolved in water.
A substance that increases OH- concentration when it is dissolved in water.
A compound that donates protons.
A compound that accepts protons.
answer
A substance that increases OH- concentration when it is dissolved in water.
question
Why is citric acid added to food?
to add color
to add tartness
to add bitterness
to add sweetness
answer
to add tartness
question
An acid is a substance that increases the concentration of H3O+ ions in solution. Look at the reaction below of phenol (C6H5OH) with water:
mc023-1.jpg
Which reactant acts as an acid by contributing a H+ ion to create H3O+ in the chemical equation?
C6H5OH(aq)
H2O(l)
C6H5O-(aq)
H3O+(aq)
answer
C6H5OH(aq)
question
An unknown substance turns methyl orange solution red. This shows that the substance
is a base.
is water.
is an acid.
is an alkaloid.
answer
is an acid.
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