Take 10
Week #16
SFS-6
Solutions
Day 1 Question
1
A pharmacist mixes together
20 g of crystals of
compound A and 10 g of
crystals of compound B.
The mixture is then
dissolved in 120 mL of
water to make cough
syrup.
The mixture will most likely
dissolve fastest under
which of the following
sets of conditions?
Day 1
Question 2
When a sample of potassium chloride dissolves in
water, it separates into potassium ions and chloride
ions. Which of the following best accounts for the
positive charge of the potassium ions?
A. They have extra mass.
B. They have a large volume.
C. They have fewer electrons than protons.
D. They have a high density of neutrons and protons.
Day 1 answers
1. The mixture will most likely dissolve fastest under
which of the following sets of conditions?
2.When a sample of potassium chloride dissolves in
water, it separates into potassium ions and chloride
ions. Which of the following best accounts for the
positive charge of the potassium ions?
C. They have fewer electrons than protons.
Day 2
Question 1
Which of the following solutions has the
highest concentration of solute?
A. 1.0 mol solute in 200 mL solvent
B. 2.0 mol solute in 500 mL solvent
C. 3.0 mol solute in 1 L solvent
D. 4.0 mol solute in 1.5 L solvent
Day 2
Question 2
A crystal of table salt (NaCl) is dissolved in water.
Which of the following statements explains why the
dissolved salt does not recrystallize as long as the
temperature and the amount of water stay constant?
A. Na and Cl ions lose their charges in the water.
B. Water molecules surround the Na and Cl ions.
C. Na and Cl ions leave the water through
vaporization.
D. Water molecules chemically react with the Na and
Cl ions.
Day 2 answers
1. Which of the following solutions has the highest
concentration of solute?
A. 1.0 mol solute in 200 mL solvent
2. A crystal of table salt (NaCl) is dissolved in water.
Which of the following statements explains why
the dissolved salt does not recrystallize as long as
the temperature and the amount of water stay
constant?
B. Water molecules surround the Na and Cl ions.
Day 3
Question 1
Calcium hydroxide, Ca(OH)2, is used as a soil
conditioner in home gardens. When mixed with
water, it releases hydroxide ions.
Which of the following is the most likely pH for a
solution of calcium hydroxide and water?
A. 1
B. 3
C. 7
D. 10
Day 3 Question
2
The pH of four different solutions of common
materials is measured. Which of the following lists
the solutions in order from most acidic to most
basic?
A. battery acid, lemon juice, blood, laundry
detergent
B. lemon juice, battery acid, blood, laundry
detergent
C. laundry detergent, blood, lemon juice, battery
acid
D. battery acid, blood, laundry detergent, lemon
juice
Day 3 answers
1. Calcium hydroxide, Ca(OH)2, is used as a soil
conditioner in home gardens. When mixed with water, it
releases hydroxide ions.
Which of the following is the most likely pH for a solution
of calcium hydroxide and water?
D. 10
2. The pH of four different solutions of common materials
is measured. Which of the following lists the solutions in
order from most acidic to most basic?
A. battery acid, lemon juice, blood, laundry detergent
Day 4
Question 1
A person left a bottle of distilled water and a bottle of a sugary
drink outside overnight. In the morning, one liquid was
frozen but the other was not.
Which liquid was frozen and why did it freeze?
A. The sugary drink froze because solutions are more dense
than pure substances.
B. The distilled water froze because pure substances are more
dense than solutions.
C. The sugary drink froze because solutions have a higher
freezing point than pure substances.
D. The distilled water froze because pure substances have a
higher freezing point than solutions.
Day 4 Question
2
In the reaction of hydrobromic acid ( HBr) and
ammonia ( NH3), ammonia acts as a Brønsted
base. Which of the following ions is formed?
Day 4 answers
A person left a bottle of distilled water and a bottle of a
sugary drink outside overnight. In the morning, one
liquid was frozen but the other was not.
Which liquid was frozen and why did it freeze?
D. The distilled water froze because pure substances have a
higher freezing point than solutions.
2. In the reaction of hydrobromic acid ( HBr) and
ammonia ( NH3), ammonia acts as a Brønsted base.
Which of the following ions is formed?
Day 5 Question 1
The formula for carbonic acid is H2CO3 , and the
formula for hydrogen carbonate is HCO3.
Together they form a buffer that is found in blood.
Which of the following reactions represents what
happens when excess base enters the bloodstream?
Day 5 Question 2
A chemical equation representing the reaction of
water (HOH) and ammonia (NH3) is shown below.
Which of the following statements best explains the
chemical action of the reactants in this equation?
A. Both water and ammonia are acting as acids.
B. Both water and ammonia are acting as bases.
C. Water is acting as an acid, and ammonia is acting
as a base.
D. Water is acting as a base, and ammonia is acting as
an acid.
Day 5 answers
1. The formula for carbonic acid is H2CO3 , and the
formula for hydrogen carbonate is HCO3.
Together they form a buffer that is found in blood.
Which of the following reactions represents what
happens when excess base enters the bloodstream?
2. Which of the following statements best explains
the chemical action of the reactants in this
equation?
C. Water is acting as an acid, and ammonia is acting
as a base.