Chapter22 / Solutions
Q1) Choose the correct the answer:
1. In a solution, the substance that is being dissolved is the _____.
a. solute
b. solvent
c. liquid
d. gas
2. The air that you breathe is an example of a(n) _____ solution.
a. gaseous
b. solid
c. liquid
d. amalgam
3. An alloy is an example of a _____ solution.
a. gaseous
b. liquid
c. solid
d. dilute
4. A solution that contains all of the solute it can normally hold at a given temperature
is _____.
a. dilute
b. unsaturated
c. supersaturated
d. saturated
5. Increasing the surface area of a solid _____.
a. slows the speed of dissolving
b. has no effect on the speed of dissolving
c. increases the speed of dissolving
d. causes the solid to ionize
6. The solubility of a gas in a liquid occurs faster if the liquid is _____.
a. heated
c. under low pressure
b. cooled
d. an electrolyte
7. The concentration of a solution that contains a large amount of solute in the solvent could
be described as _____.
a. unsaturated
b. polar
c. concentrated
d. dilute
8. Adding more solute to a solvent _____.
a. raises its freezing point
c. raises its boiling point
b. lowers its boiling point
d. does not affect its boiling point
9. A substance that does not conduct an electric current when it forms a solution
is a(n) _____.
a. electrolyte
c. polar substance
b. nonelectrolyte
d. salt
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10. The process by which the particles in a crystal are separated and drawn into solution by
water is called _____.
a. ionization
b. dissociation
c. polarity
d. saturation
11. what term is not appropriate to use when describing solutions?
a. heterogeneous
b. liquid
c. gaseous
d. solid
12. what can increase to make a gas more soluble in a liquid?
a. particle size
b. stirring
c. pressure
d. temperature
13. If a solute crystallizes out of a solution when a seed crystal is added, what kind of solution
is it?
a. unsaturated
b. saturated
c. super saturated
d. dilute
Q2) List possible ways that phases of matter could combine to form a solution?
Solid-soild
Solid-liquid
Liquid – liquid
Gas-liquid
Gas-gas
Q3) What is the effect of increasing temperature on the rate of dissolving?
Increasing the temperature will increase the solubility, because tyemperature will increase
the movement of particle sand makes more solvent bump into solute.
Q4) Describe how the metal atoms in an alloy are mixed?
……BY melting solute and solvent metals together
Q5) How do water molecules help sugar molecule dissolve?
Step 1. Moving water molecules cluster around the sugar molecules as their negative ends are
attracted to the positive ends of the sugar molecules.
Step 2. Water molecules pull the sugar molecules into solution.
Step 3. Water molecules and sugar molecules spread out to form a homogeneous mixture.
Q6) Why does stirring increase the rate at which a solute dissolves into a solvent?
because it brings more fresh solvent into contact with more solute
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Q7) How does crystal size affect the rate at which solute can be dissolved?
It increases the surface are of solute
Q8) Identify the type of the solution if, at 35°C, solute continuous to dissolve as you add more.
Unsaturated Solution
Q9) answers:
1- 70 gm
2- Saturated.
3- .
4- 50 degrees
5- NaCl
6- 46 gm
7- Unsaturated
8- KBr
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Q10 ) Compare between dissociation and ionization.
Dissociation
1- When ionic compounds dissolve to
produce ions
2- Its solution is electrolyte
ionization
1- When molecular compounds dissolve in
water to produce ions.
2- Its solution is electrolyte
Q11) Contrast electrolytes and nonelectrolytes.
Electrolytes
The compounds that produce solutions of
ions that conduct electricity in water.
Example: NaCl ( Sodium Chloride)
Nonelectrolytes
Substances that form no ions in water and
cannot conduct electricity.
Example: Sucrose and Ethyl Achol
Q12) what kinds of solute particles are present in water solutions of electrolytes and
nonelectrolytes.
In electrolyte solution: ions
In non electrolyte solution: molecules
Q13) What will happen to the boiling point of a solution when 10g of a salt are added?
The boiling point will increase
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