1. 1. Loose, granular sugar dissolves much faster than a sugar cube
because the loose, granular sugar
.
A. has a greater surface area
B. has less kinetic energy
C. has a higher temperature
D. has greater surface tension
2. You can make a solute dissolve more quickly in a solvent by
.
A. adding more solute
B. adding ice
C. heating the solvent
D. removing some of the solvent
3. Water is referred to as the “universal solvent” because
.
A. it is in the liquid state through a wide range of temperatures
B. all known substances will dissolve in water
C. many different substances will dissolve in water
D. it covers two-thirds of the Earth’s surface

2. Review
• Universal solvent
• Likes dissolve likes
• Speeding up
dissolving rates

3. Speeding up the dissolving
process
1. Shaking or stirring
the solution
2. Increase the
surface area of
the solute
3. Raising the
temperature of
the solvent

4. The Affect of Changing the Solvent
Temperature on the Dissolving Rate
120
Time (sec.)
100
80
60
40
20
0
0
20
40
60
Temperature (C)
80
100

5. Solubility and Concentration
• Concentration- the
quantity (how much) of
a solute is in a solution
• Concentrated- a lot of
solute dissolved
• Dilute- a small amount of
solute dissolved

6. Solubility and Concentration
• Saturated- can not
hold any more
solute
• Unsaturated- can
hold some more
solute

7. Solubility and Concentration
•Supersaturated
•Holds more
solute than it
normally can

8. Solubility Curves
• Increasing the
temperature
increases the
dissolving rate
• It also increases the
amount of solute a
solvent can hold
We know
this from
the previous
lab!

9. Solubility Curves
•In general:
higher
temperatures
means water will
hold more solid
solutes

11. Solubility Curves
•In general:
higher
temperatures
means water will
hold less gaseous
solutes