1. Week 13 1. As a substance changes from a gas to a liquid, the distance between its molecules
Increases
Decreases
Remains the same
May either increase or decrease.
2. What happens to the temperature of a solid as it melts?
It stays the same.
It increases.
It decreases.
It increases and then decreases.

2. 3. If you place a balloon in the freezer, it will
Deflate because volume is directly proportional to temperature
Deflate because volume is inversely proportional to temperature.
Expand because volume is inversely proportional to temperature.
Stay the same size because there is no relationship between volume and temperature.
4. Use the diagram to answer the question. What is the approximate temperature when this substance melts or freezes?
0 C
50 C
-10 C
100 C

3. 5. The cylinders below both contain the same number of gas molecules at the same temperature. Which of the following statements is true?
The position of the piston in cylinder A creates more pressure than the position of the piston in cylinder B
The position of the piston in cylinder B creates more pressure than the position of the piston in cylinder A
There is no way to compare the pressure in the cylinder with the information problem.
The position of the pistons does not affect the pressure within the cylinders

4. 6. How does a phase diagram indicate when a substance is changing phase?
The temperature rises during a phase change
The temperature is constant during a phase change
The temperature falls during a phase change
The temperature changes 20 C during a phase change

5. 7. Which state of matter does the term “fluid” describe?
Liquids C. Gases, liquids and plasmas
Gases and liquids D. Gases
8. In which of the following will sugar be hardest to dissolve?
Hot tea C. Hot coffee
Warm milk D. Iced tea

6. 9. Seawater contains sodium chloride and other dissolved salt
9. Seawater contains sodium chloride and other dissolved salt. Identify the term that correctly describes those dissolved salts.
mixtures c. solvents
elements d. solutes
10.Sodium chlorate (NaClO3) and potassium nitrate (KNO3) are solids at room temperature. The solubility curve for each substance is provided. What is a valid conclusion?
The solubility of these solids in water decreases as water temperature increases.
The solubility of these solids in water increases as water temperature increases.
Nitrate ions are more soluble in water than chlorate ions.
Potassium nitrate is nearly insoluble at room temperature.