Question

(7th) u2 - heat curve of water
questions 1 - 21. use the heat curve of water below to answer the following questions. you do not need to use complete sentences.

1. what is heat?
2. what is temperature?
3. what do the plateaus (flat lines) on the curve represent?
4. what does a represent?
5. what does b represent?
6. what does c represent?
7. what does d represent?
8. what does e represent?
9. what does f represent?
10. what does g represent?
11. when heat increases, what happens to the kinetic energy?
12. there are only two temperatures in this heat curve of water.

a. what is the importance of 0°c?
b. what is the importance of 100°c?

Explanation:

1. Heat is a form of energy transferred between substances due to a temperature difference.
2. Temperature is a measure of the average kinetic energy of the particles in a substance.
3. The plateaus represent phase - changes (melting and boiling) where heat is used for changing the state rather than increasing temperature.
4. A represents the boiling of water (vaporization), where water changes from liquid to gas while temperature remains constant.
5. B represents the melting of ice, where ice changes from solid to liquid at 0°C.
6. C represents the heating of steam (water in gas phase) after all water has vaporized.
7. D represents the heating of liquid water from 0°C to 100°C.
8. E represents the heat of vaporization, the amount of heat required to change liquid water to steam at 100°C.
9. F represents the increase in temperature of liquid water as heat is added.
10. G represents the heat of fusion, the amount of heat required to change ice to liquid water at 0°C.
11. When heat increases, the kinetic energy of the particles increases (except during phase - changes).
12. a. 0°C is the melting point of ice and freezing point of water, where solid and liquid phases co - exist.

b. 100°C is the boiling point of water at standard atmospheric pressure, where liquid and gas phases co - exist.

Answer:

1. A form of energy transferred due to temperature difference.
2. Measure of average kinetic energy of particles.
3. Phase - changes (melting and boiling).
4. Boiling (vaporization) of water.
5. Melting of ice.
6. Heating of steam.
7. Heating of liquid water from 0°C to 100°C.
8. Heat of vaporization.
9. Increase in temperature of liquid water.
10. Heat of fusion.
11. Increases (except during phase - changes).
12. a. Melting point of ice and freezing point of water.

b. Boiling point of water at standard atmospheric pressure.