Roosevelt High School
Unit 3 Heating Curves
CP Physical Science
Name_____________________
Period___ Date____/____/___
Interpreting Heating Curves
Substance X: The heating curve below is for substance X. Complete the questions
below the heating curve.
Heat
1. Label each of the arrows on the heating curve with one of the following words:
boiling
melting
freezing
condensing
2. On the curve, clearly label the following areas: A. Solid B. Liquid C. Gas.
3. What is the boiling point of substance X?
4. What is the freezing point of substance X?
5. What is the melting point of substance X?
6. What state(s) is substance X at 175°C?
7. What state(s) is substance X at 100°C?
8. What state(s) is substance X at -90°C?
Roosevelt High School
Unit 3 Heating Curves
CP Physical Science
Name_____________________
Period___ Date____/____/___
9. Assuming that a single particle of substance X could be drawn as a
, sketch a
picture of substance X between -50℃ and 50℃ and between 50℃ and 100℃ in the
beakers below.
-50℃ and 50℃
50℃ and 100℃
Substance Y
B
1. What two physical states of substance Y are present between B and C?
2. What two physical states of substance Y are present between D and E?
Roosevelt High School
Unit 3 Heating Curves
CP Physical Science
Name_____________________
Period___ Date____/____/___
For 3-6, name the phase change and state whether it is exothermic or endothermic.
Number
Phase Change
Exothermic or Endothermic
3. B → C
4. C → B
5. D → E
6. E → D
7. Why is the heating curve for substance Y flat between B and C?
8. Describe how the particles in substance Y change between A and B?
9. The freezing point of ethanol is –114°C, and the boiling point is 78°C. Draw a
heating curve for ethanol below, starting at -150°C and ending at 150°C.
150°C
Temperature (°C)
100°C
50°C
0°C
-50°C
-100°C
-150°C