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Topic 1 – Matter and Energy

10. Phase change diagrams: Determining boiling, melting and freezing

Answer questions 1 – 3 based on the graph below.
The graph below represents a uniform heating of a substance, starting with the substance as a
solid below its melting point.

1. What is the melting point of this substance? o o
o
o
1) 0 C 2) 12 C 3) 60 C 4) 100 C

2. What is the boiling point of the substance? o o o
o
1) 100 C 2) 60 C 3) 12 C 4) 0 C

3. The freezing point of the substance is o o o
o
1) 100 C 2) 0 C 3) 60 C 4) 12 C

Answer question 4 – 6 based on the graph below.
The graph below represents a uniform cooling of a substance starting with the substance as a gas
above its boiling point.
Need Help? Study Book Pg 13 Set 20

4. What is the freezing point of this substance?
1) 60 C 2) 10 C 3) 150 C 4) 100 C
o
o
o
o

5. What is the boiling point of the substance?
o
o
o
o
1) 150 C 2) 100 C 3) 60 C 4) 10 C

6. The melting point of the substance is
o
o
o
o
1) 100 C 2) 10 C 3) 100 C 4) 60 C

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