melting points and boiling points

1. Melting points
and boiling
points

2. Melting and Boiling Points
The melting point is the temperature at which a
substance changes from a ............ to a ..............
The boiling point is the temperature at which a
substance changes from a ............ to a ..............
Water melts at .....°C and boils at ...... °C.
liquid
solid liquid
gas
0 100

3. Which state?
What is the physical state of water at these
temperatures?
45 °C ...............
125 °C ...............
-23 °C ...............
75 °C ...............
solid
liquid
liquid
gas

4. Which state?
Think of it like this:
0°C 100°C
solid
(ice)
liquid
(water)
steam
(gas)
m.p. b.p.

5. Which state?
What state of matter is water at 56°C?
0°C 100°C
m.p. b.p.
56°C
liquid

6. Which state?
What state of matter is water at 125°C?
0°C 100°C
m.p. b.p.
125°C
gas

7. Which state?
What state of matter is water at -6°C?
0°C 100°C
m.p. b.p.
-6°C
solid

8. Now you try
Here are the melting and boiling points of
some elements. What state are they at 25 °C?
Element m.p./°C b.p./°C State at
25°C
Chlorine -101 -34
Iodine 114 184
Fluorine -220 -188
Bromine -7 59
solid
gas
gas
liquid

9. In your books
Copy and complete the table to show the state
of these elements at -50°C.
Element m.p./°C b.p./°C State at
25°C
Chlorine -101 -34
Iodine 114 184
Fluorine -220 -188
Bromine -7 59
solid
liquid
gas
solid

10. In your books
Copy and complete the table to show the state
of these elements at -50°C.
Element m.p./°C b.p./°C State at
25°C
Chlorine -101 -34
Iodine 114 184
Fluorine -220 -188
Bromine -7 59
solid
liquid
gas
solid