Melting and boiling points

1. TEKS 5.5B
The student knows that matter has
measurable physical properties and
those properties determine how
matter is classified, changed, and
used.
The student is expected to:
identify the boiling and
freezing/melting points of water on
the Celsius scale.

2. Boiling point is the temperature
at which something becomes a
gas.
Water has a boiling
point of 100° C.
This means that at
100° C, water
changes from a liquid
to a gas.

3. Melting point is the temperature
at which something becomes a
liquid.
Water has a
melting point of 0°
C.
This means that at
0° C, water
changes from a
solid to a liquid.

4. Which of the following is the
temperature at which ice
melts?
A. 0 Kelvin
B. 0o Fahrenheit
C. 0o Celsius
D. 0 Gram

5. Which of the following is the
temperature at which ice
melts?
A. 0 Kelvin
Incorrect
Kelvin is the measurement
unit that includes absolute
zero. The temperature would
have to be 274 K for ice to
melt.

6. Which of the following is the
temperature at which ice
melts?
B. 0o Fahrenheit
Incorrect
Fahrenheit is the
measurement unit that is
traditional in the U. S. The
temperature would have to
be 32o F for ice to melt.

7. Which of the following is the
temperature at which ice
melts?
D. 0 Gram
Incorrect
A Gram (g) is the
measurement unit used to
represent mass – not
temperature.

8. Which of the following is the
temperature at which ice
melts?
C. 0o Celsius
Correct
The Celsius scale uses 0o as
the melting point.

9. If you are camping at sea level
and want to boil water so it will
be safe to drink, what
temperature will it need to
reach?
A. 15 K
B. 100o C
C. 100o F
D. 150 g

10. If you are camping at sea level and
want to boil water so it will be safe
to drink, what temperature will it
need to reach?
A. 15 K
Incorrect
Kelvin is the measurement unit
that includes absolute zero. The
temperature would have to be
373o K for water to boil.

11. If you are camping at sea level and
want to boil water so it will be safe
to drink, what temperature will it
need to reach?
C. 100o F
Incorrect
Fahrenheit is the measurement
unit that is traditional in the U.
S. The temperature would have
to be 212o F for water to boil.

12. If you are camping at sea level and
want to boil water so it will be safe
to drink, what temperature will it
need to reach?
D. 150 g
Incorrect
A gram is the measurement unit
for mass – not temperature.

13. If you are camping at sea level and
want to boil water so it will be safe
to drink, what temperature will it
need to reach?
B. 100o C
Correct
The Celsius scale uses 100o
as the boiling point for water.

14. Four students were working together
in a lab group. They had to predict the
temperature at which pure water would
boil. They recorded their predictions in
the table below.
Student Prediction
o C
1 75
2 90
3 100
4 125

15. Which student’s prediction was
the closest to the boiling point of
water?
A. Student 1
B. Student 2
C. Student 3
D. Student 4
Student Prediction
o C
1 75
2 90
3 100
4 125

16. Which student’s prediction was
the closest to the boiling point of
water?
C. Student 3
Correct
100o C is the
boiling point
of water.
Student Prediction
o C
1 75
2 90
3 100
4 125

17. Which student’s prediction was
the closest to the boiling point of
water?
A. Student 1
B. Student 2
D. Student 4
Incorrect
None of these
are the boiling
point of water on
the Celsius
scale.
Student Prediction
o C
1 75
2 90
3 100
4 125

18. Students were doing a lab to find the melting
point of ice. Which thermometer would show
the temperature in o Celsius at which ice
would begin to melt?
1 2 3 4
A. Thermometer 1
B. Thermometer 2
C. Thermometer 3
D. Thermometer 4

19. Students were doing a lab to find the melting
point of ice. Which thermometer would show
the temperature in o Celsius at which ice
would begin to melt?
1 2 3 4
The correct answer is C
because ice melts above 0o C and
the question asks at what
temperature ice would begin to
melt.

20. Students were doing a lab to find the melting
point of ice. Which thermometer would show
the temperature in o Celsius at which ice
would begin to melt?
1 2 3 4
Answer A is incorrect
because water boils at 100°
C.

21. Students were doing a lab to find the melting
point of ice. Which thermometer would show
the temperature in o Celsius at which ice
would begin to melt?
1 2 3 4
Answer B is incorrect
because the thermometer reads
50°C.

22. Students were doing a lab to find the melting
point of ice. Which thermometer would show
the temperature in o Celsius at which ice
would begin to melt?
1 2 3 4
Answer D is incorrect
because the thermometer reads -5° C.