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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.
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.
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.
Which of the following is the 
temperature at which ice 
melts? 
A. 0 Kelvin 
B. 0o Fahrenheit 
C. 0o Celsius 
D. 0 Gram
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.
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.
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.
Which of the following is the 
temperature at which ice 
melts? 
C. 0o Celsius 
Correct 
The Celsius scale uses 0o as 
the melting point.
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
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.
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.
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.
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.
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
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
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
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
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
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.
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.
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.
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.

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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.