Convert between Celsius, Kelvin and Fahrenheit

Answer Key - Grade 10 Science Worksheet - Building Confidence

Circle the best answer, or write your answer on the line.

1. 1.

   Ari's thermometer reads 5 °X in melting ice and 85 °X in boiling water. What does it read at 40 °C?

   37 °X

2. Read this first

   Reference temperatures (real data, NIST)

   point	kelvin (K)	Celsius (°C)	Fahrenheit (°F)
   absolute zero	0	−273.15	−459.67
   liquid nitrogen boils	77.36	−195.79	−320.42
   dry ice turns to gas	194.65	−78.5	−109.3
   water freezes	273.15	0	32
   a room	293.15	20	68
   water boils	373.15	100	212

3. 2.

   A freezer runs at −18 °C. What is that in kelvins, Jun?

   • −255.15 K
   • 291.15 K
   • 255.15 K
4. 3.

   A recipe says 350 °F. Which Celsius value matches, Kira?

   • About 662 °C
   • About 194 °C
   • About 177 °C
5. 4.

   How many kelvins colder is boiling liquid nitrogen than subliming dry ice, Luz?

   • 117.29 K
   • 211.12 K
   • 272.01 K
6. 5.

   Water freezes and boils 100 °C apart. How many degrees apart is that on the kelvin and Fahrenheit scales, Milo?

   • 100 on kelvin and 180 on Fahrenheit
   • 100 on kelvin and 100 on Fahrenheit
   • 373.15 on kelvin and 212 on Fahrenheit
7. 6.

   A thermometer reads 3 °C too high at every temperature. It reads 50 °C in a drink. What is the true temperature, Noah?

   • 50 °C, the reading itself, since the error is small
   • 53 °C: add the 3 °C error to the reading
   • 47 °C: subtract the 3 °C error
8. 7.

   A room warms from 20 °C to 25 °C. How big is that change in kelvins, Pia?

   • 9 K, since kelvins are 1.8 times bigger than Celsius degrees
   • 5 K, since a kelvin and a Celsius degree are the same size
   • 298.15 K, the new reading in kelvins after the change
9. 8.

   Water warms from 20 °C to 50 °C. Which temperature change goes into q = mcΔT, Ren?

   • 323.15 K
   • 70 °C
   • 30 °C
10. 9.

    Which warms 1 kg of water by the most: a rise of 10 °C, 10 K, or 10 °F, Tala?

    • 10 °F warms it most, since Fahrenheit numbers grow faster
    • 10 K warms it most, since kelvin numbers are larger
    • 10 °C and 10 K warm it equally, and both more than 10 °F

11. Reference temperatures (real data, NIST)

    point	kelvin (K)	Celsius (°C)	Fahrenheit (°F)
    absolute zero	0	−273.15	−459.67
    liquid nitrogen boils	77.36	−195.79	−320.42
    dry ice turns to gas	194.65	−78.5	−109.3
    water freezes	273.15	0	32
    a room	293.15	20	68
    water boils	373.15	100	212

12. 10.

    Which statement about 0 K is true, Zee?

    • It is the coldest anyone has reached, and colder is possible
    • It is absolute zero; nothing is colder, so kelvin readings are never negative
    • It is the freezing point of water on the kelvin scale