Read a heating curve: what happens during melting and boiling

Answer Key - Grade 10 Science Worksheet - Challenge Me

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

1. 1.

   Using 2.09, 334, 4.18 and 2260 J/g values, how much energy turns 10 g of ice at −20 °C into steam at 100 °C, to 0.1 J, Ari?

   30,538 J
2. 2.

   Using 2.09, 334, 4.18 and 2260 J/g values, how much energy turns 2 g of ice at −20 °C into steam at 100 °C, to 0.1 J, Bo?

   6107.6 J
3. 3.

   Why does boiling 1 g of water take 2260 J but melting 1 g of ice only 334 J, Jun?

   • Ice has more particles
   • Boiling happens at a lower temperature
   • Boiling pulls particles fully apart
4. 4.

   The same heat goes into 1 g of ice and 1 g of water. Which warms more, Kira?

   • The ice, with the lower specific heat
   • They warm the same
   • The water, with the higher specific heat
5. 5.

   About how many times more energy does boiling 1 g of water take than melting 1 g of ice, Luz?

   • About 2 times
   • About 7 times
   • About 70 times
6. 6.

   Milo says melting ice warms up the whole time it melts. Agree or disagree?

   • Disagree: it holds at 0 °C
   • Agree: heat must raise the temperature
   • Agree: it warms as it softens
7. 7.

   Noah says turning up the heat makes boiling water hotter than 100 °C at 1 atm. Agree or disagree?

   • Disagree: it boils faster at 100 °C
   • Agree: more heat, higher temperature
   • Agree: it reaches 150 °C
8. 8.

   Drops form on the outside of a glass of ice water. What phase change is this, Ren?

   • Melting of the glass
   • The glass leaking
   • Condensation of water vapor
9. 9.

   Ice cubes left for weeks in a freezer slowly shrink. What phase change is this, Tala?

   • Melting
   • Sublimation
   • Condensation
10. 10.

    A wet towel dries on a line. Where does the energy for evaporation come from, Zee?

    • The towel's color
    • The water makes its own
    • The surroundings, such as warm air