Motion energy and stored energy of particles

Answer Key - Grade 11 Science Worksheet

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

1. 1.

   A gas is warmed from 27 °C to 327 °C. To the nearest hundredth, how many times larger is its particles' average kinetic energy, Ari?

   2 times
2. 2.

   A gas is warmed from 20 °C to 80 °C. To the nearest hundredth, how many times larger is its particles' average kinetic energy, Bo?

   1.2 times
3. 3.

   A gas is warmed from 10 °C to 50 °C. To the nearest hundredth, how many times larger is its particles' average kinetic energy, Esme?

   1.14 times
5. 4.

   In the energy bar chart, which store does the energy go into as the ice melts, Jun?

   • Particle kinetic energy, so the ice warms
   • Neither, since melting needs no energy
   • Particle potential energy
6. 5.

   In the energy bar chart, why does the temperature stay at 0 °C while the ice melts, Kira?

   Use the picture in question 4.

   • No energy goes in
   • The particles speed up, but the thermometer can't tell
   • The particles' average motion energy doesn't change
8. 6.

   In the heating-curve graph, what is happening along the first flat part, Milo?

   • The ice is warming up
   • The ice is melting
   • The water is boiling
9. 7.

   In the heating-curve graph, which particle store grows along the flat parts, Noah?

   Use the picture in question 6.

   • Particle kinetic energy
   • Neither, since the temperature is flat
   • Particle potential energy
10. 8.

    A rubber band is stretched. At the particle scale, why does it store energy, Ren?

    • Its particles move faster
    • Its particles are pulled from their usual positions
    • It gains particles
11. 9.

    A hand-warmer packet heats up as its iron powder reacts with air. Where did the energy come from, Tala?

    • Particle potential energy in bonds and arrangements
    • Sunlight stored in the air
    • The packet's motion
12. 10.

    Water evaporates from a warm dish. Why does the water left behind cool, Zee?

    • Evaporation adds energy to the water
    • The particles left behind grow bigger
    • The fastest particles leave, lowering the average