easy · Enhanced ACT science

A heater is used to raise the temperature of a block of ice from -10^circC to 0^circC.

Which statement correctly describes the molecules in the ice during this process?

  1. The molecules stop moving entirely because ice is a rigid solid structure.
  2. The molecules begin to move further apart, immediately turning the solid into a liquid.
  3. The number of protons in each water molecule increases due to the added heat energy.
  4. The kinetic energy of the molecules increases, causing them to vibrate faster.

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