Question

How is energy related to the change of state represented

by the model?
Atoms gain energy as a solid changes to a liguid
Atoms gain energy as a solid changes to a gas,
Atoms lose energy as a solid changes to a liquid
Atoms lose energy as a solid changes to a gas

Answer 1

Atoms gain energy as a solid change to a liquid

Atoms gain energy as a solid change to a gas

Explanation:

• The change of phase of a substance involves the absorption or release of the energy by the atoms.
• When a substance in a solid-state is converted into liquid. The energy is absorbed by the atoms of the substance. That is why the metals need to be heated to convert it into liquid. When the substance recover its original phase, the absorbed energy is released
• When a substance in the liquid state is heated it transforms into the vapor state. The vapors need to be cooled to convert back to the liquid state.

Answer 2

Answer: Atoms gain energy as a solid changes to a liguid

Explanation: In the image, we can see how a thing with a defined shape changes into something with an undefined shape, that can be liquid or gas, let's suppose that it is a liquid because it accumulates at the bottom.

Usually, as you heat a solid, it will reach his fusion point, which is the temperature at which the solid start to change his state from solid to liquid.

As the solid increases its temperature, the energy of the atoms increases (because heat is a form of energy).

Then as the solid changes to liquid, atoms gain energy, because their temperature must increase.

In the case of gas, the situation is the same, atoms gain energy as the solid changes to a gas.