Oops! I forgot Objective 4! Here it is.
Objective 4:
1. A change in temperature causes matter to change state.
2. As the thermal energy in something increases the particles start going crazy and bouncing all around. If it's a solid, then it turns into a liquid. If it's a liquid, (like boiling water) then it turns into a gas.
3. When the matter is changing state, the temperature is being put into the process of the change, so it stays the same. When the matter is not changing state. the energy is being put into raising the temperature.
4. A solid changes state because when it gets heated up, the particles start moving around and heating up.The thermal energy causes it to melt.
5. The potato will generate steam and the steam might a really high pressure inside the potato so it might explode.
Citations:
http://wiki.answers.com/Q/Why_does_the_temperature_of_matter_remain_the_same_while_the_matter_changes_state
http://wiki.answers.com/Q/Why_should_you_poke_holes_in_a_potato_before_baking_it
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