Can anybody me with this physics questions? (due tomorrow) (will mark brainlist)

The chain goes:

gas ---> liquid ---> solid

Whenever you move left on the chain, heat added.  Whenever you move right, heat is removed.

1. Solid to liquid; heat added

Liquid to solid; heat removed

Liquid to gas; heat added

Gas to liquid; heat removed

2. Solid to liquid; melting

3. a) Liquid to gas; vaporization

b) Liquid to solid; freezing

c) Gas to liquid; condensation

d) Solid to gas; sublimation

4. Water gets into the air by evaporation.  When water is in the air, it is in a gas phase.

5. That one is on you.

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27