Question

1. what is it called when a liquid turns into a gas?

a. melting
b. freezing
c. boiling
d. condensation
e. none of the above

Explanation:

• Option a: Melting is when a solid turns to a liquid.
• Option b: Freezing is when a liquid turns to a solid.
• Option c: Boiling is the process of a liquid turning into a gas (vaporization, with boiling being a specific type of vaporization).
• Option d: Condensation is when a gas turns to a liquid.

Since boiling is the process of a liquid turning into a gas, option c is correct. But wait, actually, the general term for a liquid turning into a gas is vaporization, and boiling is a form of vaporization (when it occurs at the boiling point). However, among the given options, "Boiling" (option c) is the closest as the other options are incorrect. But actually, the correct general term for liquid to gas is vaporization, but since "None of the Above" is an option, let's re - evaluate:
Wait, no. Boiling is a type of vaporization (liquid to gas). Let's check the options again:

• Melting: solid→liquid (wrong)
• Freezing: liquid→solid (wrong)
• Boiling: liquid→gas (correct, as boiling is a process where liquid turns to gas)
• Condensation: gas→liquid (wrong)

So the correct option is c. But wait, actually, the phase change from liquid to gas is called vaporization. Boiling is a specific case of vaporization (when it happens at the boiling temperature throughout the liquid). But among the given options, "Boiling" is the option that represents liquid to gas change. So the answer should be c? Wait, no, maybe I made a mistake. Wait, the question is "What is it called when a liquid turns into a gas?". The general term is vaporization. But the options have "Boiling" (which is a type of vaporization) and "None of the Above". Let's check the options again:
a. Melting: solid to liquid - wrong.
b. Freezing: liquid to solid - wrong.
c. Boiling: liquid to gas (boiling is a process of liquid turning to gas) - correct.
d. Condensation: gas to liquid - wrong.
So the correct option is c. But wait, some sources say that the phase change from liquid to gas is vaporization, and boiling is a form of vaporization. But in the context of this question, among the given options, c is the best choice. Wait, no, maybe the answer is e? Wait, no. Let's think again. Boiling is when a liquid turns into a gas (at the boiling point). So if the question is about the process of liquid turning to gas, boiling is one of the processes (the other is evaporation, which is at the surface). But since the options include boiling, and the other options are wrong, c is correct.

Answer:

c. Boiling