Explanation:

Condensing and Evaporating:
- Condensing is the process by which a substance changes from a gas to a liquid state, usually by cooling. This occurs when the particles of the gas slow down and come together to form a liquid.
- Evaporating, on the other hand, is the process by which a substance changes from a liquid to a gas state, usually by heating. This occurs when the particles of the liquid gain enough energy to break free and become a gas.

Opposites:
- Condensing and evaporating are indeed opposite processes. When a substance condenses, it goes from a gas to a liquid state, whereas when it evaporates, it goes from a liquid to a gas state. These processes are reverse of each other and involve opposite changes in the state of matter.

Freezing and Melting:
- Freezing is the process by which a substance changes from a liquid to a solid state, usually by cooling. This occurs when the particles of the liquid slow down and come together to form a solid.
- Melting, on the other hand, is the process by which a substance changes from a solid to a liquid state, usually by heating. This occurs when the particles of the solid gain enough energy to break free and become a liquid.

Opposites:
- Freezing and melting are indeed opposite processes. When a substance freezes, it goes from a liquid to a solid state, whereas when it melts, it goes from a solid to a liquid state. These processes are reverse of each other and involve opposite changes in the state of matter.