Question

1. what is condensation? 4. explain condensation on a cold glass 5. what changes? 6. what remains the same? 7. how does adding/removing energy affect particles?

Explanation:

1. Condensation is the process by which a gas changes into a liquid when it loses heat energy. For example, when warm, moist air cools down, the water - vapor in it condenses into tiny liquid water droplets.
2. When there is a cold glass, the warm, moist air around it comes into contact with the cold surface. The air near the glass cools down. As a result, the water - vapor in the air loses energy and condenses into liquid water droplets on the surface of the cold glass.
3. During condensation, the state of matter changes from gas to liquid. The energy of the water - vapor decreases as it condenses. Also, the temperature of the air near the cold surface decreases.
4. The chemical composition of the substance remains the same. Whether it is water - vapor or liquid water, it is still composed of H₂O molecules.
5. Adding energy to particles makes them move faster and spread out more. For example, heating water turns liquid water into water - vapor as the particles gain enough energy to break free from the liquid state. Removing energy makes particles move slower and come closer together, as in the case of condensation where water - vapor loses energy and becomes liquid water.

Answer:

1. Condensation is the change of a gas to a liquid upon losing heat energy.
2. Warm, moist air cools on contact with the cold glass, causing water - vapor in the air to condense into liquid droplets on the glass surface.
3. State of matter changes from gas to liquid, energy of water - vapor decreases, and temperature of nearby air decreases.
4. Chemical composition (molecules remain H₂O).
5. Adding energy makes particles move faster and spread out; removing energy makes them move slower and come closer together.