Question

a. there are three statements beside each picture. write t or f in the space for each statement. 1. the phase change shown is from gas to liquid. 2. water changes phase at its boiling point. 3. when the water boils, gas bubbles form below the surface. 1. the phase change shown is from solid to liquid. 2. the phase change occurs at the melting point. 3. the phase change occurs at any temperature. b. write sublimation, evaporation, or condensation on the line near each picture or pair of pictures.

Explanation:

For part A:

• In the first picture of boiling water, the phase - change is from liquid to gas, not gas to liquid. Water changes phase at its boiling point and bubbles form below the surface when it boils.
• In the second picture of melting ice, the phase - change is from solid to liquid at the melting point and not at any temperature.

For part B:

• The first picture shows water turning into vapor under the sun, which is evaporation.
• The second picture shows ice in a glass with water droplets on the outside, which is condensation (water vapor in the air condenses on the cold glass).
• The third picture shows ice forming on a window at a low temperature, which is deposition (water vapor directly turns into ice, but if we consider the reverse process of sublimation in a general sense of phase - change identification, we can think of it in terms of the concepts).

Answer:

A.

1. F
2. T
3. T
4. T
5. T
6. F

B.

1. Evaporation
2. Condensation
3. Sublimation (reverse process related to the ice - formation on window)