Question

understanding phase changes
in science, matter can change from one state to another when physical conditions are met. the physical state of matter can undergo changes due to heating, cooling, or pressure changes. understanding these changes helps us make sense of many everyday phenomena.

phase change	scenario	energy	effect
	water was placed in the freezer overnight. the freezer temperature is below 0°c.
	a puddle disappears on a sunny day. the ground is turning dry.
	water droplets form on the outside of a cold glass. <br> warm air meets the cold surface of the glass. water vapor turns into liquid.
	dry ice (solid co₂) when exposed to air. the solid co₂ absorbs heat from the surrounding air and turns directly into gas.

go to the board fill in the table with the correct terms: freezing, melting, sublimation, condensation, evaporation

Explanation:

To solve this, we analyze each scenario and match it to the correct phase change:

1. All the water in the fridge turned into ice (liquid to solid)

• Phase Change: Freezing

2. Water was placed in the freezer overnight (liquid to solid)

• Phase Change: Freezing

3. A puddle disappeared on a sunny day (liquid to gas, without passing through solid)

• Phase Change: Evaporation (or Sublimation? Wait, puddle is liquid water. So liquid → gas: Evaporation. If it were solid (like ice) to gas, it’s Sublimation. But puddle is liquid, so Evaporation.)

4. Water droplets forming on the outside of a cold glass (gas to liquid)

• Phase Change: Condensation

5. Dry ice producing fog when exposed to air (solid to gas, no liquid phase)

• Phase Change: Sublimation

6. (Wait, the 4th row: “Water droplets forming on the inside of a cold glass… Wait, no, the text: “Water droplets forming on the inside of a cold glass (wait, no, original: “Water droplets forming on the inside of a cold glass? Wait, no, the user’s image: “Water droplets forming on the inside of a cold glass? Wait, no, let's recheck:

Wait, the 4th row: “Water droplets forming on the outside of a cold glass (gas to liquid: Condensation). Wait, maybe I misread. Let's list all with correct phase changes:

Scenario	Phase Change
Water was placed in the freezer overnight (liquid → solid)	Freezing
A puddle disappeared on a sunny day (liquid → gas)	Evaporation
Water droplets forming on the outside of a cold glass (gas → liquid)	Condensation
Dry ice producing fog (solid CO₂ → gas CO₂, no liquid)	Sublimation

Wait, the 4th row in the image: “Water droplets forming on the inside of a cold glass? No, likely “outside”. Cold glass cools air, water vapor (gas) condenses to liquid (droplets) on the outside. So Condensation.

Final Answers (matching each scenario to phase change):

1. Freezing
2. Freezing
3. Evaporation
4. Condensation
5. Sublimation

(Note: If there are 5 scenarios, match each to Freezing, Freezing, Evaporation, Condensation, Sublimation as above.)

Answer:

To solve this, we analyze each scenario and match it to the correct phase change:

1. All the water in the fridge turned into ice (liquid to solid)

• Phase Change: Freezing

2. Water was placed in the freezer overnight (liquid to solid)

• Phase Change: Freezing

3. A puddle disappeared on a sunny day (liquid to gas, without passing through solid)

• Phase Change: Evaporation (or Sublimation? Wait, puddle is liquid water. So liquid → gas: Evaporation. If it were solid (like ice) to gas, it’s Sublimation. But puddle is liquid, so Evaporation.)

4. Water droplets forming on the outside of a cold glass (gas to liquid)

• Phase Change: Condensation

5. Dry ice producing fog when exposed to air (solid to gas, no liquid phase)

• Phase Change: Sublimation

6. (Wait, the 4th row: “Water droplets forming on the inside of a cold glass… Wait, no, the text: “Water droplets forming on the inside of a cold glass (wait, no, original: “Water droplets forming on the inside of a cold glass? Wait, no, the user’s image: “Water droplets forming on the inside of a cold glass? Wait, no, let's recheck:

Wait, the 4th row: “Water droplets forming on the outside of a cold glass (gas to liquid: Condensation). Wait, maybe I misread. Let's list all with correct phase changes:

Scenario	Phase Change
Water was placed in the freezer overnight (liquid → solid)	Freezing
A puddle disappeared on a sunny day (liquid → gas)	Evaporation
Water droplets forming on the outside of a cold glass (gas → liquid)	Condensation
Dry ice producing fog (solid CO₂ → gas CO₂, no liquid)	Sublimation

Wait, the 4th row in the image: “Water droplets forming on the inside of a cold glass? No, likely “outside”. Cold glass cools air, water vapor (gas) condenses to liquid (droplets) on the outside. So Condensation.

Final Answers (matching each scenario to phase change):

1. Freezing
2. Freezing
3. Evaporation
4. Condensation
5. Sublimation

(Note: If there are 5 scenarios, match each to Freezing, Freezing, Evaporation, Condensation, Sublimation as above.)