Final Answer:
1) D
2) B
3) A, C
4) Sublimation
5) A, C, E
6) B, D
7) During a phase change, energy increases but the temperature stays the same.
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Explanation:
Let’s go step by step:
1)
Which letter represents the phase change from gas to liquid?
Gas → liquid is called *condensation*. Look for the arrow going from “Gas” down to “Liquid”. That’s labeled
D.
2)
Which letter represents the phase change from liquid to solid?
Liquid → solid is *freezing*. The arrow from “Liquid” to “Solid” is labeled
B.
3)
Which letters represent melting? Which represent boiling?
- Melting = solid → liquid → that’s arrow
A.
- Boiling (or vaporization) = liquid → gas → that’s arrow
C.
4)
Which phase change is represented by arrow labeled E?
Arrow
E goes directly from Solid → Gas. That’s *sublimation* (like dry ice turning into gas).
5)
Which letters represent phase changes where the substance is absorbing heat?
When a substance absorbs heat, it changes to a *more energetic* state:
- Solid → Liquid (melting, A)
- Liquid → Gas (boiling, C)
- Solid → Gas (sublimation, E)
So:
A, C, E
6)
Which letters represent phase changes where the substance is losing heat?
Losing heat means going to a *less energetic* state:
- Gas → Liquid (condensation, D)
- Liquid → Solid (freezing, B)
So:
B, D
7)
Based on the diagram, what happens to temperature during a phase change?
The horizontal lines (flat parts) on the temperature graph show that even though energy is added (or removed), the temperature *doesn’t change* until the phase change is complete. So:
During a phase change, energy increases but the temperature stays the same.
Parent Tip: Review the logic above to help your child master the concept of phase change of water worksheet.
