1.Only thermal energy transfers; 'cold' is absence of thermal
energy
2.Temperature measures average kinetic energy; heat is energy
transfer
3.Metals conduct heat faster, so they feel cold by drawing heat from
your hand
4.Energy is conserved; it transforms between forms but total amount
stays constant
[!] STUDY GUIDE: Big Ideas
Use to answer form questions!
1.Phase changes occur when particles gain/lose enough energy to
change arrangement.
Adding energy: solid→liquid→gas. Removing energy:
gas→liquid→solid.
2.During phase changes, temperature stays constant.
Energy goes into breaking/forming bonds between particles, not
increasing motion (flat parts of heating curves).
3.Total number of atoms stays the same during phase
changes.
Mass is conserved - atoms rearrange but don't disappear
(MS-PS1-1).
SOLID+Energy→LIQUID+Energy→GAS
PHASE CHANGES: Same atoms, different arrangement = same mass
[#] KEY TERMS
Define in YOUR words
Phase Change
Change from one state to another
Melting Point
Temperature where solid becomes li…
Boiling Point
Temperature where liquid becomes g…
Conservation of Mass
Total mass stays same in changes
[?] THE PHENOMENON
Write BEFORE Hook form
Why does a balloon shrink when you put it in the freezer?
You blow up a balloon and put it in the freezer. An hour later, it
looks deflated. But when you bring it back to room temperature, it
returns to full size. What's happening to the gas particles inside?
Your initial thinking:
[>] AFTER HOOK FORM
Reflect, then continue+2 pts
I learned that...
Station 1 — Phase Change Investigation
During melting, particles...
Why temp stays flat during phase change:
Key insight:
Station 2 — Phase Diagram Analysis
How to read a phase diagram:
Triple point means...
Key insight:
[/] DAY 1 EXIT TICKET
Complete before leaving+5 pts
Q1:
When ice melts, what happens to the total number of water molecules?
Explain using conservation of mass.
Q2 (SPIRAL W3):
Why does ice take a long time to melt even when in warm water? Use
specific heat in your answer.
Confidence:
State Changes & Phase Transitions (continued)ANSWER KEY
Name:
[=]Day 2 start
Station 3 — Design a Phase Change Application
My application uses phase change to...
The phase change I'm using
(melting/freezing/evaporating/condensing):
Why this design is effective:
Key insight:
[+] MAKING CONNECTIONS
Use for Exit Ticket!
Why do sweating and evaporation cool you down? (Think about where the
energy goes.)
If you weigh ice before and after it melts completely, will the mass
change? Why or why not?
[/] DAY 2 EXIT TICKET
Final check before Science Circle+5 pts
Q1 (NEW):
Explain why the temperature of boiling water stays at 100C even as
you add more heat. Where does the energy go?
Q2 (SPIRAL W3):
Compare the thermal conductivity of the metal pot and the water
inside it. Which heats up faster and why?
Q3 (INTEGRATION):
Design a cooling vest for athletes using phase change. Explain what
material you would use, why, and how conservation of mass applies.
CHECKTEST YOUR THINKINGRate each: FALSE ← 1–2–3–4–5 → TRUE
1. Cold can transfer from one object to another
F12345T
2. Temperature and heat are the same thing
F12345T
3. Metals are naturally colder than other materials
F12345T
4. Energy can disappear or be used up
F12345T
5. Only thermal energy transfers; 'cold' is absence of thermal energy
F12345T
Pick any TWO statements — especially any you rated 2, 3, or 4. Justify your rating with evidence:
Statement #___ — I rated it ___ because:
Statement #___ — I rated it ___ because:
[O] SCIENCE CIRCLE
~15 min | End of week+3 pts
[!] My "Aha!" Moment
[?] My Remaining Question
Discussion Protocol: Share ahas, listen actively,
record class discoveries.