A comprehensive multi-day physical science sequence exploring the core foundations of matter, physical versus chemical properties, and particle-level states of matter. Students investigate real-world substances through scaffolded slides, hands-on classification sorting, particle modeling labs, and targeted assessments.
Golden Rule: A chemical property describes how a substance can react to make BRAND NEW SUBSTANCES.
1. Flammability (Can it burn?)
Catches fire with oxygen to make smoke and ash.
2. Reactivity with Acid
Bubbles, fizzes, or releases gas when mixed with acid.
3. Rusting / Oxidizing
Reacts slowly with oxygen to form reddish rust.
4. Non-Reactive (Inert)
Resists reacting; stays unchanged (like gold or helium).
Part 5: Clue Word Comparison Matrix
Key Question:
Physical Property (Same Stuff)
Chemical Property (New Stuff)
Test Question:
Did the substance stay chemically the same?
Did a brand-new substance form?
Clue Words:
color, melting point, density, shape, boiling
flammable, burns, rusts, reacts with, rots
Part 6: Detective Practice with Sentence Stems
Circle [P] for Physical or [C] for Chemical, then complete the sentence stem.
1. Diamond is extremely hard and can scratch glass. [ ] P [ ] C
Stem: This is physical because scratching glass does NOT create a new...
2. Copper sheets turn green over time in moist outdoor air. [ ] P [ ] C
Stem: This is chemical because the copper reacts with air to form a new...
3. Liquid alcohol evaporates quickly into gas on warm skin. [ ] P [ ] C
Stem: This is physical because changing from liquid to gas is just a change in...
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Stem: Melting wax is physical because it only changes from a solid to a liquid, staying as...
B. Burning Wax: Physical or Chemical? Use the sentence stem:
Stem: Burning wax is chemical because it reacts with oxygen to form new substances like...
Case 2: Airplane Materials
Engineers build airplanes with aluminum instead of heavy iron rebar.
Physical Reason:
Stem: Aluminum has lower... (mass / density).
Chemical Reason:
Stem: Aluminum does not easily... (rust / burn).
Part 3: Scientific Argument (Claim • Evidence • Reasoning)
Prompt: A student claims: "Dissolving salt in water is a chemical property because the salt crystals disappear." Correct this claim below:
Claim: Dissolving salt is actually a ____________ property.
Evidence & Reasoning: Complete the sentence:
Stem: If the water evaporates away, the salt crystals will ______________, which proves no new substance was made.
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Matter
NOT Matter
Matter
NOT Matter
Part 3 Boiling Water Quick Check: Steam is still H₂O molecules; only the particle spacing and speed changed, not the chemical bonds or composition.
Part 6 Detective Scenarios: 1. Diamond hardness = [P] (resistance to deformation without chemical change); 2. Copper patina = [C] (reacts with atmospheric CO₂/moisture to form copper carbonate); 3. Alcohol evaporation = [P] (phase transition liquid to gas).
Property Sorting Challenge Activity Key
Cards 1–8: Card 1 = P (melting pt/luster) | Card 2 = C (reactive with water) | Card 3 = C (flammable/combustion) | Card 4 = P (ductility/conductivity) | Card 5 = C (oxidation/rusting) | Card 6 = P (density/hardness) | Card 7 = C (reacts with acid to form gas) | Card 8 = P (solubility).
Case 1 (Candle Paradox): A. Melting wax = Physical (solid wax to liquid wax, formula unchanged). B. Burning wax vapor = Chemical (hydrocarbons react with O₂ to form CO₂, H₂O, soot).
Case 2 (Aerospace): Physical: Low density (lightweight) or high melting point. Chemical: High resistance to oxidation/corrosion (unlike iron which rusts rapidly).
Part 3 CER: Claim: Dissolving salt is a physical property. Evidence/Reasoning: If the solution is boiled or allowed to evaporate, the original white salt crystals remain with identical physical and chemical traits. No new chemical bonds were forged.
Exit Ticket Key & Scoring Rubric
Q1 (Matter Filter): Correct: A (Helium gas) and C (Liquid mercury). Incorrect: B (Flashlight beam) and D (Radio waves) are electromagnetic energy.
Q2 (Multiple Choice):C (Magnesium reacts with acid to release hydrogen gas). A, B, and D are physical.
Q4 (Apple Scenario): A. Slice A (cutting) = Physical; Slice B (browning) = Chemical. B. Cutting changes shape/size but leaves apple cells chemically identical. Browning is enzymatic oxidation, forming new melanin-like compounds that cannot be mechanically reversed.
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• Condensation: Gas → Liquid (Dew on grass)
• Deposition: Gas → Solid directly (Frost on window)
Particles slow down and lock together!
Phase changes are strictly PHYSICAL CHANGES—H₂O stays H₂O in all three forms!
The Heating Curve Mystery
Plateau Effect
What happens during a Phase Change?
When ice is melting or water is boiling, thermal energy is continuously added...
YET THE TEMPERATURE DOES NOT RISE!
The temperature stays locked at 0°C until all ice is liquid, and at 100°C until all water is steam.
Where Does the Energy Go?
During a phase change, heat energy is NOT increasing particle speed (kinetic energy).
It is used to overcome attractive forces holding particles together!
Slanted lines on a heating curve = Temperature rises. Flat plateaus = State change in progress!
Identify the Phase Transition
Class Check
Scenario 1: Cold Soda Can
Water droplets form on the outside of a chilled soda can on a hot summer day.
Which phase change is this?
Scenario 2: Disappearing Dry Ice
A block of solid CO₂ shrinks over time without ever leaving any liquid puddle.
Which phase change is this?
Scenario 3: Winter Windshield Frost
Water vapor in freezing air turns directly into ice crystals on a car windshield.
Which phase change is this?
Scenario 4: Steaming Sidewalk
A puddle of rainwater dries up completely when the bright sun warms the asphalt.
Which phase change is this?
Turn & Talk: Is thermal energy being absorbed or released in each scenario?
Part 5 Heating Curve: 1. Temperature remains constant / plateaus. 2. Thermal energy overcomes intermolecular attractions rather than speeding up particles.
Part 6 Steam Burns: Steam carries latent heat of vaporization. When steam hits cooler skin (37°C), it condenses back into liquid water, releasing an enormous surge of thermal energy (2,260 J/g) directly onto tissue.
Phase Change Investigator Activity Key
Station 1: A. Vaporization/Boiling (liquid to gas). B. Condensation (gas to liquid). C. Heat transfers from warm gas to cold mirror; particles lose kinetic energy, slow down, and attractive forces pull them back into liquid droplets.
Station 2: Ice = Melting (Solid to Liquid). Dry Ice = Sublimation (Solid to Gas). Mass didn't disappear; it sublimated into invisible CO₂ gas dispersing into room air.
Station 3: Submerging in ice water drops the temperature inside the bottle. Gas particles slow down and hit inner walls with far less force/frequency, causing internal pressure to drop. Greater external atmospheric pressure crushes the bottle.
Station 4 (Substance Z): A. Melting Pt = 45°C (min 2–6 plateau). B. Boiling Pt = 120°C (min 12–14 plateau). C. Both Solid and Liquid coexist between min 2 and 6.
Synthesis CER: Claim: No, adding heat does not always increase temperature. Evidence: During minutes 2–6 (45°C) and 12–14 (120°C), 500 J/min was added yet temperature remained flat. Reasoning: Heat at plateaus is used as potential energy to break intermolecular attractions during phase transitions.
States Mastery Exit Ticket Key
Q1: 1. Solid | 2. Liquid | 3. Gas.
Q2 (Multiple Choice):B (Thermal energy is removed; particles slow down and attractive forces pull them closer).
Q4 (Boiling Constant Temp): Temperature measures average kinetic energy (particle speed). During boiling, added thermal energy is consumed as latent heat to overcome attractive intermolecular bonds holding water molecules together, releasing them into gas, rather than accelerating particles.
