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States of Matter Investigation

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States of Matter Investigation

Use the particle model and the evidence in each case file to classify materials and explain how particle motion and spacing account for their properties. Assume samples are pure substances unless stated otherwise.

Case File 1: The Particle Model

A lab team records these observations: Sample A keeps its shape and volume. Sample B takes the shape of its container but has a nearly fixed volume. Sample C spreads to fill its container and can be compressed significantly.

1.Classify Samples A, B, and C as solid, liquid, or gas. For each, cite one observation that supports your classification.

2.Which particle description best explains why Sample C is much more compressible than Sample A?

Gas particles have large spaces between them that can be reduced; solid particles are already closely packed.
Gas particles are smaller atoms than solid particles.
Solid particles have no motion, while gas particles move only when compressed.
Gas particles have less mass, so they collapse when pressure is applied.

3.A sealed syringe contains air. The nozzle is closed, and the plunger is pushed inward. Describe what happens to the gas volume and explain the change using particle spacing and collisions with the syringe walls.

Case File 2: Heating and Cooling

A sealed sample of pure water is warmed from ice below 0°C to liquid water and then steam above 100°C at standard atmospheric pressure. The amount of water remains constant.

4.During melting, what happens to the average kinetic energy of the water particles while the temperature remains at the melting point?

It stays approximately constant as energy is used to overcome attractions between particles.
It increases steadily because any added energy raises temperature.
It falls to zero while the water changes state.
It becomes unrelated to particle motion.

5.Explain the difference between evaporation and boiling. Include where each process occurs and whether it can happen below the boiling point.

6.A cold glass develops water droplets on its outside. A student claims the liquid water leaked through the glass. Give a particle-level explanation for the droplets and name the state change.

Case File 3: Explain the Evidence

The lab team compares two claims against observable evidence. Use scientific reasoning, not just a label.

7.A student says, “Air cannot be matter because I cannot see it.” Evaluate the claim using the definition of matter and one measurable property of air.

8.A sealed, flexible bag is placed in a warm room. Predict how the gas particles’ average kinetic energy and the bag’s volume may change, assuming the bag can expand and external pressure stays nearly constant. Explain your prediction.

9.A wax sample is solid at room temperature but softens and flows when warmed. Is “solid” still a reasonable classification at room temperature? Support your answer with two properties, and explain why the warmed wax behaves differently.

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States of Matter Investigation

States of Matter Investigation

Case File 1: The Particle Model

Case File 2: Heating and Cooling

Case File 3: Explain the Evidence

3 printable pages

About This Worksheet

Free in Kuraplan

Print-Ready

AI-Generated

For Teachers & Parents

Need a custom version of this worksheet?

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