Solids, liquids, and gases

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linh.tranLittle Lab Notes

🎯 Try it

Solid: twelve closely packed regular dots. Liquid: twelve closely packed irregular dots. Gas: twelve widely spaced dots. All dots have equal size.

Single choice

Why can a gas be compressed easily?

Compare ice, water, and water vapour without heating anything. Do particles themselves grow?

⏱️ Practice timer

05:00

🔎 Worked example

These are simplified snapshots, not photographs. Solid particles vibrate; liquid and gas particles move. Do not infer that dots on a still page are motionless.

In a solid, particles stay near fixed positions and vibrate. In a liquid, particles remain close but can move past one another. In a gas, particles are widely separated and move freely between collisions. Heating transfers energy; particles do not swell into larger particles. During melting, the arrangement changes. The substance remains water when ice melts; this is a physical change.

✏️ Practice

1.

Match solid, liquid, or gas: fixed shape; flows with nearly fixed volume; fills the container.

2.

Redraw the gas in a smaller container without changing dot size or number.

3.

Correct “Ice melts because water particles grow.”

4.

Explain why a liquid flows but is hard to compress.

💭 Your answer

Single choice

What changes when ice melts?

My explanation of liquid flow and compression using particle spacing and motion

✅ Quick check

Single choice

Which drawing best models a liquid?

🔑 Answers

🔑 Practice answers

1.

Fixed shape: solid. Flows with nearly fixed volume: liquid. Fills the container: gas.

2.

Keep twelve equal dots and reduce the spacing; none disappear or shrink.

3.

Energy transfer changes particle motion and arrangement. The particles do not grow, and the substance remains water.

4.

Closely packed particles can move past each other, but little empty space is available to reduce.

💡 Hint and challenge

💡 Hint: Use the same number and size of counters for all three states.

⭐ Challenge: Explain why diffusion is generally faster in gases than liquids using spacing and movement.

🔎 Challenge answer

Gas particles can travel between more widely separated neighbors; movement and mixing are less constrained than in a liquid. Diffusion is generally faster in gases under comparable conditions.