Particle Theory
This theory states that particles are always in motion.
The Particle Theory of Matter
Water freezes at this temperature on the Celsius scale.
What is 0°C?
The boiling point of water on the Celsius scale.
What is 100°C?
Ice floats because it is less this than liquid water.
What is dense?
Builders must leave small gaps in sidewalks, bridges, and other structures because the materials will do this when temperatures change.
What is expand and contract? (due to heating and cooling)
When matter is heated, its particles do this.
What is speed up and move farther apart?
In this phase change, a solid becomes a liquid.
What is melting?
A thermometer works because liquids do this when heated and cooled.
What is expand when heated and contract when cooled?
Lakes don’t freeze solid because this layer stays on top of the water.
What is the ice layer?
All matter is made of tiny particles that do this constantly
What is move?
When matter cools, particles do this.
What is slow down and move closer together?
A liquid turning into a gas is known as this.
What is evaporation or boiling?
The liquid in a thermometer rises when this happens to the temperature.
What is it increases?
Ice floats on lakes in winter because it is this compared to liquid water.
What is less dense?
During a phase change, the volume of the substance does this.
During a phase change, the mass of the substance does this.
What is stay the same?
This phase change describes a gas becoming a liquid.
What is condensation?
A thermometer works because the liquid inside it does this when the temperature goes down
What is contract (move down the tube)?
Water freezes from the top down because ice is less dense than liquid water. Why is this important for lakes in winter?
What is because it protects the aquatic life? (The ice layer insulates the water below.)
A substance changing state from gas to solid without becoming liquid is called this.
What is deposition?
Can you please describe the particles in each of the following states: solid, liquid, and gas
Solid - close together and vibrating
Liquid - Flowing, spaced out and sliding around
Gas - Zoomies! Lots of space between and moving quickly
This rare phase change skips the liquid phase and goes directly from solid to gas.
What is sublimation?
What do the following stand for:
K
°C
°F
This term refers to how tightly packed the particles of a substance are.
What is density