Particle Theory Flashcards
Which state has the least energy?
Solid
Which state has the most energy?
Gas
Are particles the same in solids, liquids and gases?
Yes
Do particles have the same arrangement in solids, liquids and gases?
No
Describe the arrangement of particles in solids, liquids and gases
Solids- particles are held very tightly together
Liquids- particles are close together but can move
Gases- particles are far apart and whiz around a lot
In particle theory, gas pressure is due to
Particles hitting a surface
In particle theory, how do you increase pressure?
Increase temperature
Reduce volume
In particle theory, what is diffusion?
Particles spreading out
In particle theory, explain what happens when you change state from solid to liquid to gas
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What is it called when a gas changes to a liquid.
Condensation
When a gas condenses to a liquid, is heat given out?
Yes
When a liquid freezes, is heat given out or taken in?
Given out
Draw heating and cooling curves
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Why does the heating curve have flat bits at melting and boiling?
At melting or boiling, all the heat energy supplied is used to weaken the forces between particles rather than raising the temperature.
Why does a cooling curve have flat bits at condensing and freezing?
This is because at condensing and freezing, the forces between particles get stronger - and heat is given out.
