Instructions for Objective 5.7 and 5.8
1. 5.7 and 5.8 Starter. Find out the names of the processes. Research on the internet if necessary. No need to blog this.
2. 5.7 and 5.8. Forward this e-mail to your blog and type the answers into the e-mail.
3. 5.7 and 5.8 Experiment. I’m afraid you can’t do the expt until we get back but watch the video clip to see how it’s set up and have a look at the graph of the results.
4. 5.7 to 5.10 Plenary 1. Play the attached “States of Matter”
5. 5.7 to 5.10 Plenary 2. Play the attached “Fill the trucks”
6. PhET States of matter simulation - embedding into your Posterous blog. Embed in your blog and then have a play
What are the 6 processes shown by the arrows?
Solid à Liquid: Melting
Liquid à Gas: Boiling
Gas à Liquid: Condensing
Liquid à Solid: Freezing
Solid à Gas: Desublimation/ Deposition
Gas à Solid: Sublimation
· 5.7 understand that a substance can change state from solid to liquid by the process of melting
· 5.8 understand that a substance can change state from liquid to gas by the process of evaporation or boiling
Q1. a)
· Particles in a solid have strong bonds and therefore they only vibrate and are held together in a fixed pattern
· The bonds in liquids and gases are weaker than the solid and therefore they can move and change their shape
b)
· The particles of solids and liquids are close to each other and cannot be compressed
· The particles in gases are compressible as there are weak forces between them
Q3.
Boiling:
· Boiling happens when a liquid is heated to a certain temperature (it’s boiling point)
· It increases the energy of the particles until it is high enough for them to move around freely
· Boiling happens throughout the liquid
· It is faster than Evaporation
Evaporation:
· Evaporation happens when a liquid is left open
· Only the particles at the surface of the liquid can escape as they are the particles that have enough energy
· Evaporation doesn’t happen at a particular temperature
· High temperatures increase evaporation, low temperatures decrease evaporation
- Because it removes the most energetic particles from a liquid the average energy of the remaining particles is decreased and the liquid cools down
- It is slower than boiling
5.7 and 5.8 Experiment - Cooling Curve of Stearic Acid using datalogger
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5.7 to 5.10 Plenary 1
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| · Play the Stage 1 game to test your knowledge of solids, liquids and gases · Play the Stage 2 game to test your knowledge about changes of phase! | ||
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5.7 to 5.10 Plenary 2
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