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Unit 9: Matter

Unit 9: Matter. Sub-topic 9.3: What is matter made of? Space between particles. Objective of the lesson. At the end of the lesson, students should be able to: give a reason, why diffusion occurs. recall the state of matter that has less space between particles.

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Unit 9: Matter

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  1. Unit 9: Matter Sub-topic 9.3: What is matter made of? Space between particles.

  2. Objective of the lesson At the end of the lesson, students should be able to: • give a reason, why diffusion occurs. • recall the state of matter that has less space between particles. • recall the state of matter that has a lot of space between particles. • give reason, why diffusion is fastest in gas but slowest in solid. • measure volume using measuring cylinder correctly

  3. Recap previous lesson • What does the word ‘diffusion’ mean? The movement of particles of one substance through the particles of another substance. • In what direction does the particles diffuse? The particles diffuse in all direction.

  4. Recap previous lesson In the practical activity that you and your group have done in the previous lesson showed the different rate /speed of diffusion in solid liquid and gas. • Among these three states of matter, which state diffuse the fastest? Gas. • Among these three states of matter, which state diffuse the slowest? Solid.

  5. Why do particles diffuse?

  6. To answer that question, you will do Practical Activity 9.5: Space between Particles.

  7. Collect your apparatus Each group should collect/have: • 2 measuring cylinder • 1 bottle of ethanol • 1 bottle of distilled water • 1 container of substance A • 1 container of substance B • 1 bottle of salt • 1 plastic spoon • 1 stirring rod ONCE YOUR GROUP FINISH THE PRACTICAL, WRITE DOWN YOUR FINDINGS ON THE TABLE PROVIDED ON THE WHITEBOARD

  8. Make sure that your eyes are on the same level as the lower meniscus of the substance or liquid you are measuring.

  9. You may start now! You have 10 minutes to do your practical activity

  10. Practical Activity 9.5: Space between particles

  11. Practical Activity 9.5: Space between particles

  12. Why do particles diffuse? • Particles diffuse because there is space between the particles. • Also the particles must be moving. • Look at the diagrams of the particles in a gas, a liquid and a solid.

  13. Particles in a gas • There is alot of space between gas particles.

  14. Particles in a liquid • There is spacebetween liquid particles, but the space is lessthan in gas

  15. Particles in a solid • There is only a smallspacebetween the particles in solids.

  16. Diffusion in gases is faster than diffusion in liquids because the space between gas particles is more than the space in liquid particles. • Diffusion in solids is slowerthan diffusion in liquids because the space in solid particles is lessthan space in liquid particles • Therefore, diffusion happened the fastest in gas and slowest in solid because there is a lot of space in gas but lessspace is available in solid.

  17. SUMMARY PUT AWAY YOUR NOTES FIRST

  18. SUMMARY • Why do particles diffuse? • In which state of matter (solid, liquid or gas) will you find a lot of space between particles? • In which state of matter (solid, liquid or gas) will you find a small of space between particles? • Why do gas particles diffuse faster than solid particles?

  19. THE END THANK YOU 

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