Unit 9 Matter Subtopic 9 3 What is

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. �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

Recap previous lesson 1. What does the word ‘diffusion’ mean? The movement of particles of one substance through the particles of another substance. 2. In what direction does the particles diffuse? The particles diffuse in all direction.

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. 3. Among these three states of matter, which state diffuse the fastest? Gas. 4. Among these three states of matter, which state diffuse the slowest? Solid.

Why do particles diffuse?

To answer that question, you will do Practical Activity 9. 5: Space between Particles.

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

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

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

Practical Activity 9. 5: Space between particles

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.

Particles in a gas �There is a lot of space between gas particles.

Particles in a liquid �There is space between liquid particles, but the space is less than in gas

Particles in a solid �There is only a small space between the particles in solids.

�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 slower than diffusion in liquids because the space in solid particles is less than 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 less space is available in solid.

SUMMARY PUT AWAY YOUR NOTES FIRST

SUMMARY 1. Why do particles diffuse? 2. In which state of matter (solid, liquid or gas) will you find a lot of space between particles? 3. In which state of matter (solid, liquid or gas) will you find a small of space between particles? 4. Why do gas particles diffuse faster than solid particles?

THE END THANK YOU