Diffusion What is diffusion Starter Round the room

Diffusion What is diffusion? Starter: Round the room Qs. What is diffusion?

Competition time Will you get an easy or a hard one? 10 seconds to answer: 1 2 3 Name 5 specialised What is the job of a What do we use to cells. sperm cell? look at cells? 4 5 6 Name a feature of a nerve cell that root hair cell that What is the job of helps it do its job. the root hair cell? 7 If I have 2 lenses of x 40 and x 50, what is the overall magnification? 8 Name 2 specialised plant cells 9 Where is Mrs C going on holiday this year ? What is diffusion?

Batting order. Lesson timeline: 1) Complete starter. 2) Observing diffusion. 3) discussion on diffusion. 4) watching demos on diffusion • check point – be able to explain that diffusion is from high to low concentration Success Criteria • To define the term ‘diffusion’. • To be able to explain that diffusion is faster if there is a bigger concentration difference. • Give examples of substances that diffuse into and out of cells. What is diffusion?

Call my Bluff • Semi Permeable Membrane What is diffusion?

Call my Bluff • Semi Permeable Membrane – a membrane, for example around a cell, that will let small enough substances through. • Semi permeable membrane – A membrane where half of the material is missing. • Semi permeable membrane – a layer which completely blocks all molecules from moving What is diffusion? through it.

Today’s question… Why can’t you smell a fart straight away? What is diffusion?

Think Pair Share. When will diffusion stop? Semi permeable membrane What is diffusion?

Lets investigate – 1) Potassium Permanganate. 1 or 2 crystals dropped into a large beaker of water. Observe what happens to the colour of the water. 2) The spreading of ammonia gas and hydrogen chloride gas. USE A FUME CUPBOARD. What is diffusion?

Diffusion Challenge: • On your white boards write a definition of diffusion. • This is the net movement of particles from a high concentration to a low concentration. Success Criteria To define the term ‘diffusion’. What is diffusion?

Think Pair Share In which situation will diffusion happen quickest? Explain why in your books What is diffusion?

What is the net movement? • Competition time • Work out the net movement in these challenges. • You can only have 1 challenge at a time. Take it back to your table and work it out. • Write your answer down. • Show me • I will give you the next. • First to finish = ? ? points What is diffusion?

1) 30 water molecules move into a cell and 68 move out. What is the net movement and in which direction is it? 2) 196 amino acids move out of a cell and 456 move in. what is the net movement and in which direction? 3) 1857 salt molecules dissolved in blood, move into a cell which has equal salt and water. With this, 2067 water molecules move. Only 34 salt molecules leave the cell and 1097 water molecules leave the cell. What is the net movement of water and salt. Will the cell have more salt or water. ? What is diffusion?

Check point • If 30 water molecules move into a cell, and 25 move out, what is the net movement into the cell? 1) 5 2) 25 3) 55 What is diffusion?

What is a Concentration Gradient? • Hills and graphs have gradients • Think pair share. Which is the steepest gradient ? Which could you move down quickest? What is diffusion?

moving down a concentration gradient Which way will the particles move? What is diffusion?

Modelling diffusion • Drain pipes and marbles. • How good is this model? What is diffusion?

How does diffusion work in the body Identify which molecules in your body need to move around AND are small enough to move through cell membranes. Use the information to help you. CARD SORT What is diffusion?

Conclusion Qs CHALLENGE Can do Draw a diagram to show diffusion. show what Give examples of happens during things that diffuse diffusion. in the body and Describe the model explain why they we used and how it diffuse. was like real life. 5 points 3 points C/B D/C IRON MAN Think of a model of diffusion that could be used to explain to students about to learn about diffusion. Write notes about it so that a teacher could use it in their lesson. 8 points B/A What is diffusion?

Plenary • Round the room 1 more time. What is diffusion?