1. Density All students will be able to recall definitions and examples of pure substances, mixtures, solutions and suspensions -C Most student will be able to explain diffusion as the intermingling of liquids and gases caused by the random movement of particles - B Some students will be able to apply their knowledge of diffusion to cellular functions (roots, cell membrane of villi) -A KEY WORDS Pure Element Mixture Solutions Compounds Suspensions Starter Task! Write down the equation for making a solution! Finished? Can you write down the difference between a pure substance and an element?

2. MATTER Pure Substances Mixtures Elements Solutions CompoundsSuspensions

3. elements and compounds Elements – an element is a substance which cannot be broken down into two or more simpler substances by chemical methods. Compounds-A compound is a substance which is made up of two or more different elements combined together.

4. What are Solutions? Solutions are mixtures in which soluble particles are completely dissolved in a liquid or gas.

5. How do we create a Solution? Solute+Solvent=Solution Salt+Water=Salt water solution

6. Common examples and uses SoluteSolventSolution Soap+Water=Soap water solution Everyday use: Washing clothes

7. Common examples and uses SoluteSolventSolution Sugar+Water=Sugar syrup Everyday use: Sweetening tea and coffee

8. Science Example! When you eat food it gets broken down and some releases a sugar called glucose. Glucose is dissolved in our blood like sugar in water and goes to all of the cells in our body to give them energy!

9. What are Suspensions? Suspensions are mixtures in which insoluble particles are suspended in a liquid or gas.

10. How do we create a Suspension? … Insoluble substance +Solvent=Suspension Sand+Water=Sandy water suspension

11. Science Example! Your red and white blood cells cannot dissolve so they move about your blood because they are in suspension because of the water in your blood!

12. Solutions LO Checkpoint! All students will be able to recall definitions and examples of pure substances, mixtures, solutions and suspensions -C Most student will be able to explain diffusion as the intermingling of liquids and gases caused by the random movement of particles -B Some students will be able to apply their knowledge of diffusion to cellular functions (roots, cell membrane of villi) -A

13. Question! What happens when you burn incense in the middle of a living room?

14. Answer! It spreads out until the entire room smells the same! This is called DIFFUSION. Diffusion is when particles move from a high concentration where there are lots to a low concentration where there isn’t as many. They do this until they are evenly spread out! It happens in gases and liquids.

15. TASK It spreads out until the entire room smells the same! This is called DIFFUSION. Write down three examples of gases or liquids that you can think of that diffuse!

16. Solutions LO Checkpoint! All students will be able to recall definitions and examples of pure substances, mixtures, solutions and suspensions -C Most student will be able to explain diffusion as the intermingling of liquids and gases caused by the random movement of particles -B Some students will be able to apply their knowledge of diffusion to cellular functions (roots, cell membrane of villi) -A

17. Diffusion in our bodies Diffusion is how substances enter and leave the cells in our bodies. E.g. oxygen, carbon dioxide, glucose and water. In our small intestines there are villi. Each villus absorbs food molecules and takes them from inside our intestines, into our blood and round our entire bodies by diffusion! Each villus has a good blood supply to take away the molecules or the concentration would build up and diffusion would stop!

18. Diffusion in our bodies TASK Draw the villus opposite and label it. - C Write the name of the process the villus uses to absorb food molecules and how it works. - B Explain why each villus needs a good blood supply. - A

19. Diffusion in Plants Plants also use diffusion to absorb water. When water diffuses it is called OSMOSIS. The water goes from a HIGH concentration in the soil to a LOW concentration in the plant roots. The water is pulled up the inside of the plant in a tube called the XYLEM to the LEAVES. Some water is used up in PHOTOSYNTHESIS and some is lost to the atmosphere. This means the concentration doesn’t get high enough for OSMOSIS to stop.

20. Diffusion in Plants TASK Draw the root hair cell below and label it. - C Write the name of the process the root hair cell uses to absorb water and how it is different to diffusion. - B Explain how water moves inside a plant from the root hair cells to the leaves. - A

21. Solutions LO Checkpoint! All students will be able to recall definitions and examples of pure substances, mixtures, solutions and suspensions -C Most student will be able to explain diffusion as the intermingling of liquids and gases caused by the random movement of particles -B Some students will be able to apply their knowledge of diffusion to cellular functions (roots, cell membrane of villi) -A

22. Density All students will be able to recall the definition of density -C Most students will be able to use the equation for density -B Some students will be able explain density using particle theory and discuss methods of finding density of pure substances -A KEY WORDS Density Mass Volume Particles Starter Task! Write down what the teacher would mean if they said an object like a metal ball was very dense? Finished? Can you write down the units for measuring mass and volume?

23. DENSITY Q) Which weighs more:- A kilogram of feathers or a kilogram of iron? Objective: To describe how to determine density using direct measurements of mass and volume

24. What is Density? Density is the Mass per unit Volume WoodWaterIron 1 cm 3 If you take the same volume of different substances, then they will weigh different amounts. 0.50 g1.00 g8.00 g Q) Which has the greatest mass and therefore the most dense?

25. Density LO Checkpoint! All students will be able to recall the definition of density –C Most students will be able to use the equation for density -B Some students will be able explain density using particle theory and discuss methods of finding density of pure substances -A

26. Density = Mass Volume g or kg cm 3 or m 3 g/cm 3 or kg/m 3  = m V Example: Q) Liquid water has a density of 1.0g/cm 3, while ice has density of 0.92g/cm 3. Calculate the volume occupied by 250g of each. Density Equation: m V  V water = m = 250 = 250cm 3  1.0 V ice = m = 250 = 272cm 3  0.92

27. DENSITY OF A REGULAR SOLID Find the Mass of the solid on a balance. Measure the three lengths and calculate the Volume. (ie V = l x w x h ) Calculate the Density. 4.0 cm 2.0 cm 3.0 cm  = m = 240 =10.0 g/cm 3 V 24 m = 240 g

28. Density LO Checkpoint! All students will be able to recall the definition of density –C Most students will be able to use the equation for density -B Some students will be able explain density using particle theory and discuss methods of finding density of pure substances -A

29. Challenge! Write a paragraph in your note book explaining how you would find the density of a bar of gold (regular cuboid)? Use particle theory to explain why gold is a certain density.

30. Density LO Checkpoint! All students will be able to recall the definition of density –C Most students will be able to use the equation for density -B Some students will be able explain density using particle theory and discuss methods of finding density of pure substances -A

31. Class Booklet Challenge! Complete pages 10-12 in your class booklet to show the teacher what you have learned about density!! THIS SHOULD BE COMPLETED FOR HOMEWORK FOR NEXT LESSON.

32. Density All students will be able to calculate the density of a solid using practical equipment -C Most students will be able to produce a table of results for both regular and irregular objects-B Some students will be able to correctly make a data table, graph and use results to make short conclusion of findings –A KEY WORDS Density Mass Volume Particles Regular Irregular Starter Task! Write down the definition of density and the units it is measured in! Finished? Can you write down the equation for density and even make your own example?

33. DENSITY OF AN IRREGULAR SOLID Find the Mass of the solid on a balance. Find the Volume. Calculate the Density.

34. Archimedes and the Crown Archimedes was a great scientist who lived more than 2000 years ago in a Greek city called Syracuse. He was very clever at inventing and figuring out how things work, so King Hiero needed his help many times.

35. Density of gold 20 g/cm 3 1cm 3 of gold has a mass of 20 g Density of silver 10 g/cm 3 1cm 3 of silver has a mass of 10 g For the same volume, gold has more mass Silver has to have a bigger volume to have an equal mass to gold The mass of the crown was 2000g. It should have a volume of 100cm3 The actual volume of the crown was 150cm3 instead of 100cm3. Was it pure gold ??

36. DENSITY OF AN IRREGULAR SOLID use a Eureka Can to find the Volume. Find the mass of the solid on a balance. Find the mass of the solid on a balance. Add water until just overflowing. Add water until just overflowing. Place a Measuring Cylinder under the spout. Place a Measuring Cylinder under the spout. Add the Object. Add the Object. Collect the Water and read off the Volume. Collect the Water and read off the Volume. Calculate Density Calculate Density m = 440 g 40.0 cm 3  = m = 440 =11.0 g/cm3 V 40

37. MaterialMass in g Length in cm Width in cm Height in cm Volume in cm 3 Density in g/cm 3 Carry out an experiment to measure the density of two regular and two irregular objects. MaterialVolume in cm 3 Density in g/cm 3 Regular objects Irregular objects

38. Class Booklet Challenge! Complete pages 13-14 in your class booklet to show the teacher what you have learned about density!!

39. Quiz

40. Which block X or Y has the greater mass? X 7800 kg 1m 3 5400 kg 2m 3 XY

41. Which block X or Y has the greater volume? Y 7800 kg 1m 3 5400 kg 2m 3 XY

42. Which block X or Y has the greater density? X 7800 kg 1m 3 5400 kg 2m 3 XY

43. Density of Petrol = 800kg/m 3 Density of water = 1000 kg/m 3 Which has more mass 1m 3 of petrol of 1m 3 of water? 1m 3 of water

44. Density of Petrol = 800kg/m 3 Density of water = 1000 kg/m 3 Which has more volume (takes up more space) 1kg of petrol of 1kg of water? 1kg of petrol

45. The density of Aluminium is 2700kg/m 3. what is the mass of 10m 3 of Aluminium? Mass = 2700 x 10 = 27000 kg  = m V Last q