1. Topic: Chemistry Aim: How can we separate mixtures? Do Now: Let’s review yesterday’s ISN. HW: Phases of Matter Reading Notes due Monday Phase changes reading notes due Tuesday

2. 1.An element consists of only one type of atom. 2.He atoms have 2 protons and Na atoms have 11 protons. 3.A compound consists of 2 or more DIFFERENT elements chemically bonded together. 4.A compound can be broken down. 5.A molecule consists of 2 or more atoms of the same element or different elements chemically bonded together. 6.Some molecules are not compounds when they consist of only a single element.

3. H 2 O 2 N 2 H 2 O CO 2 CH 4 Molecules These are not compounds because each is made up of only one element. Compounds These are compounds because each is made up of 2 or more different elements. Are these compounds also molecules?

4. When atoms of the same element join together we get a molecule of that element. Oxygen (O 2 ) Hydrogen (H 2 )

5. Compounds will always exist as molecules, not separate atoms. 3 water (H 2 O) molecules 2 carbon dioxide (CO 2 ) molecules

6. Sieve: separates gravel (small pebbles) from sand Magnet: Separates iron filings from sand Chromatography: separates pigments in a mixture Evaporation: separates solute from a solvent Filtration: separates dirt or sand from water

8. Separates gravel (small pebbles) from sand Sieve

10. Separates iron filings from sand Magnet

11. S eparates pigments in a mixture Chromatography

17. Separates solute from solvent Evaporation

22. Separates dirt or sand from water Filtration

26. Let’s summarize… Explain the type of mixture that can be separated by the following: 1.A sieve 2.Chromatography 3.A magnet 4.Evaporation 5.Filtration

27. Sand and iron particles that are similar in size and color are mixed together in a beaker. What would be the best method of separating the particles? 1.Use tweezers to separate them. 2.Add water to the mixture. 3.Use a magnet to separate them. 4.Pour the mixture into a filter.

28. The substances in a mixture can be separated by physical means because 1.no chemical change occurs when the substances are combined. 2.the physical and chemical properties of the substances change. 3.none of the properties of the substances change. 4.the chemical, but not the physical, properties of the substances change.

29. Identify whether each scenario is a physical change or chemical change and support your answer.

30. Physical change No new substances were produced. It is still glass even though it is broken.

31. Chemical change New substances were produced because of the baking.

32. Chemical change CO2 and ash produced.

33. Physical change No new substances were produced. It is still water even though the ice is melting

34. Physical change No new substances were produced. A substance is just be grinded.

35. Chemical change Iron oxides are produced as a result of the rusting of the nail.

36. Chemical change CO2 is produced and released when the tablet is placed in water.

37. http://www.bbc.co.uk/schools/ks3bitesize/science/ chemical_material_behaviour/compounds_mix tures/revise9.shtml