1. Review of Types of Change

2. Types of Change Reactants: Zn + I 2 Product: Zn I 2

3. Types of Change: At the conclusion of our time together, you should be able to: 1.List the 3 types of change and define each. 2.Classify a change as to nuclear, chemical or physical.

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5. Nuclear Chemical Physical Types of Change Protons & Neutrons change Bonds made/ broken Electrons exchanged No change in atoms a phase change a density change Change can be identified by their atoms.

6. Nuclear Nuclear Change Change in the Gain or lose Protons, Neutrons, Alpha, Beta particle Fission, Fusion, Radiation We looked at these in the last unit Change in the Gain or lose Protons, Neutrons, Alpha, Beta particle Fission, Fusion, Radiation We looked at these in the last unit Proton Neutron nucleus nucleus

7. Physical Physical Change No change in atoms/molecules Phase change (gas, liquid, solid) Light emission/absorption Dissolving Electrons passing through metals

8. Chemical Chemical Change Bonds are made / broken Change in oxidation states Bonds are made / broken Change in oxidation states Cl -1 2121 Li +1

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10. Evidence of Chemical Change: Chemists Get Practice Trying Labs change in color development of a gas formation of precipitate temperature change light Evidence of Chemical Change: Chemists Get Practice Trying Labs change in color development of a gas formation of precipitate temperature change light

11. NOT a Chemical Change: sublimation crystalization fluorescence NOT a Chemical Change: sublimation crystalization fluorescence

12. Chemical Properties are Determined by Observing Chemical Changes Reactivity Combustibility Gas formation Precipitate Color change

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14. Chemical or Physical Ice cubes float in water because: a. The ice is losing mass through the melting process b. The colder ice is more dense c. Liquid water is less dense than ice cubes d. The molecules of ice are arranged in an orderly way so that there is an unusually large amount of empty space in the ice cubes. e. None of the above

15. A hot air balloon rises because: 1. molecules become lighter when heated. 2. molecules move faster and farther apart when heated. 3. molecules are less attracted by gravity when heated. 4. molecules become charged and repel each other when heated. Chemical or Physical

16. The solid, liquid, and gaseous states of water differ from each other in: the mass of the individual atoms. the mass of the individual atoms. the size of the individual atoms. the size of the individual atoms. the net electrical charge of the individual molecules. the net electrical charge of the individual molecules. the average speed of movement of the individual molecules. the average speed of movement of the individual molecules. The solid, liquid, and gaseous states of water differ from each other in: the mass of the individual atoms. the mass of the individual atoms. the size of the individual atoms. the size of the individual atoms. the net electrical charge of the individual molecules. the net electrical charge of the individual molecules. the average speed of movement of the individual molecules. the average speed of movement of the individual molecules. Chemical or Physical

17. If you saw an ice cube sink after it was placed in what you thought was a glass of water, which question should you probably ask? 1. What kind of liquid is in the glass? 2. Will the ice melt slower or quicker? 3. How fast did the ice cube sink? 4. How soon would the ice cube start to float? If you saw an ice cube sink after it was placed in what you thought was a glass of water, which question should you probably ask? 1. What kind of liquid is in the glass? 2. Will the ice melt slower or quicker? 3. How fast did the ice cube sink? 4. How soon would the ice cube start to float? Chemical or Physical

18. Interesting Signs:

19. What will happen if you mix vinegar and baking soda? 1. It will explode. 2. Nothing will happen. 3. It will bubble up rapidly. 4. It will turn bright red. What will happen if you mix vinegar and baking soda? 1. It will explode. 2. Nothing will happen. 3. It will bubble up rapidly. 4. It will turn bright red. Chemical or Physical

20. When a gas forms a liquid, which process is taking place? 1. freezing 2. condensation 3. boiling 4. evaporation Chemical or Physical

21. Based on the melting points shown in the table, which material would still be a solid at 400°C? 1. beeswax 2. gold 3. lead 4. oxygen Based on the melting points shown in the table, which material would still be a solid at 400°C? 1. beeswax 2. gold 3. lead 4. oxygen Substance Melting Point (°C) Beeswax 62 Gold 1,063 Lead 327 Oxygen –218 Substance Melting Point (°C) Beeswax 62 Gold 1,063 Lead 327 Oxygen –218 Chemical or Physical

22. A chemical change for a piece of metal would be 1. being bent in half. 2. getting cut into two pieces. 3. being painted. 4. getting rusty.

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24. Types of Change: Let’s see if you can: 1.List the 3 types of change and define each. 2.Classify a change as to nuclear, chemical or physical.

25. You get up in the morning and make toast for breakfast. You notice the color changes from light to dark. Later on that day in science class, your teachers asks for every day examples of physical and chemical changes. Should you volunteer your toast as an example of a physical or chemical change? Why? Chemical or Physical

26. Lucy noticed that her coin collection had begun to tarnish. Some of the metal in the coins had begun to change color. The formation of tarnish is most similar to which of the following changes? 1. shredding a piece of paper into hundreds of tiny strips 2. dropping a dinner plate on the floor 3. melting ice cubes in a glass of juice 4. burning a piece of paper to ashes in a fireplace Lucy noticed that her coin collection had begun to tarnish. Some of the metal in the coins had begun to change color. The formation of tarnish is most similar to which of the following changes? 1. shredding a piece of paper into hundreds of tiny strips 2. dropping a dinner plate on the floor 3. melting ice cubes in a glass of juice 4. burning a piece of paper to ashes in a fireplace Chemical or Physical

27. Mr. T performed a chemical reaction for the class. Which of these does NOT show evidence that a chemical reaction has occurred ? Change in color Change in shape Formation of gas Formation of a precipitate Mr. T performed a chemical reaction for the class. Which of these does NOT show evidence that a chemical reaction has occurred ? Change in color Change in shape Formation of gas Formation of a precipitate

28. Which picture shows only a physical change in the wood?

29. Which action would result in a chemical change?  crumpling several sheets of paper  pounding a nail into a piece of wood  peeling and slicing a carrot  making blueberry muffins

30. What Kind of a Change is This? Precipitate is the formation of insoluble molecular compounds. What Kind of a Change is This? Precipitate is the formation of insoluble molecular compounds. Does NOT dissolve in water. Chemical

31. A different chemical substance is formed when a: piece of cloth is cut. cup breaks. candle burns. piece of chalk breaks.

32. Which is an example of a chemical change? ice melting salt crystals being ground to powder water evaporating wood burning Which is an example of a chemical change? ice melting salt crystals being ground to powder water evaporating wood burning

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