Review of Types of Change

1. Review of Types of Change

2. Types of Change Reactants: Zn + I2 Product: Zn I2

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

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

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

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

8. 2 1 Chemical Change Chemical • Bonds are made / broken • Change in oxidation states Li +1 Cl-1 Cl-1

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10. Evidence of Chemical Change: • development of a gas • formation of precipitate • change in color

11. NOT a Chemical Change: sublimation crystalization fluorescence

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

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14. Chemical or Physical • Ice cubes float in water because: • The ice is losing mass through the melting process • The colder ice is more dense • Liquid water is less dense than ice cubes • 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. • None of the above

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

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

17. Chemical or Physical 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? What kind of liquid is in the glass? Will the ice melt slower or quicker? How fast did the ice cube sink? How soon would the ice cube start to float?

18. Interesting Signs:

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

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

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

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

23. Design a Hypothesis

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

25. Chemical or Physical 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?

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? shredding a piece of paper into hundreds of tiny strips dropping a dinner plate on the floor melting ice cubes in a glass of juice 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

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. 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

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