1. Chemical Reactions Sripaka Chareonyot Pranee Saelim Pichet Yooyong White Peacock

2. Changing Definition Demonstration Examination EXIT

3. Changing Physical ChangeChemical Change Changing Definition Demonstration Examination EXIT

4. Does not produce a new substance. Can be easily reversed. Changes in physical properties Changing Definition Demonstration Examination EXIT

5. Changing Definition Demonstration Examination

6. produce a new substance. difficult to regenerate the original substances Rearranged to form one or more substances on molecule level Changing Definition Demonstration Examination EXIT

7. Changing Definition Demonstration Examination EXIT

8. Color Change Precipitate Formation Changing Definition Demonstration Examination EXIT

9. Gas Formation Odor Changing Definition Demonstration Examination EXIT

10. Temperature Change Change in Acidity Changing Definition Demonstration Examination EXIT

11. Demonstration of experimental chemistry.

12. Mg (s) + 2HCl (aq) MgCl 2 (aq) + H 2 (g) ReactantsProducts

13. When Strips of Mg are added to HCl, the Mg fizzes strongly because the acid reacts with it. This fizzing is made by bubbles of gas forming on the metal. Changing Definition Demonstration Examination EXIT

14. A chemical reaction is a chemical change which forms new substances. Changing Definition Demonstration Examination EXIT

15. Can you write a mindmaping about chemical reactions?

16. Classify the following changes as Chemical or Physical Changes ChangeAnswer 1. You cut your hair 2. Mixing sugar and water 3. Baking soda reacts with vinegar and forms a gas 4. Methanol is burned and leaves a residue 5. Copper turns green when exposed to the environment 6. Two clear liquids are mixed and a yellow color forms 7. Diamonds are used to scratch glass 8. A tree burns to form ashes 9. Water freezes to form ice 10. Water evaporates into steam Physi cal Chemi cal Physi cal Chemi cal Physi cal Chemi cal

17. Explanation Choose the correct item. 1. A substance that enters into a chemical reaction is called a …… a. mole. b. product. c. coefficient. d. reactant.

18. Explanation Choose the correct item 2. In a reaction in which hydrogen reacts with oxygen to produce water, which substances are the reactants? a. hydrogen only b. oxygen only c. both hydrogen and oxygen d. water

19. Explanation Choose the correct item 3. Which of the following is not an example of a chemical change? a. rusting iron b. an apple ripening c. cutting paper d. a piece of wood burning

20. Explanation Choose the correct item 4. In a chemical equation, the symbol that takes the place of the words reacts with is a(n) a. equal sign. b. coefficient. c. plus sign. d. arrow.

21. Explanation Choose the correct item 5. Mg + 2HCl MgCl 2 + H 2 Which are the produces in this reaction? a. Mg b. Mg + 2HCl c. MgCl 2 + H 2 d. Mg and MgCl 2