The Chinese University of Hong Kong PGDE

1. The Chinese University of Hong Kong PGDE Presentation Package for a Chemistry Lesson ACIDS

2. Author ListGroup 4 Name Duty Chan Pui Sze Photo Scanning & information Collection Lee Suk Ching Sound Effect & Information Collection Sin Wai Ling Graphics & information Collection Yick Ho Kuen Slide Design & Information Collection

3. Part 1 Introduction Part 2 What are the properties of acids? What precautions we have to take in diluting acid? Part 3 Daily examples of acids Part 4 Follow-up questions

4. F.4 chemistry students with average ability at the average age of 15 come across daily products containing acid most are active

5. In this lesson, we use pictures to recall students� memory photos and graphics to show the properties of acid sound effect in the quiz

6. Introduction of acids in daily life Properties of acids Common use of acids Danger of acids A small quiz

8. Most acids have a sour taste. The word �acid� means �sour�.

9. Acids show a pH test colour of orange or red.

10. Acidity can be measured by pH meter. Acids show the pH in the range from 1 to 6.

11. All dilute acids can conduct electricity.

12. Concentrated acids are very corrosive and represented by a symbol as :

14. Dehydration of sugar sugar + acid ? carbon

15. Volatile

16. Fruits(e.g. oranges, lemons and pineapples) contain citric acid Common Household Acids

18. Soft drinks contain carbonic acid.

19. Yoghurt and sour milk contain lactic acid.

20. Domestic cleaners contain methanoic acid.

21. Our stomach secretes hydrochloric acid to help us digest food.

25. Click T or F for the correct answer . For correct answer For incorrect answer 1. Vinegar is a dilution solution of ethanoic acid. T/F 2. Most acids have a bitter taste. T/F 3. Acids can turn litmus paper from red to blue. T/F 4. Acid-alkali neutralizations produce salts. T/F 5. When you dilute a concentrated acid, always add the acid slowly to a large amount of water. T/F

26. Click T or F for the correct answer . For correct answer For incorrect answer 1. Vinegar is a dilution solution of ethanoic acid. T/F 2. Most acids have a bitter taste. T/F 3. Acids can turn litmus paper from red to blue. T/F 4. Acid-alkali neutralizations produce salts. T/F 5. When you dilute a concentrated acid, always add the acid slowly to a large amount of water. T/F