1. Acids and Bases

2. What is an Acid?
Tends to taste sour or sweet. (Most of the food we eat is acidic)

3. What is an Acid? Tends to taste sour or sweet.
Reacts with metals, producing a gas

4. What is an Acid? Tends to taste sour or sweet.
Reacts with metals, producing a gas
Has a pH lower than 7 on the pH scale.
basic

5. What is an Acid? Tends to taste sour or sweet.
Reacts with metals, producing a gas
Has a pH lower than 7 on the pH scale.
Turns litmus paper red.

6. What is an Acid? Tends to taste sour or sweet.
Reacts with metals, producing a gas
Has a pH lower than 7 on the pH scale.
Turns litmus paper red.
Red litmus paper stays red.
Blue litmus paper turns red.

7. What is a base?
Tends to taste bitter.

8. What is a base? Tends to taste bitter.
Does not react with metals (no bubbles of gas)

9. What is a base? Tends to taste bitter.
Does not react with metals (no bubbles of gas)
Can be slippery to touch

10. What is a base? Tends to taste bitter.
Does not react with metals (no bubbles of gas)
Can be slippery to touch
Has a pH greater than 7 on the pH scale
basic

11. What is a base? Tends to taste bitter.
Does not react with metals (no bubbles of gas)
Can be slippery to touch
Has a pH greater than 7 on the pH scale
Turns litmus paper blue

12. What is a base? Tends to taste bitter.
Does not react with metals (no bubbles of gas)
Can be slippery to touch
Has a pH greater than 7 on the pH scale
Turns litmus paper blue
Blue litmus paper stays blue
Red litmus paper turns blue

13. What is a Neutral substance?
It has a pH of exactly 7.
basic

14. What is a neutral substance?
It has a pH of exactly 7
Litmus paper does not change colour

15. What is a neutral substance?
It has a pH of exactly 7
Litmus paper does not change colour
Blue litmus paper stays blue
Red litmus paper turns blue

16. pH bowtie

17. pH bowtie 1 2 3 4 5 6 8 9 7

21. Stays red

22. Stays red Turns blue

23. Stays red Turns blue Stays red

24. Stays red Turns blue Stays red
Turns red

25. Stays red Turns blue Stays red
Turns red Stays blue

26. Stays red Turns blue Stays red
Turns red Stays blue Stays blue

27. Homework
Workbook pages 37-38

28. Which bottle is safe to drink?

29. 78C C C

30. 78C C C

31. 78C C C
No reaction No reaction Bubbles

32. Characteristic Properties
A characteristic property is a specific aspect of a substance that helps us identify it.

33. Homework
Workbook pages 37-38

34. Density