Acids and Bases
What is an Acid? Tends to taste sour or sweet. (Most of the food we eat is acidic)
What is an Acid? Tends to taste sour or sweet. Reacts with metals, producing a gas
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
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.
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.
What is a base? Tends to taste bitter.
What is a base? Tends to taste bitter. Does not react with metals (no bubbles of gas)
What is a base? Tends to taste bitter. Does not react with metals (no bubbles of gas) Can be slippery to touch
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
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
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
What is a Neutral substance? It has a pH of exactly 7. basic
What is a neutral substance? It has a pH of exactly 7 Litmus paper does not change colour
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
pH bowtie
pH bowtie 1 2 3 4 5 6 8 9 7
Stays red
Stays red Turns blue
Stays red Turns blue Stays red
Stays red Turns blue Stays red Turns red
Stays red Turns blue Stays red Turns red Stays blue
Stays red Turns blue Stays red Turns red Stays blue Stays blue
Homework Workbook pages 37-38
Which bottle is safe to drink? 1 2 3
78C 100C 110C
78C 100C 110C 7 7 3
78C 100C 110C 7 7 3 No reaction No reaction Bubbles
Characteristic Properties A characteristic property is a specific aspect of a substance that helps us identify it.
Homework Workbook pages 37-38
Density