Topic 3: Acids and Bases

Question 1

What is does a universal indicator do?

Answer 1

A chemical used to determine the pH of a substance

Question 2

State the expected colour change and pH range if universal indicator is added to the following substances: acids, alkali, neutral

Answer 2

Acid- red/orange, 0-6
Alkali- blue/purple, 8-14
Neutral- green, 7

Question 3

Determine the solubility of these different compounds: potassium hydroxide, calcium carbonate, lead (II) nitrate, copper (II) oxide
*have to use the data booklet for this question!

Answer 3

1. very soluble 2. insoluble
2. very soluble 4. insoluble

Question 4

State the effect that these different oxides have on the pH of the water once they are added: non-metal oxide, soluble metal oxide, insoluble metal oxide

Answer 4

1. decreases, turns acidic
2. increases, turns alkali
3. increases, turns alkali

Question 5

Give an example of how wcid can negatively impact your health

Answer 5

Drinking too much fizzy drinks can cause acid tooth decay

Question 6

What is the name given when a reaction of an acid with a base, results in the pH moving towards 7

Answer 6

Neutralisation

Question 7

Name the three types of bases:

Answer 7

Metal oxide
Metal hydroxide
Metal carbonate

Question 8

State the general equation of an acid reacting with a base

Answer 8

Acid + base > salt + water

Question 9

cannot put question 9 of unit 3 acids and bases in here. look up/study lesson 5 pg 13 naming salts

Answer 9

DO IT NOW