Chemical Changes

Question 1

What is it called when a metal for example gains oxygen ?

Answer 1

Oxidation

Question 2

What does the reactivity of a metal depend on ?

Answer 2

It’s tendency to form a positive ion for example lose an electron

Question 3

What is the most reactive metal ?

Answer 3

Potassium

Question 4

What is the least reactive metal ?

Answer 4

Gold

Question 5

What does reduction involve ?

Answer 5

Loss of oxygen

Question 6

What do acids react with metals to make ?

Answer 6

Salts and or hydrogen

Question 7

What are acids neutralised by ?

Answer 7

Alkalis and bases

Question 8

What do alkalis and Bases produce ?

Answer 8

Salts and water

Question 9

What do metal carbonates produce ?

Answer 9

Salts, water and carbon dioxide

Question 10

How can soluble salts be made ?

Answer 10

Acids reacting with insoluble substances

Question 11

What can PH be measured with ?

Answer 11

Universal indicator

Question 12

What are examples of strong acids ?

Answer 12

Hydrochloric acid, nitric acid, and sulphuric acid

Question 13

What are examples of weak acids ?

Answer 13

Ethanoic, citric and carbonic acids

Question 14

When an ionic compound is melted or dissolved in water it is able to … ?

Answer 14

Conduct electricity

Question 15

What happens to the ions when there is an electric current through the electrolytes ?

Answer 15

Ions move to electrodes

Question 16

Where do positively charged ions move ?

Answer 16

To the negative electrode { cathode }

Question 17

Where do negatively charged ions move ?

Answer 17

To the positive electrode { anode }

Question 18

When lead bromide is electrolysed what is formed at the cathode ?

Answer 18

Lead

Question 19

When lead bromide is electrolysed what is formed at the anode ?

Answer 19

Bromine

Question 20

What is produced at the cathode if the metal is more reactive than hydrogen ?

Answer 20

Hydrogen

Question 21

What is produced at the anode ?

Answer 21

Oxygen