C5: Chemical Changes

Question 1

What reacts to produce metal oxides?

Answer 1

Metals and oxygen

Question 2

What type of reaction is the reaction that produces metal oxides?

Answer 2

Oxidation

Question 3

What ions are formed when metals react with other substances?

Answer 3

Positive ions

Question 4

What are the first 8 elements in the reactivity series?

Answer 4

K, Na, Li, Ca, Mg, Zn, Fe and Cu

Question 5

How can metals less reactive than carbon be extracted?

Answer 5

Reduction with carbon

Question 6

What reacts to produce salt and hydrogen?

Answer 6

Metals and acids

Question 7

What reacts to produces salt and water?

Answer 7

Acids and alkalines/bases (metal oxides and metal hydroxides)

Question 8

What reacts to produce salt, water and carbon dioxide?

Answer 8

Metal carbonates and acids

Question 9

How are soluble salts made?

Answer 9

Reacting an acids with a solid insoluble substance, e.g. metals, metal oxides, etc.

Question 10

What are 3 examples of strong acids?

Answer 10

Hydrochloric, sulfuric and nitric

Question 11

What are 3 examples of weak acids?

Answer 11

Ethanoic, citric and carbonic

Question 12

What is produced when an acid reacts with a base?

Answer 12

A salt and water

Question 13

What are the formulae for sulfuric acid and nitric acid?

Answer 13

H2S04 and HNO3

Question 14

What is the formula for calcium carbonate?

Answer 14

CaCO3

Question 15

Give 2 reasons why using a pH probe is better than using universal indicator

Answer 15

It produces more accurate results, and determining the colour in universal indicator is subjective

Question 16

In what direction does the position of equilibrium lie in a weak acid?

Answer 16

To the left (reactants)

Question 17

Why do we find pure gold in the ground, but not iron?

Answer 17

Iron is reactive enough to react with oxygen, but gold is unreactive