Chemical Change - C5

Question 1

What does OILRIG stand for

Answer 1

Oxidation is loss

Reduction is gain

Question 2

What groups are very reactive

Answer 2

1,2 and 3

Question 3

Name some metals which are unreactive

Answer 3

Gold, copper, silver and platimun

Question 4

Name some methods of metal extraction

Answer 4

Smelting -carbon
Leaching
Phytomining
Electrolysis

Question 5

How to prepare salts

Answer 5

From acid + metal - use excess metal
From acid + base - use excess base
From acid + alkali - use indicator

Question 6

What is an alkali

Answer 6

A soluble base

Question 7

What is a base

Answer 7

A substance that reacts with an acid and neutralies it

Question 8

What is a salt

Answer 8

It is a compound formed when the hydrogen in acid is replaced by a metal

Question 9

What do acids produce when placed in water

Answer 9

H+ ions

Question 10

what do alkalis produce when placed in water

Answer 10

OH- ions

Question 11

What happens when the pH decreases by 1

Answer 11

the hydrogen ion concentration increases by a factor of 10