Some things

Question 1

S.V.D.S.F

Answer 1

it is how to work out valencies
symbols
valency
divide
simplify
formula

Question 2

Acid + metal ———->………

Answer 2

A salt+ hydrogen

Question 3

Acid+ base ———->………..

Answer 3

A salt+ water

Question 4

Acid+ carbonate——–>……..

Answer 4

A salt+ carbon dioxide+water

Question 5

What does all acids contain?

Answer 5

hydrogen

Question 6

How can metals that are less reactive than carbon can be extracted from there ore?

Answer 6

Reduction with carbon

Question 7

what are the reactions when fuels are burnt?

Answer 7

combustion and exothermic

Question 8

Name some greenhouse gases?

Answer 8

carbon dioxide, methane, Nitrous oxide

Question 9

How is quicklime made from limestone?

Answer 9

If limestone is heated it breaks down into calcium oxide and carbon dioxide. Calcium oxide is quicklime it is yellow when hot white when cold.

Question 10

How does combustion of fuels lead to acidic rain?

Answer 10

Because it produces sulphur dioxide, carbon dioxide, nitrogen oxides in the atmosphere. As the rain falls it absorbs the gases and produces acidic rain

Question 11

Global warming?

Answer 11

burning fossil fuels increases the level of CO2 in the atmosphere causing global warming