4.1

Question 1

All acids contain which element in formulae

Answer 1

Hydrogen

Question 2

When dissolved in water, acids always release which ion

Answer 2

H+

Question 3

Strong acid definition

Answer 3

An acid that disassociates completely in solution

Question 4

Weak acid definition

Answer 4

An acid that dissociates only partly in solution

Question 5

Difference between strong and weak acid

Answer 5

Strong acid releases all hydrogen aroms into solution as H+ ions, and completely dissociates

Weak acids only release small proportion of available H atoms into solution as H+ ions

Question 6

Examples of bases

Answer 6

Metal oxides
Metal hydroxides
Metal carbonates
Ammonia

Question 7

Alkali definition

Answer 7

A type of base that dissolves in water releasing hydroxide ions into solution

Question 8

What forms when acid neutralised by metal hydroxide or oxide?

Answer 8

Salt + water ONLY

Question 9

Neutralisation of acids + carbonates produces…

Answer 9

Salt + water + CO2

Question 10

Extra: explain dissociation of strong acids with 2 H (eg H2SO4)

Answer 10

All molecules dissociate, release ONE H+ ion
Resulting HSO4- ions partially dissociate - not all of them release a H+ ion.

So:
Sulfuric acid first behaves as strong acid
The HSO4- ions produced behave as weak acid