AQA GCSE Chemistry (8462) –
Comprehensive Exam Revision Notes and
Q&A, AQA, GCSE (9–1) – Complete
Specification Coverage
Introduction:
This document provides a full set of AQA GCSE Chemistry
revision notes presented in a clear question-and-answer
format, covering the entire specification. Topics include atomic
structure, bonding, quantitative chemistry, energy changes,
rates of reaction, electrolysis, organic chemistry, chemical
analysis, and all required practicals, making it ideal for
thorough exam preparation and last-minute revision.
Exam Questions and Answers:
What do acids form in water? ---Correct Answer---Positive
hydrogen ions
What do alkalis form in water? ---Correct Answer---Negative
hydroxide ions
,Symbol equation of neutralisation ---Correct Answer---
H(positive) + OH(negative) --> H2O
What do strong acids do in water? ---Correct Answer---They
ionise completely - all acid particles dissociate to release
positive hydrogen ions
What do weak acids do in solution? ---Correct Answer---They
don't fully ionise in solution - only a small proportion of acid
particles dissociate to release positive hydrogen ions
Examples of strong acids ---Correct Answer---Sulfuric acid
Hydrochloric acid
Nitric acid
Examples of weak acids ---Correct Answer---Ethanoic acid
Citric acid
Carbonic acid
How do acids react? ---Correct Answer---The positive
hydrogen ions react with other substances
,What happens if the concentration of positive hydrogen ions is
higher? ---Correct Answer---The rate of reaction will be faster,
therefore strong acids will be more reactive than weak acids of
the same concentration
What is pH? ---Correct Answer---A measure of the
concentration of positive hydrogen ions in the solution
For every decrease of 1 on the pH scale... ---Correct Answer---
...The concentration of positive hydrogen ions increase by a
factor of 10 - Logarithmic
E.g. pH 4 has 10 times the concentration of pH 5
What does acid strength tell you? ---Correct Answer---What
proportion of the acid molecules ionise in water
Are metal oxides and hydroxides bases or acids? ---Correct
Answer---Bases
Are metal carbonates bases or acids? ---Correct Answer---
Bases
, Equation with a metal carbonate ---Correct Answer---Acid +
metal carbonate --> salt + water + carbon dioxide
Reactivity series ---Correct Answer---Potassium
Sodium
Lithium
Calcium
Magnesium
Aluminium
CARBON
Zinc
Iron
Tin
Lead
HYDROGEN
Copper
Silver
Gold
Platinum
Comprehensive Exam Revision Notes and
Q&A, AQA, GCSE (9–1) – Complete
Specification Coverage
Introduction:
This document provides a full set of AQA GCSE Chemistry
revision notes presented in a clear question-and-answer
format, covering the entire specification. Topics include atomic
structure, bonding, quantitative chemistry, energy changes,
rates of reaction, electrolysis, organic chemistry, chemical
analysis, and all required practicals, making it ideal for
thorough exam preparation and last-minute revision.
Exam Questions and Answers:
What do acids form in water? ---Correct Answer---Positive
hydrogen ions
What do alkalis form in water? ---Correct Answer---Negative
hydroxide ions
,Symbol equation of neutralisation ---Correct Answer---
H(positive) + OH(negative) --> H2O
What do strong acids do in water? ---Correct Answer---They
ionise completely - all acid particles dissociate to release
positive hydrogen ions
What do weak acids do in solution? ---Correct Answer---They
don't fully ionise in solution - only a small proportion of acid
particles dissociate to release positive hydrogen ions
Examples of strong acids ---Correct Answer---Sulfuric acid
Hydrochloric acid
Nitric acid
Examples of weak acids ---Correct Answer---Ethanoic acid
Citric acid
Carbonic acid
How do acids react? ---Correct Answer---The positive
hydrogen ions react with other substances
,What happens if the concentration of positive hydrogen ions is
higher? ---Correct Answer---The rate of reaction will be faster,
therefore strong acids will be more reactive than weak acids of
the same concentration
What is pH? ---Correct Answer---A measure of the
concentration of positive hydrogen ions in the solution
For every decrease of 1 on the pH scale... ---Correct Answer---
...The concentration of positive hydrogen ions increase by a
factor of 10 - Logarithmic
E.g. pH 4 has 10 times the concentration of pH 5
What does acid strength tell you? ---Correct Answer---What
proportion of the acid molecules ionise in water
Are metal oxides and hydroxides bases or acids? ---Correct
Answer---Bases
Are metal carbonates bases or acids? ---Correct Answer---
Bases
, Equation with a metal carbonate ---Correct Answer---Acid +
metal carbonate --> salt + water + carbon dioxide
Reactivity series ---Correct Answer---Potassium
Sodium
Lithium
Calcium
Magnesium
Aluminium
CARBON
Zinc
Iron
Tin
Lead
HYDROGEN
Copper
Silver
Gold
Platinum
