Key term
AQA GCSE Combined Science Chemistry 8464
Atomic Structure and the Periodic Table
Topic overviewAtoms, elements and compoundsWord equations, symbols and balanced equationsMixturesFrom the plum pudding model to the nuclear modelBohr, Chadwick and the modern model of the atomRelative electrical charges of subatomic particlesSize and mass of atomsRelative atomic mass and electronic structureThe periodic tableDevelopment of the periodic tableMetals and non-metalsGroup 0Group 1Group 7
Bonding, Structure, and the Properties of Matter
Topic overviewChemical bonds, including metallic bondingIonic bondingIonic compoundsCovalent bonding and how it is representedThe three states of matter and changes of statePredicting state, state symbols, and the limits of the particle modelProperties of ionic compoundsProperties of small moleculesPolymers and giant covalent structuresProperties of metals and alloys, and why metals conductDiamond and graphiteGraphene and fullerenes
Chemical Analysis
Chemical Changes
Topic overviewThe reactivity seriesMetal oxides, extraction, and redox in terms of electronsAcids reacting with metals, neutralisation and saltsSoluble saltsThe pH scale and neutralisationStrong and weak acidsThe process of electrolysis, and molten ionic compoundsUsing electrolysis to extract metalsElectrolysis of aqueous solutionsRepresentation of reactions at electrodes as half equations
Chemistry of the Atmosphere
Topic overviewThe Earth's early atmosphereHow oxygen increased and carbon dioxide decreasedThe gases in today's atmosphere, and which are greenhouse gasesHuman activities which contribute to an increase in greenhouse gases in the atmosphereGlobal climate change and carbon footprintsAtmospheric pollutants from fuels, and their effects
Energy Changes
Organic Chemistry
Quantitative Chemistry
The Rate and Extent of Chemical Change
Topic overviewMeasuring the mean rate of a reactionRate from graphs, and the gradient of a tangentFactors which affect the rates of chemical reactionsCollision theory and activation energyCatalystsReversible reactions and dynamic equilibriumThe effect of changing conditions on equilibriumThe effect of changing concentrationThe effect of temperature changes on equilibriumThe effect of pressure changes on equilibrium
Chemical Changes
Acids reacting with metals, neutralisation and salts
- 3 things to know
- Chemistry Paper 1
Overview
Metals reacting with dilute acids to give a salt and hydrogen, the test for hydrogen, these reactions as redox in terms of electrons, neutralisation of acids by alkalis, bases and metal carbonates, the difference between a base and an alkali, naming salts from their acids, and deducing salt formulae from their ions.
What you need to know
Answer each one before you reveal it.
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Key term
Name the two products formed when a dilute acid reacts with a suitable metal.
Key term
Write a word equation for zinc reacting with dilute hydrochloric acid.
Questions from this subtopic
Each one with the model answer underneath.
- 1
Name the two products formed when a dilute acid reacts with a suitable metal.
Model answer
A salt and hydrogen.
- 2
Write a word equation for zinc reacting with dilute hydrochloric acid.
Model answer
Zinc + hydrochloric acid → zinc chloride + hydrogen.
- 3
Describe the test that identifies the gas given off when magnesium is added to dilute acid.
Model answer
A lighted splint is held at the mouth of the tube and the gas burns with a squeaky pop, showing hydrogen.
- 4
Explain, in terms of electrons, why the reaction between magnesium and hydrochloric acid is a redox reaction.
Model answer
The magnesium atoms lose electrons while the hydrogen ions gain them, so oxidation and reduction happen together.
- 5
In Zn + 2HCl → ZnCl₂ + H₂, which species gains electrons?
Model answer
The hydrogen ions, which gain electrons and become hydrogen molecules.
- 6
When iron reacts with dilute sulfuric acid, which substance is oxidised?
Model answer
The iron, which turns into iron ions in the salt.
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