Key term
Edexcel GCSE Combined Science Chemistry 1SC0
Key Concepts in Chemistry
Topic overviewFormulae, word equations and balanced equationsHazard symbols and assessing riskThe changing model of the atomProtons, neutrons and electronsThe nucleus, mass number and atomic massElements and isotopesCalculating particle numbers and relative atomic massMendeleev's periodic tableHow the modern periodic table is arrangedElectronic configuration and the periodic tableHow ionic bonds formIons in ionic compoundsFormulae of ionic compoundsNaming compounds and the ionic latticeCovalent bonds and moleculesDot and cross diagrams for simple moleculesClassifying substances and the properties of ionic compoundsProperties of simple molecular substances, and forms of carbonGraphite and diamondFullerenes and graphenePolymers and models of bondingThe properties of metalsRelative formula mass and percentage compositionEmpirical and molecular formulaeConservation of mass in closed and open systemsReacting masses from balanced equationsConcentration in grams per cubic decimetre
States of Matter and Mixtures
Topic overviewThe three states of matter and changes of stateEnergy changes during changes of state, and predicting statePure substances and melting point dataChoosing a separation techniqueSeparating a mixture in practicePaper chromatography and interpreting a chromatogramInvestigating inks by distillation and chromatographyMaking water potable
Chemical Changes
Topic overviewAcids, alkalis and the pH scaleIndicators: litmus, methyl orange and phenolphthaleinInvestigating pH change when neutralising an acidBases and alkalisReactions of acids, and testing for hydrogen and carbon dioxideNeutralisation and its ionic equationPreparing soluble salts from insoluble and soluble reactantsPreparing pure, dry copper sulfate crystalsCarrying out an acid-alkali titrationSolubility rulesPredicting precipitates and preparing an insoluble saltElectrolytes and what electrolysis isMovement of ions and predicting the products of molten electrolysisElectrolysis with inert electrodesElectrolysis of copper sulfate solutionInvestigating the electrolysis of copper sulfate
Extracting Metals and Equilibria
Groups in the Periodic Table
Topic overviewThe groups of the periodic table, and the alkali metalsReactions of the alkali metals with waterThe pattern in alkali metal reactivity and why it happensPhysical properties of the halogensThe test for chlorine, and halogens reacting with metalsHydrogen halides, and explaining halogen reactivityDisplacement reactions of the halogensGroup 0: the noble gases
Rates of Reaction and Energy Changes
Fuels and Earth Science
Topic overviewHydrocarbons and crude oilFractional distillation and the fractionsProperties of the fractions and homologous seriesComplete and incomplete combustionCarbon monoxide and sootPollutants and acid rainHydrogen and fossil fuels comparedCracking and why it is necessaryThe Earth's early atmosphereHow the oceans formed and how oxygen appearedThe test for oxygen and the greenhouse gasesToday's atmosphere and evidence for climate change
Chemical Changes
Bases and alkalis
- 3 things to know
- Paper 3
Overview
What bases and alkalis are, metal oxides and hydroxides as bases, why a metal carbonate does not fit the definition of a base, and why every alkali is a base but insoluble bases such as copper oxide are not alkalis.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Key term
Give the two products always formed when a base reacts with an acid.
Key term
Copper oxide reacts with sulfuric acid to give copper sulfate and water. Name the class of compound to which copper oxide belongs.
Questions from this subtopic
Each one with the model answer underneath.
- 1
Define the term base.
Model answer
A base is a substance that reacts with an acid to form a salt and water only.
- 2
Give the two products always formed when a base reacts with an acid.
Model answer
The two products are always a salt and water.
- 3
Copper oxide reacts with sulfuric acid to give copper sulfate and water. Name the class of compound to which copper oxide belongs.
Model answer
Copper oxide is a base.
- 4
Using the definition that a base reacts with an acid to give a salt and water only, explain why a metal carbonate does not fit that definition.
Model answer
A metal carbonate also produces carbon dioxide, so a salt and water are not the only products.
- 5
Name two types of compound that act as bases.
Model answer
Metal oxides and metal hydroxides act as bases.
- 6
State whether a base has to be soluble in water.
Model answer
No, a base does not have to be soluble in water.
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