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
Extracting Metals and Equilibria
The Haber process and its conditions
- 3 things to know
- Paper 3
Overview
The word and symbol equations for ammonia, where the nitrogen and hydrogen come from, the 450 °C, 200 atmospheres and iron catalyst, and why the reaction never goes to completion.
What you need to know
Answer each one before you reveal it.
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Key term
Write the balanced symbol equation for the formation of ammonia from nitrogen and hydrogen.
Key term
In what ratio do nitrogen and hydrogen molecules combine when ammonia is formed?
Questions from this subtopic
Each one with the model answer underneath.
- 1
Write the word equation for the formation of ammonia from its elements.
Model answer
Nitrogen + hydrogen ⇌ ammonia.
- 2
Write the balanced symbol equation for the formation of ammonia from nitrogen and hydrogen.
Model answer
N₂ + 3H₂ ⇌ 2NH₃.
- 3
Where is the nitrogen used to make ammonia obtained from?
Model answer
It is obtained from the air, which is about 78% nitrogen.
- 4
Where is the hydrogen used to make ammonia obtained from?
Model answer
It is obtained from natural gas.
- 5
In what ratio do nitrogen and hydrogen molecules combine when ammonia is formed?
Model answer
One nitrogen molecule combines with three hydrogen molecules.
- 6
Why can the reaction between nitrogen and hydrogen never convert all the reactants into ammonia?
Model answer
The reaction is reversible and settles at a dynamic equilibrium, so some ammonia is always breaking back down.
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