IGCSE›Cambridge IGCSE Chemistry›Mind mapsOxidesCambridge IGCSE Chemistry: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsWhat is an oxide?Compound of an element with oxygenMetals tend to form basic oxidesNon-metals tend to form acidic oxidesAcidic oxidesTypically formed by non-metalsReact with bases, not acidsExamples: SOX2\ce{SO2}SOX2 and COX2\ce{CO2}COX2Basic oxidesTypically formed by metalsReact with acids, not basesExamples: CuO\ce{CuO}CuO and CaO\ce{CaO}CaOOxideselement + oxygenCO2SO2CuOCaOZnOAmphoteric oxidesReact with both acids and basesProducts are a salt and waterKnow AlX2OX3\ce{Al2O3}AlX2OX3 and ZnO\ce{ZnO}ZnOBases and alkalisBase = oxide or hydroxide of a metalAlkali = base soluble in waterBase + acid → salt + waterBase + ammonium salt (heated) → salt + water + ammoniaAmmonia turns damp red litmus blueExam tipsNot every metal oxide is basicAlX2OX3\ce{Al2O3}AlX2OX3 and ZnO\ce{ZnO}ZnO also react with alkalisA base can be an oxide, not just a hydroxide