Atoms, Elements and CompoundsAQA GCSE Chemistry: Flashcards

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What is an atom?

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What is an atom?: The smallest part of an element that can exist.
What is an element?: A substance made of only one type of atom.
What is a compound?: Two or more elements chemically combined together, with properties different from the original elements.
What is a mixture?: Two or more elements or compounds that are not chemically combined; each keeps its own properties.
How can a compound be separated back into its elements?: Only by a chemical reaction, never by physical means.
What does the formula NaCl represent?: Sodium chloride — one sodium atom combined with one chlorine atom.
Write the balanced symbol equation for magnesium burning in oxygen.: 2Mg + O2 → 2MgO
Which technique separates an insoluble solid from a liquid?: Filtration.
Which technique separates a soluble solid from a solution?: Crystallisation — evaporating the solvent.
Which technique separates a mixture of liquids with different boiling points?: Fractional distillation.
What does chromatography separate substances based on?: Their distribution between a stationary phase and a mobile phase.
How can you tell a mixture of iron and sulfur apart from the compound iron sulfide?: A magnet attracts the iron in the mixture, but not in the compound iron sulfide.