C2.1 Elements, compounds and mixtures

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4 Terms

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What is an element?

  • A substance made of atoms that all contain the same number of protons and cannot be split into anything simpler

    • Examples: hydrogen, carbon, oxygen

<ul><li><p>A substance made of atoms that all contain the same number of protons and cannot be split into anything simpler</p><ul><li><p>Examples: hydrogen, carbon, oxygen </p></li></ul></li></ul><p></p>
2
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What is a compound?

  • A pure substance made up of two or more different elements chemically combined

    • It can only be split into different elements through chemical reactions

<ul><li><p>A pure substance made up of two or more different elements chemically combined</p><ul><li><p>It can only be split into different elements through chemical reactions</p></li></ul></li></ul><p></p>
3
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What is a mixture?

  • A combination of two or more substances (elements and/or compounds)that are not chemically combined

    • It does not require a chemical reaction to be split

<ul><li><p>A combination of two or more substances (elements and/or compounds)that are not chemically combined</p><ul><li><p>It does not require a chemical reaction to be split</p></li></ul></li></ul><p></p>
4
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What is a molecule?

  • A group of two or more atoms (from the same or different elements) that are chemically bonded together

<ul><li><p>A group of two or more atoms (from the same or different elements) that are chemically bonded together</p></li></ul><p></p>