Compounds and Chemical equations

• Compound


  A substance made up of two or more different elements chemically combined in a fixed proportion
• Chemical equation


  A representation of a chemical reaction using chemical symbols and formulas
• The properties of a compound are not always similar to those of the elements that make it up
• There are 1 carbon atom in a molecule of calcium carbonate, CaCO3
• Reactants are found on the left-hand side of a chemical equation
• Forming aluminium oxide


  2 atoms of aluminium, Al, react with 3 atoms of oxygen, O, to form 1 molecule of aluminium oxide
• Separation process


  A process needed to separate a compound into its elements
• Compounds often have totally different properties to the original elements
• There is one carbon atom in a molecule of CaCO3 (plus one calcium atom and three oxygen atoms)
• The left-hand side (of a chemical equation)
• Compound


  A substance formed from two or more different elements in fixed proportions, held together by chemical bonds