Element 1 Iron Magnesium Copper Element 2 Oxygen ________ Sulphur We can make compounds from elements The name of the compound can tell us what elements have combined Element 1 Iron Magnesium Copper Element 2 Oxygen ________ Sulphur Compound Iron Oxide Magnesium Oxide Copper Sulp______

Understanding equations What is a word equation?? Understanding equations Learning objectives: Write word equations Use symbols in equations

Writing a word equation A word equation can be used to describe any chemical reaction, i.e. any process in which atoms become joined in different ways. The steps for writing a word equation are: On the left-handside, put the name of the reactant(s). If there are two or more reactants, link them with a + sign. 2. In the middle, write down an arrow (). 3. On the right-handside, put the name of the product(s). If there are two or more products, link them with a + sign.

What is the word equation? Lead reacts with oxygen to form lead oxide. What is the word equation for this reaction? lead + oxygen  lead oxide Why is lead oxide so different to both lead and oxygen? The lead and oxygen don’t mix, they react to form lead oxide. This means that the lead and oxygen atoms in the product are joined differently to the atoms in the reactants .

What is the word equation? Write out word equations for the following chemical reactions. Limestone (calcium carbonate) is heated to make calcium oxide and carbon dioxide. Magnesium reacts with hydrochloric acid to make magnesium chloride and hydrogen. Methane is burnt to make carbon dioxide and water. calcium carbonate  calcium oxide +carbon dioxide magnesium + hydrochloric acid  magnesium chloride + hydrogen methane + oxygen  carbon dioxide + water

Naming simple compounds To name simple compounds of metals and non-metals: 1. Write down the name of the metal. 2. Write down the name of the non-metal, changing the ending of the word to “-ide”. What is the name of the compound made when the following elements combine? magnesium and oxygen magnesium oxide sodium and chlorine sodium chloride oxygen and iron iron oxide

Naming simple compounds What is the name of each compound formed by these metal and non-metal elements? nitrogen lithium sulphur zinc iodine nickel bromine aluminium oxygen tin chlorine sodium magnesium iron Name of compound Element 2 Element 1 iron sulphide magnesium nitride sodium chloride tin oxide aluminium bromide nickel iodide zinc sulphide lithium nitride

Chemical Symbols We can also write equations using the chemical symbols….. carbon oxygen carbon dioxide + + O C

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