Chemical Reactions

Science — Second Preparatory

Applications and examples

Comparison aspect	Main idea	Keywords
Example 1: rusting of iron.	Iron reacts with oxygen and moisture in the air to form brown iron oxide. Rust is a new substance with properties different from iron which is why iron needs a coating to prevent rusting	reactsoxygenmoistureform
Example 2: burning natural gas.	Methane reacts with oxygen in a reaction that releases heat and light and produces carbon dioxide and water vapour	Methanereactsoxygenreaction
Example 3: baking bread.	During baking the ingredients of the dough react and carbon dioxide gas produced by the yeast makes the dough rise and become soft. This shows a chemical reaction inside the dough while it is heated	Duringingredientsdoughreact

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