A chemical reaction ALWAYS forms a new substance. Signs that show a chemical reaction has taken place are: i. A change in colour ii. A change in temperature (usually gets hot) Types of reaction Burning Decomposition Oxidation and reduction Neutralization … Continue reading →
Elements, compounds and mixtures Elements in the Earth’s crust Obtaining metals from their ores There are about 100 elements in total, although only about 20 are in everyday use. An element is the simplest of all chemical substances. It … Continue reading →
Chemical change The three states of matter Change in Mass The Water Cycle Heating copper sulphate Heating magnesium ribbon If a solid chemical is heated several things could happen: It could melt (change from a solid to a liquid) … Continue reading →
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