The Three States of Matter The three states, SOLID, LIQUID and GAS are called the three states of matter (see Kinetic Theory) The boiling point of a substance is the temperature that causes it to change from a liquid to … Continue reading →
Nearly all energy we use on the Earth starts with energy from the Sun. The Sun powers wind, tides, and the water cycle The Water Cycle • Energy from the Sun (1) causes water from the sea to evaporate (2). … Continue reading →
Rocks Most minerals come from rocks in the ground. Rocks from which we can obtain a metal are known as ores (eg Iron ore is a rock from which we can obtain iron). Some rocks (like chalk or limestone) are … 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 →
There are many substances around us. They all have their own properties which is how we recognise them. Physical properties : colour, strength, malleable or brittle, conductor or insulator, high or low density, high or low melting point Chemical properties: … Continue reading →
The kinetic theory states that all matter is made up of tiny particles that are constantly moving. Solid: The particles are held closely together in a regular pattern and can only just vibrate Liquid: The particles are still close together … Continue reading →
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