Grade 8 Natural Science
Compounds are made up of more than one kind of atom, but they always occur in fixed ratios in a chemical compound. In this lesson we are getting into the chemistry kitchen and putting pure substances together to make mixtures.
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Particle model of matter
Atoms can chemically combine to form molecules. These molecules are also particles and cannot be separated into their atoms by physical means. In this lesson we study the way in which these particles react by using the particle model of matter.
States of matter
Using the model of matter we are going to describe the three classic states of matter that we find namely solids, liquids and gases and their behaviours when their states change.
Changes of state
When a substance changes from a solid to a liquid to a gas we say that a change of state has taken place. In this lesson we learn about what happens when substances change from one state to next and how they gain or lose energy.