![]() The water molecule in the top right shows what a particle of water would look like (i). The following diagram shows how the three representations fit together. We say that they are three different representations of the same thing, namely water. The three diagrams above all represent water, but they are very different from each other. Your drawing may look like one of the diagrams below. Get some of the learners to redraw their pictures on the board. Perhaps one or two will draw a water molecule or the chemical formula for water. Some may draw a landscape with water (a dam or river) and others may draw a glass or similar container with clear colourless liquid inside it. The next section will show how they all fit together.ĭo not give any further instructions, but allow the learners to interpret the question in any way they want to. This will prepare us for the chapters that follow this one, in which we will be looking at different types of chemical reactions.īefore we get to chemical reactions, however, it is important that we remind ourselves of the different ways that we have been thinking about chemical compounds up to now. how to balance chemical reaction equations.how to write chemical reaction equations and.In this chapter we are going to build on these ideas. This requires that bonds are broken in the reactants and new bonds are formed in the products. During a chemical reaction, atoms are rearranged.The materials we start with are called reactants, and the new materials that form are called products. ![]() During chemical reactions, materials are changed into new materials with new chemical and physical properties.Can you remember the main ideas about chemical reactions? Here they are again: ![]() 8 Matter and Materials we learnt about chemical reactions for the first time.
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