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. How do we translate between word equations, picture equations and chemical equations?.How can we tell if a reaction is balanced?. ![]() What does it mean to balance a chemical equation?.What do the numbers in a chemical reaction mean?.What do the different symbols in a chemical reaction equation mean?. ![]() How can we represent what happens in a chemical reaction?.Interpreting, writing formulae, balancing equations, comparing, drawing Interpreting, writing formulae, balancing equations, comparing Interpreting, writing formulae, balancing equations Identifying, sorting and classifying, interpreting By starting with word equations and progressing to submicroscopic representations (picture equations) before translating the latter to the symbolic format (chemical equations), we hope to build/scaffold the learning of chemical equations as well as develop learners' ability to imagine events on the submicroscopic scale.Ģ.1 Thinking about chemical equations (0.5 hours)Ģ.2 How do we represent chemical equations? (1 hour)Īctivity: Identifying the different types of equations ![]() ![]() Ultimately, they have to be able to write chemical equations, but this is a very complex skill. We have tried to introduce learners to the idea that chemical reactions can be thought of in different ways. 8 and this skill will be further reinforced in this chapter. Learners were introduced to particle diagrams in Gr. The atoms do not change only their arrangement in relation to each other changes. 8 Matter and Materials.īy this stage, learners should know that atoms are rearranged during a chemical reaction. This chapter builds on the introduction to chemical equations given in Chapter 1 and 3 of Gr.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |