Chemical Reactions: Bonding What you may already know:
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A new substance is formed in a chemical reaction. Reactions can be endothermic or exothermic.
The rate of a reaction can be changed by a number of factors, such as temperature.
What you will learn in this chapter:
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Different types of chemical reactions. How metals react.
How to use the periodic table to predict the chemical formula of various compounds.
How to investigate the properties of different materials.
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Why is the chemical formula for water H2O?
Where does paper go when it is burned?
Can you crack this code? The first letter of each of these images spells out a key word that you will come across in this section. Use the hints provided if you need to, or revisit the Puzzler after you finish this chapter.
1. 2. 3.
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Chemical name for rust 236 1. ___
Essential element for combustion
2. ___ Ar Xe 3. ___ Ne
Group of odourless, colourless gases with low reactivity