bubbling1.gifmulti-word fill quiz 7Fwf1 on "Simple chemical reactions"
(a doc brown worksheet for QCA KS3 science-chemistry)

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1. Hydrogen and carbon dioxide are . If they are formed in a reaction you will see . This can be a sign that a chemical has happened.

2. Other signs of a chemical reaction might be an increase in temperature if is released or a change in .

3. Physical changes like do not make new materials and are easily eg by cooling, which causes .

4. The substances you start with are called , and after the chemical change, what is formed are called the .

5. Zinc consists of only one type of atom, so it is called an .

6. Carbon dioxide is made up of combining the different atoms carbon and oxygen, and is known as a .

7. A shorthand way of representing a chemical change is to use a .

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