Multi-word fill quiz Q1 on "Simple Chemical Reactions" © Doc Brown's KS3 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 .