Chemical Reactions

1234567891011
Across
  1. 1. A sign that a chemical reaction has happened is a change in _ _ _ _ _ _.
  2. 6. After a chemical change, the substance you are left with are what?
  3. 8. A shorthand way to represent a chemical change is to use a what?
  4. 9. Zinc only contains one type of atom so it is called a what?
  5. 11. Hydrogen and Carbon Dioxide are what?
Down
  1. 2. This is the process of reacting something with oxygen to create an oxide.
  2. 3. The substances you start with are called what?
  3. 4. Carbon Dioxide is make up of two elements, carbon and oxygen, so it is called a what?
  4. 5. For combustion to take place, you need a fuel, heat and what?
  5. 7. If a gas is formed in a chemical reaction you will see what?
  6. 10. Gravel is made up of different substances but you can easily separate them. This is called a what?