Across
- 3. - A reaction in which energy is absorbed
- 5. - A material that increases the rate of a reaction by lowing the activation rate
- 6. - Breaks down compounds into simpler products
- 9. - A reaction that releases energy in the form of heat
- 10. - Anything that has mass and takes up space
- 13. - The study of matter and how matter changes
- 17. - In chemistry, when two or more elements or compounds combine to make a more complex substance.
- 18. - Characteristic of a substance that describes it ability to change into other substances
- 21. - A material that releases energy when it burns
- 22. - When one element replaces another in a compound, or when two elements in different compounds trade places
- 23. - The minimum amount of energy needed to start a chemical reaction
Down
- 1. - Any change that alters the form or appearance of a substance but that does not make the substance into another substance
- 2. - Characteristic of a substance that can be observed without changing the substance into another substance
- 4. - A material used to decrease the rate of a reaction
- 7. - Matter is not allowed to enter or leave
- 8. - Easy way to show a chemical reaction, using symbols instead of words
- 11. - The cells in your body (as in all living things) contain biological catalyst
- 12. - A solid that forms from solution during a chemical reaction
- 13. - A principle by the French chemist Antoine Lavoisier in 1774
- 14. - A change in matter that produces one or more new substances.
- 15. - Matter can enter from or escape to the surroundings.
- 16. - rapid reaction between oxygen and a substance called a fuel
- 19. - A number placed in front of a chemical formula in an equation
- 20. - The amount of a substance in a given volume