Across
- 3. A rapid reaction between oxygen and a substance called fuel
- 4. reaction in which energy is absorbed.
- 6. Matter can enter from or escape to the surroundings.
- 9. A material used to decrease the rate of a reaction.
- 11. in front of chemical formula in an equation.
- 13. in your body contain biological catalysts.
- 14. Substances you have at the
- 15. material that increases the rate of a reaction by lowering the activation energy
- 16. One element replaces another in a compound or when two elements in different compounds trade places.
- 18. reaction, using symbols instead of words.
- 19. A solid that forms from solution during a chemical reaction
- 22. A short,easy way to show a
- 23. Characteristics of a substance that describes its ability to change into other substances.
- 24. Matter is not allowed to enter or leave.
- 26. that has mass and takes up space.
- 27. A characteristic of a substance that can be observed without changing the substance
Down
- 1. reaction that releases energy in the for of heat.
- 2. Material that releases energy when it burns.
- 5. Minimum amount of energy needed to start a chemical reaction
- 7. When the reaction is complete, you have a new substance
- 8. A change that alters the form or appearance of a substance but that does not make the substance into another substance.
- 10. Amount of a substance in a given volume
- 12. A Principle
- 17. A change in matter that produces one or more new substances is a chemical change.
- 20. in contrast to a synthesis reaction.
- 21. The study of matter and how matter changes.
- 25. When two or more elements or compounds combine to make a more complex substance.