Across
- 5. Any change that alters the form or appearance of a substance but does not make that substance into another substance
- 7. A reaction that releases energy in the form of heat
- 9. A solid that forms from a solution during a chemical reaction
- 12. The substances you have at the beginning
- 13. A biological catalyst that lowers the activation energy an electron has
- 15. A characteristic that describes its ability to change into other substances
- 17. The amount of one material ina certain volume of another material
- 19. A rapid reaction between oxygen and fuel that results in fire
- 21. A change in matter that produces one or more new substances
- 22. A system in which no matter is allowed to enter or leave
- 23. A characteristic of substances that can be observed without changing the substance into another substance
- 24. Anything that has mass and takes up space
- 25. A chemical reaction that breaks down compounds into simpler products
- 26. A material that releases energy when burned
Down
- 1. A reaction which energy is absorbed
- 2. A substance formed as a result of a chemical reaction
- 3. The minimum amount of energy needed to get a chemical reaction started
- 4. A chemical reaction in which two or more simpler substances combine to form a new, more complex substance
- 6. The principle stating that matter is not created or destroyed during a chemical reaction
- 8. A short, easy way to show a chemical reaction, using symbols instead of words
- 10. A material that increases the rate of a reaction by lowering the activation energy
- 11. The study of matter and how matter changes
- 14. A material that decreases the rate of a reaction
- 16. A number in front of a chemical formula in an equation that indicates how may molecules or atoms of each reactant and product are involved in a reaction
- 18. A reaction in which one element replaces another in a compound or when two elements in different compounds trade place
- 20. A system in which matter can enter or escape to the surroundings