Across
- 5. a solid that forms a solution during a chemical reaction
- 7. the process in which substances undergo chemical changes that result in the formation of new substances
- 9. a characteristic of a substance that can be observed or measured without changing the identity of the substance
- 10. An easy way to show a chemical reaction using symbols
- 11. a biological catalyst that lowers the activation energy of of reactions in cells
- 14. anything that has mass and occupies space
- 15. a material that releases energy energy when it burns
- 17. a chemical reaction that breaks down compounds into simpler products
- 20. a change to the physical properties of a substance.
- 21. the amount of one material in a certain volume of another material
Down
- 1. the study of the properties of matter and how matter changes
- 2. a reaction that releases energy in the form of heat
- 3. a material that decreases the rate of a reaction
- 4. The principle stating that matter is not created or destroyed during a chemical reaction
- 6. a system in which no matter is allowed to enter or leave
- 8. a chemical reaction in which two or more simple substances combine to form a new, more complex substance
- 10. a number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction
- 11. chemical reactions in which the reactants absorb heat energy from the surroundings to form products.
- 12. a rapid reaction between oxygen and fuel that results in fire
- 13. a characteristic of a substance that describes its ability to change into different substances
- 16. a system in which matter can enter from or escape to the surroundings
- 18. the minimum amount of energy needed to get a chemical reaction started
- 19. a substance that enters into a chemical reaction
- 20. a substance formed as a result of a chemical reaction
- 22. a material that increases the rate of reaction by lowering the activation energy