Across
- 3. of Conservation of Mass states that for any system closed to all transfers of matter and energy (both of which have mass), the mass of the system must remain constant over time, as system mass cannot change quantity if it is not added or removed.
- 4. A material that increases the rate of a chemical reaction by lowering the activation energy
- 5. A biological catalyst that lowers the activation energy of reactions in cells
- 7. science) A substance formed as a result of a chemical reaction
- 8. A number placed in front of a chemical formula in an equation that indicates how many atoms or molecules of each reactant and product are involved in a reaction
- 9. The amount of one material dissolved in a given amount of another material
- 13. A number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound
Down
- 1. A reaction that absorbs energy in the form of heat
- 2. A substance that enters into a chemical reaction
- 6. equation A short, easy way to show a chemical reaction, using symbols instead of words
- 7. A solid that forms from a solution during a chemical reaction
- 10. A reaction that releases energy in the form of heat
- 11. energy The minimum amount of energy needed to start a chemical reaction
- 12. A material that decreases the rate of a reaction