Across
- 3. The tendency of energy to disperse
- 6. The attrition of water molecules for each other
- 7. Pure substance made of only one kind of atom
- 8. Class of organic compounds that serve as the building blocks for the information storage molecules: DNA and RNA
- 11. The substance formed during a chemical reaction
- 12. A measurement of the speed at which particles move
- 13. Changes that don't change matters identity
- 14. Nonpolar molecules
- 18. Basic building blocks of matter
- 19. Organic compounds made of carbones, hydrogens and oxygen
Down
- 1. A naturally occurring catalyst, usually a protein
- 2. A pure substance made of two or more elements chemically combined
- 4. A substance that is present before a chemical reaction
- 5. Attrition of particles in one substance for particles in a different substance
- 9. A change in substances that results in one or more new substances being formed
- 10. The immaterial stuff that gets things done
- 15. A substance that provides a alternate route from reactants to products
- 16. A class of organic compounds that serve as the building blocks of proteins
- 17. Simple carbohydrate
- 20. Stored chemical energy that holds two atoms together