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Across 1. A mixture in which one or more substance are uniformly distributed in another substance. 7. Are shown on the left side of the equation. 9. Are the attractive forces that hold atoms together. 10. Solutions in which water is the solvent-- are universally important to living things. 16. OH 17. Is the simplest part of a substance that retains all of the properties of that substance & can exist in a free state. 18. Is a protein or RNA molecule that speeds up metabolic reactions without being permanently changed or destroyed.

Down 1. One in which no more solute can dissolve. 2. Anything that occupies space and has mass. 3. H3O+ ion 4. Negatively charged particles. 5. Uneven distribution of charge. 6. The quanitity of matter an object has. 8. A solution is the amount of solute dissolved in afixed amount of the solution. 10. The number of protons in an atom. 11. Atoms of the same element that have a different number of neutrons. 12. Made up of atoms of two or more elements in fixed proportions. 13. Are shown on the right side. 14. An attractive force that holds molecules of a single substance together. 15. The ability to do work.