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Across 1. New substances formed as a result of a chemical reaction 10. Mixture of water and non-dissolved materials 11. The attraction of like molecules or substances 13. Chemical bond formed by the sharing of electrons 15. Energy needed to start a chemical reaction 17. A compound that produces hydroxide (OH-) ions when dissolved in water 18. A large macromoleucle formed by monosaccharide 20. Charged particles 21. Material composed of two or more elements or compounds that are physically mixed not chemicallycombined 22. Nucleic acid that stores and transmits genetic information 24. Unit of nucleic acid that is made up of a 5 carbon sugar, a phosphate group and a nitrogenous base 27. Compound with an amino group (NH2) on one end and a carboxyl group (COOH) on the other end 29. A negatively charged particle, located outside the atomic nucleus 30. A substance that affects the rate of a chemical reaction without being used up in the reaction 32. Any substance that is made up of only one type of atom 35. Macromolecule that contains C, H, and N; needed by the body for growth and repair and to make enzymes 37. A substance that undergoes a change in a chemical reaction 38. Substance that is dissolved in a solvent to make a solution. 39. Compound formed by combinations of monomers 40. Weak acid or base that neurtralizes a stong acid or base 41. The smallest unit of an element

Down 2. A substance that undergoes change in chemical reaction 3. Slight attraction that develops between the oppositely charged regions of nearby molecules 4. Compound that releases hydrogen ions (H+) in a solution 5. A single sugar 6. Measurement system ranges from 0 to 14 and indicates the relative concentrations of hydrogen ions and hydroxide ions 7. Atom of an element that has a number of neutrons different from that of other atoms of the same element 8. Nucleic acid made of a single chain of nucleotides that acts as a messenger 9. Any process in which a chemical change occurs. 12. The force that holds cations and anions together, electrons are transferred 14. Macromolecule containing H, O, N, C and P 16. Compound made up of C, H and O atoms; major source of energy for the human body 19. Substance formed by the chemical combination of two or more elements in definite proportins 23. Reactant of an enzyme catalyzed reaction 25. A evenly distributed mixture of a solvent and solute 26. Smallest unit of most compounds 28. The attraction of different substances 31. Substance in which a solute is dissolved for a solution 33. Smallest unit that can join together with other small units to form poymers 34. The center of an atom 36. Macromolecule made mainly from C and H atoms, include fat, oils and waxes