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Across 3. positively and negatively charged atoms 4. basic unit of matter 8. elements or compounds produced by a chemical reaction 9. contains sugar ribose 14. negatively charged particle 16. any compound that forms H+ ions in solution 19. attraction between molecules of different substance 20. has three parts: 5-carbon sugar, phosphate group, and a nitrogenous base 22. energy needed to get a reaction started 26. atoms of the same element that differ in the number of neutrons they contain 31. single sugar molecules 32. the reactants of enyzme-catalyzed reactions 33. smallest unit of most compounds 34. material composed of two or more elements or compounds that are physically mixed but not chemically

Down 1. proteins that act as biological catalysts, speeds up chemical reactions that take place in cells 2. substance that is dissolved 5. macromolecules that contain nitrogen as well as carbon, hydrogen, and oxygen 6. proteins are polymers of molecules 7. formed when one or more electrons are transferred from one atom to another 8. large macromolecules formed from monosaccharides 10. formed when electrons are shared between atoms 11. process that changes one set of chemicals into another set of chemicals 12. are compounds made up of carbon,hyrdogen,and oxygen atoms. 2:1:1 13. mixtures of water and nondissolved material 15. protons and neutrons together form the 17. substance that speeds up the rate of a chemical reaction 18. mostly from hyrdogen and carbon atoms, used to store energy 21. any compound that produces hydroxide ions in solution 23. macromolecules containing hydrogen, oxygen, nitrogen, carbon,and phosphorus 24. elements or compounds that enter into a chemical reaction 25. the ions gradually become dispersed in the water forming this mixture 27. subtance in which the solute dissolves 28. substance formed by chemical combintion of two or more elements in definite proportions 29. attraction between molecules of the same substance 30. chemical is a pure substance that consiss entirely of one type of atom