Chemistry in Biology

2. substance that speeds up a chemical reaction
3. molecule with oppositely charged regions
8. substance dissolved in a solution
9. substance in which another substance is dissolved
11. two or more atoms of the same element having different numbers of neutrons
12. substance that exists before a chemical reaction
15. a pure substance composed of only one type of atom
16. compound whose atoms are held together by
18. reactant to which an enzyme binds
20. particle without charge
22. an electrical attraction between two oppositely charged atoms or groups of atoms
25. minimum amount of energy needed for reactants to form products in a chemical reaction
27. an atom that is positively or negatively charged because it has lost or gained electrons
28. substance that releases hydrogen ions when dissolved in water
29. protein that speeds up a biological reaction; biological catalyst
30. substance that produces hydroxide ions when dissolved in water

1. attractive forces between molecules
3. measure of the concentration of hydrogen ions in a solution
4. a mixture that can react with an acid or base to maintain the pH of a solution within a specific range
5. a type of chemical bond formed when atoms share electrons
6. the specific place where a substrate binds on an enzyme
7. energy-requiring process by which atoms or groups of atoms in substances are changed into different substances
10. a combination of two or more different substances in which each substance keeps its individual characteristics
13. weak electrostatic bond formed by the attraction of opposite charges between a H atom and an O, N, Fl atom
14. a pure substance with unique properties, formed when two or more different elements combine
17. positively charged particle
19. negatively charged particle
21. homogeneous mixture formed when a substance (the solute) is dissolved in another substance (the solvent)
23. building block of matter
24. substance formed by a chemical reaction
26. contains neutrons and protons