Chemical Foundation of Life

7. a bond that holds two atoms together by sharing valence electrons
8. one of the small units that make up polymers
9. a chemical reaction that releases energy to the surroundings
10. an exothermic biological reaction in organisms in which smaller molecules are produced from larger ones
12. negative charge particle in an atom
14. a type of carbohydrate that could be glucose, fructose etc
18. a biological molecule that speeds up chemical reactions in living things
19. the random spreading out of particles from high concentration to low concentration
20. an atom or molecule with a charge
22. an endothermic biological reaction in organisms in which larger molecules are formed from smaller ones
23. positive charge particle found in the nucleus of an atom
25. substance with a unique, fixed composition that consists of two or more elements
27. organic compound polymer made up of amino acids

1. energy needed to start a chemical reaction
2. organic compound polymer such as sugar or starch
3. small molecule (monomer) that is a building block of proteins
4. a long chain molecule made of smaller units joined together
5. a mixture in which the composition is not uniform throughout the mixture
6. natural polymer of monomers of glucose and makes up structures in living things, such as the cell wall in plants
11. a chemical reaction that absorbs energy from the surroundings
13. compound found in living things that contains mainly carbon
15. when the molecules of a substance are attracted (and stick slightly) to the molecules of a different substance
16. a mixture in which the composition is uniform throughout the mixture
17. neutral particle found in the nucleus of an atom
21. pure substance that cannot be broken down into other types of substances
24. the positively charged center of the atom consisting of protons and neutrons
26. a molecule that has an imbalance of charge because the shared valence electrons in the covalent bond are not shared equally