The Chemical Vocab

1. scale A measure of how acidic or basic a substance is, ranging from 0 to 14.
4. A substance made from two or more different elements that are chemically bonded.
7. A molecule that is the basic building block of DNA and RNA.
9. Fatty, oily, or waxy compounds that are insoluble in water and store energy.
11. A protein that acts as a catalyst to speed up specific chemical reactions in the body.
13. reaction A process where substances rearrange their atoms to form new substances with different properties.
17. A variant of a chemical element with the same number of protons but a different number of neutrons.
20. energy The minimum amount of energy required to start a chemical reaction.
22. A pure substance made of only one type of atom that cannot be broken down chemically.
23. substance that donates hydrogen ions and has a pH less than 7.
25. A particle with a positive electrical charge located in an atom's nucleus.
27. A waxy, fat-like substance made by the liver that is essential for cell function.
29. The simplest form of a carbohydrate, or a "simple sugar".
30. In chemistry, a compound that contains carbon-hydrogen bonds.
32. The molecule that an enzyme acts upon in a chemical reaction.
33. A particle with a negative electrical charge that orbits an atom's nucleus in shells.
34. bond A chemical bond formed when two atoms share pairs of electrons.

2. bond A weak attraction between a slightly positive hydrogen atom in one molecule and a slightly negative atom in another.
3. acid A large molecule, such as DNA or RNA, that carries genetic information.
5. Two or more atoms bonded together.
6. A molecule made of amino acids that is needed for the body to function properly.
8. Sugar molecules that serve as the body's main source of energy.
10. A property of a molecule that repels water.
12. acid The building blocks that combine to form proteins.
14. A property of a molecule that is attracted to and dissolves in water.
15. A substance that increases the rate of a chemical reaction without being consumed by the reaction.
16. bond A chemical bond formed by the electrical attraction between oppositely charged ions.
18. A substance that accepts hydrogen ions and has a pH greater than 7.
19. A large carbohydrate molecule composed of many monosaccharide units joined together.
21. A particle found in an atom's nucleus that has no electrical charge.
24. A very large molecule, such as a protein or nucleic acid, that is built from smaller units.
25. bond A chemical bond that links two amino acids together.
26. The basic building block of all matter, composed of protons, neutrons, and electrons.
28. shell An orbital path or energy level that electrons follow around an atom's nucleus.
31. An atom or molecule that has a net positive or negative electrical charge.