| A | B |
|---|
| element | cannot be chemically broken down into simpler substances |
| compound | substance made of two or more chemically combined elements |
| mixture | two or more substances physically combined |
| substance | any element or compound |
| molecule | smallest part of a substance that contains all the properties |
| chemical bond | force of attraction that holds atoms together |
| valence electron | electron in the outermost energy level of an atom |
| ion | atom with an electrical charge |
| ionic bond | formed between atoms that have gained or lost electrons |
| covalent bond | formed when atoms share electrons |
| organic compound | compound containing carbon |
| organic chemistry | study of organic compounds |
| structural formula | molecular model that useds straight lines to indicate bonds |
| polymers | large molecules formed by smaller molecules |
| carbohydrates | sugars and starches |
| lipids | fats and oils |
| proteins | compounds used to build and repair body tissues |
| amino acids | building blocks of proteins |
| nucleic acids | compounds composed of carbon, oxygen, hydrogen, nitrogen, and phosphorus |
