| A | B |
|---|
| matter | anything that has mass and takes up space |
| atom | matter is made up of |
| energy | can hold matter together or break it apart |
| protons and neutrons | found in the nucleus of an atom |
| electrons | negatively charged particles found outside the nucleus |
| element | substance that contains one type of atom |
| iron | fe |
| s | sulfur |
| carbon | c |
| compound | substance made of 2 or more elements in exact proportions |
| molecule | group of atoms held together by the energy of chemical bonds |
| molecular compounds | form when atoms share electrons |
| ions | electrically charged atoms |
| mixture | anything made up of two or more substances |
| 2 types of mixtures | solution; suspension |
| solution | mixture that is evenly mixed |
| suspension | liquid or gas has another substance spread in it; particles will settle |
| proteins | building blocks of many structures |
| amino acids | smaller molecules of proteins |
| enzymes | regulate chemical reactions in cells |
| inorganic compounds | usually made from elements other than carbon |
| water | all chemical reactions take place in ______. |
| organic compound | contain carbon and hydrogen |
| carbohydrates | supply energy for cell processes |
| lipids | store and release large amounts of energy |
| nucleic acids | store important coded information in cells; DNA |
