| A | B |
|---|
| Compound that increases the concentration of hydrogen ions in a solution | acid |
| Organic molecule that is the building block of proteins | amino acid |
| Smallest unit of matter that can not be broken down by chemical means | atom |
| Compound that reduces the concentration of hydrogen ions in a solution | base |
| Organic compounds composed of carbon hydrogen and oxygen; used by living things as an energy source | carbohydrates |
| A chemical change that forms a new substance | chemical reaction |
| Rapid chemical combination of a substance with oxygen, producing heat and light | combustion |
| Composed of 2 or more separate elements | compound |
| To become incorporated into a liquid so as to form a solution | dissolve |
| Substance composed of a singe type of atom | element |
| The system of glands in the body that produce secretions that help to control body metabolic activity | endocrine system |
| Sub-units of fats, oils and waxes | fatty acids |
| A chemical substance produced in the body which has a specific regulatory effecton the activity of certain cells or a certain organ or organs | hormone |
| A group of organic compounds, including fatty acids, neutral fats, waxes and steroids that are insoluble in water | lipids |
| Group of atoms held together by covalent bonds | molecule |
| Organic molecule made of nucleotides; stores hereditary information for cell function | nucleic acid |
| Sub-units of nucleic acids consisting of a nitrogenous base, a sugar and a phosphate group | nucleotides |
| Measure of the acidity of a solution, representing the hydrogen ion concentration | pH |
| Organic compound made of amino acids | protein |
| The ability of a substance to dissolve | solubility |
