| A | B |
|---|
| acid | compounds whose characteristics include tasting sour, reacting with metals and carbonates, and turning blue litmus paper red |
| corrosive | meaning that the substance "eats away" at other material |
| base | compounds whose characteristics include tasting bitter, feeling slippery when rubbed between fingers, and turning red litmus paper blue |
| indicator | a compound that changes color when in contact with an acid or a base; safe way to test for acids and bases |
| hydrogen ion (H+) | an atom of hydrogen that has lost its electron; produced in reactions with acids |
| hydroxide ion (OH-) | a negative ion made of oxygen and hydrogen; produced in reactions with bases |
| pH scale | a range of values from 0 to 14 to express the concentration of hydrogen ions in a solution |
| neutralization | a reaction between an acid and a base to form a neutral solution with a pH of 7 |
| salt | an ionic compound that can be produced from the neutralization of an acid with a base |
| digestion | the process of breaking down the complex molecules of food into smaller molecules that the body can use |
| mechanical digestion | physical process in which large pieces of food are torn and ground into smaller pieces |
| chemical digestion | chemical process of breaking large food molecules into smaller molecules through the action of enzymes and other digestive juices |
