| A | B |
|---|
| physical property | a characteristic of a substance that can be observed without changing the substance into another substanced |
| chemical property | a characteristic of a substance that describes its ability to change into other substances |
| matter | anything that has mass and takes up space |
| chemistry | the study of matter and how matter changes |
| physical change | any change that alters (changes) the form or appearance of a substance but that does not make the substance into another substance |
| chemical change | a change in matter that produces one or more new substances |
| chemical reaction | another name for a chemical change |
| precipitate | a solid that may appear when two solutions are mixed; a solid that form from solution during a chemical reaction |
| endothermic reaction | a reaction in which energy is absorbed; the temperature often drops |
| exothermic reaction | a reaction that releases energy in the form of heat; the temperature often rises |
| What changes in properties signal a chemical reaction (change)? | a color change; a precipitate may form; a gas might be produced and given off in the form of bubbles; other kinds of observable changes in properties |
| What changes in energy may signal a chemical change (reaction)? | some reactions absorb energy; other reactions release energy |
