| A | B |
|---|
| matter | anything that has mass and takes up space |
| chemistry | the study of matter and how matter changes |
| physical property | a characteristic of a substance that can be observed without changing the substance into another substance |
| chemical property | a characteristic of a substance that describes its abiity to change into other substances; can only be observed when the substance is changed into another substance |
| physical change | any change that alters the form or appearance of a substance but that does not make the substance into another substance; a change in which no new substance is formed |
| chemical reaction (chemical change) | a change in matter that produces one or more new substances; a change in which new substances are formed with properties very different from the original substance |
| When do chemical changes occur? | when bonds break and new bonds form |
| How can one tell when a chemical reaction occurs? | two main kinds of changes can be ovserved - the formation of new substances and changes in energy |
| precipitate | a solid that forms from solution during a chemical reaction |
| endothermic reaction | a reaction in which energy (heat) is absorbed |
| exothermic reaction | a reaction that releases energy in the form of heat |
