Cal's science sec 1,3,4 key terms
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Created by:
lvascience on April 17, 2012
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29 terms
Terms | Definitions |
|---|---|
 matter | anything that has mass and takes up space |
| chemistry | the study of the properties of matter and how matter changes |
| substance | A single kind of matter that is pure and has a specific set of properties |
| physical property | A characteristic of a pure substance that can be observed without changing it into another substance |
| chemical property | A characteristic of a pure substance that describes its ability to change into different substances |
| element | A pure substance that cannot be broken down into simpler substances |
| atom | The basic particle from which all elements are made |
| chemical bond | A force of attraction between two atoms |
| molecules | groups of two or more atoms held together by chemical bonds |
| compound | a pure substance made of two or more elements chemically combined |
| chemical formula | shows the elements in the compound and the ratio of atoms |
| mixture | two or more substances that have been mixed together but not chemically combined |
| heterogeneous mixture | a mixture in which different materials can be distinguished easily |
| homogeneous mixture | a type of mixture in which the substances are so evenly distributed that it is difficult to distinguish one substance in the mixture from another |
| solution | a homogeneous mixture of two or more substances |
| physical change | any change that alters the form or appearance of matter but does not make any substance in the matter into a different substance |
| chemical change | a change in matter that produces one or more new substances |
| law of conservation of mass | the law that states that mass cannot be created or destroyed in ordinary chemical and physical changes |
| energy | the ability to do work or cause change |
| Temperature | the measure of the average energy of a random motion of particles of matter |
| thermal energy | the total energy of all the particles in an object |
| endothermic change | change in which energy is taken in |
| exothermic change | change in which energy is released |
| kinetic energy | energy of matter in motion |
| potential energy | energy an object has because of its position |
| chemical energy | the energy stored in chemical bonds |
| electromagnetic energy | a form of energy that travels through space as waves |
| electrical energy | the energy of electrically charged particles moving from one place to another |
| electrodes | metal strips placed in solution that do not touch |
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