| A | B |
|---|
| atoms | the units that make up all matter |
| elements | all the atoms in a sample of matter have the same identity, or are alike |
| compound | atoms of two or more elements combined with the ratio of the different atoms always being the same |
| substance | matter that is an element or compound and cannot be reduced to a more basic component by a physical process |
| mixture | a material made up of two or more substances that can be separated by physical means |
| heterogeneous mixture | type of mixture in which different materials can be easily distinguished by the eye or a microscope and sometimes easily separated by hand or with the eye |
| heterogeneous mixture | examples,pizza, concrete, vegetable soup, Italian dressing, a bag of assorted candies |
| homogeneous mixture | type of mixture in which two or more substances are uniformly spread out or blended making the mixture look the same throughout |
| homogeneous mixture | examples,saltwater, tomato soup, rubbing alcohol,root beer/sodas |
| solution | another name for a homogeneous mixture in which the particles remain constantly and uniformly mixed (never settle) and cannot be seen with a microscope |
| colloid | a heterogeneous mixture containing tiny particles that never settle out or separate; particles are large enough to scatter light; for example milk and jello |
| Tyndall effect | scattering of light by particles in a mixture and can be seen in all colloids |
| suspension | a heterogeneous mixture containing a liquid in which visible particles settle Italian dressing |
| coagulation | process that destroys colloid structure and can be used to reduce a colloidal form of air pollution |
| physical property | any characteristic of a material that can be observed without changing the substances that makeup the material |
| physical change | a change in size, shape, odor, or state of matter |
| chemical change | a change of one substance in a material to a different substance |
| chemical property | a characteristic that helps identify a substance by describing how the substance will undergo a chemical change |
| law of conservation of mass | explains that matter is neither created nor destroyed during a chemical change |
