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Chapter 15 Vocab.
Term | Definition |
---|---|
Substance | Element or compound that cannot be broken down into simpler components and maintain the properties of the original substance. |
Element | Substance with atoms that are all alike. |
Compound | Substance formed from two or more elements in which the exact combination and proportion of elements is always the same. |
Heterogeneous mixture | Mixture such as mixed nuts or a dry soup mix, in which different materials are unevenly distributed and are easily identified. |
Homogeneous mixture | Solid, liquid, or gas that contains two or more substances blended evenly throughout. |
Solution | Homogeneous mixture that remains constantly and uniformly mixed and has particles that are so small they cannot be seen with a microscope. |
Colloid | Heterogeneous mixture whose particles never settle. |
Tyndall effect | Scattering of a light beam as it passes through a colloid. |
Suspension | Heterogeneous mixture containing a liquid in which visible particles settle. |
Physical property | Any characteristic of a material, such as size or shape, that you can observe or attempt to observe without changing the identity of the material. |
Physical change | Any change in size, shape, or state of matter in which the identity of the substance remains the same. |
Distillation | Process than can separate two substances in a mixture by evaporating a liquid and recondensing its vapor. |
Chemical property | Any characteristic of a substance, such as flammability, that indicates whether it can undergo a certain chemical change. |
Chemical change | Change of one substance into a new substance. |
Law of conservation of mass | States that the mass of all substances present before a chemical change equals the mass of all the substances remaining after the change. |