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Matter and Energy
Unit 1, Lessons 1-6
Term | Definition |
---|---|
Matter | Anything that has mass and takes up space. |
Mass | A measure of the amount of matter in an object. |
Weight | A measure of the gravitational force exerted on an object. |
Volume | The amount of space that an object takes up or occupies. |
Density | The ratio of the mass of a substance to the volume of the substance. |
Physical Property | A characteristic of a substance that does not involve a chemical change, such as density, color, or hardness. |
Chemical Property | A property of matter that describes a substances ability to participate in chemical reactions. |
Physical Change | A change of matter from one form to another without a change in chemical properties. |
Chemical Change | A change that occurs when one or more substances change into entirely new substances with different properties. |
Law of Conservation of Mass | The law that states that mass cannot be created or destroyed in ordinary chemical and physical change. |
Atom | The smallest unit of an element that maintains the properties of that element. |
Element | A substance that cannot be separated or broken down into simpler substances by chemical means. |
Compound | A substance made up of atoms of two or more different elements joined by chemical bonds. |
Mixture | A combination of two or more substances that are not chemically combined. |
Pure Substance | A sample of matter, either a single element or a single compound, that has definite chemical and physical properties. |
Heterogeneous | Describes something that does not have a uniform structure or composition throughout. |
Homogeneous | Describes something that has a uniform structure or composition throughout. |
Solid | The state of matter in which the volume and shape of a substance are fixed. |
Liquid | The state of matter that has a definite volume but not a definite shape. |
Gas | A form of matter that does not have a definite shape or volume. |
Freezing | The change of state from a liquid to a solid. |
Melting | The change of state from a sold to a liquid. |
Evaporation | The change of state from a liquid to a gas that usually occurs at the surface of a liquid over a wide range of temperatures. |
Boiling | The change of state from a liquid to a gas that occurs at a specific temperature. |
Condensation | The change of state from a gas to a liquid. |
Sublimation | The change of state from a solid directly to a gas. |
Deposition | The change of state from a gas directly to a solid. |