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Unit 1, Lessons 1-6
Term | Definition |
---|---|
Matter | Anything that has mass and takes up space. |
Mass | Describes the amount of matter in an object. |
Weight | A measure of the gravitational force on an object. |
Volume | The amount of space that an object takes up. |
Density | A measure of the of mass in a given volume. |
Physical Property | A characteristic of a substance that can be observed and measured without changing the identity of the substance. |
Chemical Property | Describes a substances ability to change into a new substance with different properties. |
Physical Change | A change that affects one or more physical properties of a substance. |
Chemical Change | Occurs when one or more substances change into entirely new substances with different properties. |
Law of conservation of mass | States that an ordinary chemical and physical changes. |
Atom | The smallest unit of an element that maintains the properties of that element. |
Element | Made up of one or more of the same kind of atom chemically combined. |
Compound | Made up of different kinds of atoms chemically combined. |
Mixture | Contains a variety of elements and compounds that are not chemically combined with each other. |
Pure Substance | Elements and Compounds. |
Hetrogeneous | A heterogeneous mixture is one that does not have a uniform composition. |
Homogeneous | Describes something that has a uniform structure or composition throughout. |
Solid | A substance has a definite volume and shape. |
Liquid | A substance has a definite volume but not a definite shape. |
Gas | Does not have a definite volume or shape. |
Feezing | The change in state in which a liquid becomes a solid. |
Melting | The change of state from a solid to a liquid. |
Evaporation | When some particles gain enough energy that they escape from the surface of the liquid and become a gas. |
Boiling | A rapid change from a liquid to a gas, or vapor. |
Condension | The change of state form a gas to a liquid. |
Sublimation | The change from a solid state directly into a gas. |
Depositioin | The change in state from a gas directly to a solid. |