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Chapter 2 & 3 Vocab
Mrs. Neary's Physical Science - Chapter 2 & 3 Vocabulary Words
| Term | Definition |
|---|---|
| Matter | anything that has mass and takes up space. |
| Element | a substance that cannot be separated or broken down into simpler substances by chemical mean. |
| Atom | the smallest unit of an element that maintains the chemical properties of that element. |
| Molecule | a group of atoms that are held together by chemical forces; a molecule is the smallest unit of matter that can exist by itself and retain all of a substance's chemical properties. |
| Compound | a substance make up of atoms of two or more different elements joined by chemical bonds. |
| Pure Substance | a sample of matter, either a single element of a single compound, that has definite chemical and physical properties. |
| Mixture | a combination of two or more substances that are not chemically combined. |
| Melting Point | the temperature and pressure at which a solid becomes a liquid. |
| Boiling Point | the temperature and pressure at which a liquid becomes a gas. |
| Density | the ratio of the mass of a substance to the volume of the substance. |
| Reactivity | the capacity of a substance to combine chemically with another substance. |
| 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. |
| Fluid | a nonsolid state of matter in which the atoms or molecules are free to move past each other, as in a gas or liquid. |
| Plasma | a state of matter that consists or free-moving ions and electrons. |
| Energy | the capacity to do work. |
| Temperature | a measure of how hot (or cold) something is; specifically, a measure of the average kinetic energy of the particle in an object. |
| Thermal Energy | the total kinetic energy of a substance's atoms. |
| Evaporating | the change of state from a liquid to a gas. |
| Sublimation | the process in which a solid changes directly into a gas. |
| Condensation | the change of state from a gas to a liquid. |
| Pressure | the amount of force exerted per unit area of a surface. |
| Pascal | the SI unit of pressure; equal to the force of 1 N exerted over an area of 1 m (symbol, Pa). |
| Buoyant Force | the upward force that keeps an object immersed in or floating on a fluid. |
| Viscosity | the resistance of a gas or liquid to flow. |
| Gas Laws | the laws that state the mathematical relationships between the volume, temperature, pressure, and quantity or a gas. |
Created by:
MsScheanwald
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