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8th Unit 1b
Matter & Atoms
| Term | Definition |
|---|---|
| Atomic number | The number of protons found in the nucleus of an atom of an element |
| Atom | The smallest unit of an element that maintains the characteristics of that element |
| Boiling point | The point at which a substance changes phase from a liquid to a gas. |
| Chemical Change | When one substance combines with another to form a new substance |
| Compound | Two or more elements that are chemically combined to form a new substance |
| Density | The amount of matter per volume. Measured by dividing the mass of an object by its volume. |
| Element | A pure chemical substance consisting of one type of atom distinguished by the numberof protons contained in its nucleus |
| Gas | A state of matter that is a compressible fluid which will conform to the shape of its container but it will also expand to fill the container. |
| Law of conservation of matter | Matter is not created or destroyed it can only change its form. |
| Liquid | A fluid state of matter that can't be compressed easily, that conforms to the shape of its container, but retains a (nearly) constant volume independent of pressure. |
| Melting point | The point at which a substance changes phase from a solid to a liquid. |
| Mixtures | Two or more substances that are physically combined where the characteristics of the individual substances are retained |
| Molecules | Two or more elements that are chemically bonded together |
| Periodic table | An organized chart of chemical elements based on the number of protons contained in the nucleus of the atoms of each element |
| Physical change | Changes affecting the form of a chemical substance, but do not change the chemical composition of that substance. |
| Plasma | A high energy state of matter taking the form of gas-like clouds or ion beams |
| Precipitate | A solid that forms when a substance comes out of solution |
| Solid | A low energy state of matter that has a definite shape and a definite volume. |
| Matter | Anything that has mass and takes up space |
| Solution | A type of mixture in which one substance is dissolved into another |
| Mass | The measurement of the amount of matter that an object contains |
| Solute | The substance in a solution that is dissolved. |
| Solvent | The substance in a solution that is not dissolved. |
| Homogeneous mixture | A mixture in which the substances are evenly mixed |
| Heterogeneous mixture | A mixture in which the substances are not evenly mixed |
| Electron | The particle of atom found orbiting the nucleus that has a negative charge |
| Proton | The particle in an atoms nucleus that has a positive charge |
| Neutron | The particle in an atoms nucleus that does not have a charge |
Created by:
darrin_evans
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