matter vocab
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33 terms
Terms | Definitions |
|---|---|
 matter | Anything that has mass and volume |
| atom | Smallest whole piece of matter |
| molecule | Two or more atoms hooked together |
| element | Substance made of only one kind of atom |
| compound | Substance made of more than one kind of atom combined |
| Nucleus | Center of the atom |
| Proton | Subatomic particle in the nucleus of the atom that has a positive charge |
| Neutron | Subatomic particle in the nucleus of the atom that has no charge |
| electron | Subatomic particle that is located outside the nucleus |
| Electron | Subatomic particle that has a negative charge |
| Chemical change | A change that occurs when one or more substances are changed into entirely new substances with different properties: cannot be reversed using physical means |
| Melting | The change of state from a solid to a liquid |
| Physical change | A change that affects one or more physical properties of a substance; many are easy to undo |
| Melting point | The temperature at which a substance changes from a solid to a liquid |
| Evaporation | Vaporization that occurs at the surface of a liquid below its boiling point |
| Condensation | Change of state from a gas to a liquid |
| Vaporization | Phase change from a liquid to a gas |
| Sublimation | The change of state from a solid directly to a gas |
| Condensation point | Temperature at which a gas becomes a liquid |
| Electron | Subatomic particle that has the least mass |
| Atomic number | Number that indicates the number of protons |
| Atomic mass unit (amu) | Number that indicates the number of protons and neutrons in the nucleus of that atom |
| Isotopes | Different forms of an elements atoms |
| Ion | Form of an atom that has a charge because it has gained or lost electrons |
| Nucleus | Dense, positively charged center of an atom |
| Endothermic | Describes a physical or chemical change in which energy is absorbed |
| Exothermic | Describes a physical or chemical change in which energy is lost |
| Element | A pure substance that cannot be separated or broken down into simpler substances by physical or chemical means |
| Mixture | A combination of two or more substances that are not chemically combined |
| Solution | A mixture that appears to be a single substance but is composed of particles of two or more substances that are distributed evenly amongst each other |
| Freezing | The change of state from a liquid to a solid |
| Freezing point | The temperature at which a liquid changes into a solid |
| melting point | The temperature at which a solid changes to a liquid |
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