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atoms and molecules
| Term | Definition |
|---|---|
| atom | the smallest unit of element that maintains the properties of that element. |
| element | a substance that can not be separated or broken down into simpler substances by chemical mean. |
| nucleus | in physical science,an atom central region ,witch is made up of protons and neutrons. |
| proton | a subatomic particle that has a positive charge and that is found in the nucleus of an atom . |
| neutron | a subatomic particle that has no charge and that is found in the nucleus of a atom. |
| electron | a subatomic particle that has a negative charge |
| atomic number | the number of protons in the nucleus of a atom |
| chemical symbol | a one or a two letter code that represents an element |
| neutral | having no over charge |
| atomic mass | the mass of a atom expressed in atomic mass units |
| pure substance | a sample of matter either a single element or a single compound that has definite chemical and physical change |
| compound | a substance made up of atoms of two or more different elements joined be chemical bond |
| molecule | the smallest unit of a substance that keeps all of the chemical and physical properties of that substance |
| chemical formula | a combination of chemicals symbols and numbers to represents a substance |
| subscript | a small number written to the right and slightly below a chemical symbol to tell the number of atoms of that element in the substance. |
| mixture | the combination of two or more substances that are not chemically combined |
| state of matter | the physical forms of matter ,witch includes solids, liquids, and gas |
| solid | the state of matter in witch the volume and shape of a substance are fixed |
| gas | a form of matter that does not have definite volume or shape |
| melting point | temperature in witch a solid to changes to a liquid |
| vaporization | process in witch a liquid changes in a gas |
| boiling point | the temperature at witch a liquid vaporized and changes into a gas |
| condensation | the change from a gas to a liquid |
| freezing point | temperature at which a liquid changes into a solid |
| sublimation | the process in which a solid changes directly into gas |
| phase change diagram | drawing that shows the relationship among |
| plasma | a state of matter that forms when temperature are enough to completely re move electrons from the atoms to which they were bound |
| physical property | a substance that does not involve a chemical such as density,color,and hardness |
| density | the ratio of the mass of a substance to the volume of the substance |
| chemical property | a property of matter that describes a substance ability to participate in chemical reaction |
| physica change | a change of matter from one from to anouther without a charge in chemical properties |
| chemical change | a change |
| chemical reaction | |
| precipitate | |
| combustion reaction |
Created by:
25kaismi
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