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Elements & Compounds
7th Grade Unit 1
| Term | Definition |
|---|---|
| Matter | anything that has mass and takes up space, or has volume |
| Solid | a state of matter that has a fixed shape, volume, and mass |
| Liquid | a state of matter that has a definite volume but no fixed shape, and takes the shape of its container |
| Gas | a substance that has no fixed shape or volume |
| Fluid | substance that does not possess a definite shape and easily yields to external pressure |
| Elements | a substance that is made up of only one type of atom, and cannot be broken down into a simpler substance |
| Chemical Symbol | a one- or two-letter abbreviation used to represent a chemical element |
| Periodic Table | the organized array of all the chemical elements in order of increasing atomic number |
| Atomic Number | the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table. |
| Atomic Mass | the mass of an atom, which is the sum of the masses of its protons, neutrons, and electrons |
| Compounds | a pure substance that's made up of two or more different elements that are chemically joined together. |
| Chemical Reaction | a process that transforms one or more substances, called reactants, into different substances, called products |
| Chemical Formula | tells us the number of atoms of each element in a compound. |
| Molecules | a group of two or more atoms that can be divided into a pure substance while still retaining the substance's chemical properties and composition |
Created by:
klstorie
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