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Matter and Atoms
Ch. 1
| Question | Answer |
|---|---|
| anything that has mass and takes up space. | matter |
| a small particle that is the building block of matter. | atom |
| matter with a composition that is always the same | substance |
| a substance that consists of only one type of atom. | element |
| two or more atoms that are held together by covalent bonds and act as a unit. | molecule |
| a substance containing atoms of two or more different elements chemically bonded together. | compound |
| matter that can very in composition. | mixture |
| a mixture in which substances are not evenly mixed. | heterogeneous mixture |
| a mixture in which two or more substance are evenly mixed but not bonded together. | homogeneous mixture |
| the region in the center of an atom where most of an atoms mass and positive charge is concentrated. | nucleus |
| a positively charged particle in the nucleus of an atom. | proton |
| a neutral particle in the nucleus of an atom. | neutron |
| a negatively charged particle that occupies the space in atom outside the nucleus. | electron |
| the region surrounding an atoms nucleus where one or more electrons are most likely to be found. | electron cloud |
| the number of protons in an atom of an element. | atomic number |
| an atom of the same element that have different numbers of neutrons. | isotope |
| an atom that is no longer neutral because it has lost or gained valence electrons. | ion |
| what are solutions? examples... | a a mixture in which two or more substances are evenly mixed, but not bonded together. brass,gases,ammonia cleaner,water. |
Created by:
RiRibug
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