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5th Chap 1B
classification of matter
Question | Answer |
---|---|
element | a substance that cannot be broken down into other substances by heat, light or electricity |
periodic table | a chart that classifies elements by their properties |
nucleus | the center of an atom, where protons and neutrons are located |
proton | particle in an atom that has a positive electrical charge |
neutron | particle in an atom that has no charge |
electron | particle in an atom that has a negative electrical charge |
molecule | two or more atoms joined together the smallest unit of many substances |
compound | a substance made up of atoms of more than one element joined together in a molecule |
mixture | 2 or more substances that are mixed together, but can be separated out because their atoms are not combined |
solution | a mixture in which substances break up into their most basic particles, which are too small to be seen, and spread evenly through antoher substance |
physical properties | a way o f describing an object using traits that can be observed or measured without changing the substance into something else |
physical change | a change in one or more physical properties |
chemical property | describes the way a substance reacts with other substances |
chemical change | a change that produces new substances with new properties |
chemical reaction | a process that produces one or more substances that are different from the original substances |