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phy &chem change3
physical and chemical changes
| Question | Answer |
|---|---|
| a change that occurs without changing the identity of the substance | physical change |
| a change that occurs by changing the identity of the substance | chemical change |
| when two or more substance are combined physically | mixture |
| when two or more substances are combined chemically and cant be separated by physical. | compound |
| parts are mixed evenly throughout (same) | Homogeneous mixture |
| parts are uneven throughout (different) | heterogeneous mixture |
| type of mixture where the solution is dissolved/mixed evenly in the solvent | solution |
| the part of the solution that dissolves | solute |
| the part of the solution that the solute dissolves in | solvent |
| smallest unit of matter | atom |
| one of the 100 or more units that make up all matter, and found on the periodic table. | element |
| how much matter is in some thing | mass |
| the elements an compounds you start with in a reaction/equation | reactant |
| the elements and compound that you end with in a reaction/equation | products |
| the ability to react with another element or compound | reactivity |
| the number in front of the molecule | coefficients |
| the number of the bottom right of an element that tells how many atoms there are of the eelemts | subscript |
| group 1 a highly reactivate groups of metals that makes compounds with group 7 | Alkali metals |
| group 7 a highly reactive group of non-metals that makes compound with group 1 | halogens |
| group 8 a group of non-reactive, non metals that are all gases at room temperature. | noble gases |
Created by:
helen13
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