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Review - Prop&Ch Mat
| Question | Answer |
|---|---|
| Signs of a chemcial change: | gas is released (bubbles) heat is produced (unexpected temperature change) precipitate is formed (two liquids combine to form a solid) unexpected color change |
| In a density column | the LEAST dense is at the TOP the MOST dense is at the BOTTOM |
| Water has a density of | 1 g/cm3 |
| If a substance has a density LESS than 1 g/cm3 | it will FLOAT on water |
| If a substance has a density GREATER than 1g/cm3 | it will SINK below water |
| homogenous mixture | *NOT a pure substance *All solutions (anything dissolved in a liquid) *difficult to see its parts *difficult to separate |
| Two or more atoms bonded together | Molecules |
| Pure Substance | is made of (composed) only one type of particle (atom or molecule) through out |
| Type of elements on the periodic table that are brittle, semiconductors, and also shiny | metalloids |
| Metalloids | located on the stairstep, zig-zag, or between the metals and nonmetals on the periodic table Has physical properties of both metals and nonmetals |
| Si - Silicon | An example of a metalloid |
| When a substance changes from a liquid to a gas | the kinetic energy of the particles increases (speeds up) |
| Particles are close together and move around and past each other | liquid |
| Examples of Pure Substances | Elements (on the PT) iron, gold, silver, oxygen, silicon Compounds (not on the PT) water (H20) salt (NaCl) |
| A kind of element on the periodic table that are brittle, poor conductors, and have a dull luster | nonmetals |
| Nonmetals | located on the right side of the periodic table |
| A mixture in which the particles can be seen easily and it can be separated easily | hetereogenous mixture |
| Elements that are good conductors of electriclity and heat and are located on the left side of the periodic table | metals |
| When two liquids combine to form a solid (can simply be a chunky substance) ...and there is a color change as well. | a precipitate forms |
| If a precipitate forms there has been a chemical change | true |
| Salt is a | pure substance |
| An example of a heterogeneous mixture is | sugar and cinnamon salt and pepper trail mix |
| Mixture in which the parts are easily seen and can be separated easily (ex. picking out the tomatoes from a salad) | heterogeneous mixture |
Created by:
jschroeder4