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Unit 2
| Question | Answer |
|---|---|
| matter | anything that takes up space and has mass |
| what are elements made of | only 1 kind of atom ex: hydrogen, zinc |
| what are compounds made of | More than one kind of atom ex: H2O, NaCl |
| what are mixtures made of | individual components ex: H2O + NaCl |
| can elements be broken down | no |
| can compounds be broken down | yes, by chemical means |
| can mixtures be broken down | yes, by physical means |
| are elements pure substances | yes |
| are compounds pure susbtances | yes |
| are mixtures pure substances | no |
| are elements chemically combined | no |
| are compounds chemically combined | yes |
| are mixtures chemically combined | no |
| homogenous mixture | A mixture that appears to be the same throughout, hard to separate |
| heterogeneous mixture | A mixture that does not appear to be the same throughout, easy to separate |
| physical property | can be observed without changing the identity |
| what type of property is melting pt, density, temperature, and mass? | physical property |
| chemical property | can only be observed as two substances are mixed together. |
| what type of property is pH, combustibility, reaction with water, corrosion, and flammability? | chemical property |
| extensive property | A property that may not be useful in identifying a substance and may depend on how much of a particular sample there is. |
| volume, weight, mass, and length are intensive or extensive? | extensive |
| Intensive property | A property that does not depend on the size of the sample and is used to identify a substance. |
| color, odor, melting point, density, temperature, and hardness are intensive or extensive? | intensive |
| physical change | change only to physical properties and does not change the identity of the substance |
| crushing, dissolving, and melting are signs of physical or chemical changes? | physical |
| chemical changes | produce new substances that are different from the original substance. |
| signs of chemical change | precipitate or gas produced |
| burning, cooking, digestion, rusting are signs of physical or chemical changes? | chemical |
| sublimation | solid to a gas |
| deposition | gas to a solid |
| intermolecular forces | attractive forces between atoms or molecules |
| Intermolecular forces are (stronger/weaker) when particles are closer together. | stronger |
| critical point | point where you can't distinguish liquid from gas on phase diagram |
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kayla57575
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