4193366
Flashcards by Jade Dickey, updated more than 1 year ago
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Created by Jade Dickey
over 5 years ago
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Description
| Question | Answer |
| Physical Properties | Help to identify a substance Are readily observable Color, hardness, density, boiling point, change of state etc. |
| Thermal Conductivity | the rate at which a substance transfers heat – Good conductor: metal – Poor conductor: Styrofoam |
| State | the physical form in which a substance exists. (solid, liquid, gas or plasma) |
| Solubility | the ability of a substance to dissolve in another substance. (ex. Flavored drink mix in water) |
| Ductility | the ability of a substance to be pulled into a wire |
| Malleability | the ability of a substance to be rolled or pounded into thin sheets |
| Physical Change | Cause changes to physical properties Physical properties will change but the substance or type of matter will remain the SAME! DO NOT result in the formation of a new substance |
| Examples of Physical Change | If you melt a block of ice, you still have H2O in the end. If you break a bottle you still have glass. Painting a piece of wood will not make it not be wood. Melting, freezing, breaking, condensing, crushing, cutting and bending |
| Chemical Properties | Describe matters ability to change into new matter. Can only be observed if the type of matter is changed |
| Characteristic Property | A property that is always the same no matter the size of the sample. These can be used to identify and classify a substance. – Examples: density and magnetism   |
| Chemical Property Examples | Flammability: – will the object burn? Reactivity – Will to substances react to form a new substance? |
| Difference between physical and chemical properties? | We can observe physical properties without changing the substance. We cannot observe a chemical property without changing the matter involved. |
| Chemical Change | A change that matter undergoes when it turns into a NEW substance – elements of the original substance are broken apart and rearranged to form a NEW substance Chemical Changes ALWAYS result in the formation of a NEW substance with different properties than the original substance(s). Chemical Changes are difficult to reverse (think of trying to unbake a cake) |
| Common Examples of Chemical Change | • Burning a log causes a chemical reaction that releases carbon dioxide • Placing an alka-seltza in water releases carbon dioxide bubbles • Exposing some metals to water and oxygen causes the formation of rust • Other processes that include chemical reaction: • Digestion • Respiration • Photosynthesis • Decomposition |
| Signs that a chemical change has occurred | Change in color Change in odor Production of heat Fizzing Foaming Sound or light being given off |