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Science savannah
test tomorrow !!!
| Question | Answer |
|---|---|
| Physical Property | Any characteristic of material, such as size or shape without changing composition. |
| Viscosity | Funds resistance to flow Ex. Honey |
| Conductivity | The ability to allow heat to flow |
| Malleability | Ability of a solid to be hammered without shattering |
| Melting Point | Temp at which a solid becomes a liquid |
| Boiling Point | Temp at which substance changes from liquid to a gas! |
| Filitration | Act of passing a substance such as water through a filter to remove solid particles from it. |
| Distillation | Process that can separates two substances in a mixture by evaporating a liquid and re condescending its vapor. |
| Physical Change | Any change in size, shape,or state of matter in which the identity of the substance remains the same. |
| Chemical Property | Any property that produces a change in composition of matter. |
| Flammability | Quality of being easily ignited and burning rapidly. |
| Re-activity | Measure of how actively a substance of chemical reacts with other substance or chemical. |
| Chemical Change | Change of one substance to another |
| Precipitate | Insoluble compound that comes out of solution during a double displacement reaction |
| Explain how Physical Properties can be used to separate mixtures | Separate items based on appearance (magnetism) |
| 5 examples of physical changes | Size Shape Density State of matter and color |
| Explain how distillation uses a physical change to separate a mixture | Uses PC making a liquid to a solid to separate mixtures. One substance with lower boiling point first leaves behind gas mixture is separated |
| When can chemical properties be observed? | Only when substance is changing into another substance |
| 3 types of evidence for a chemical change and give example for each | Change in color Ex. Burning wood Production of gas Ex. Baking soda Formation of Precipitate Ex. Veneger and milk |
| Difference between chemical and physical change | Chemical- Composition changes and leaves new substance Physical- composition remains the same |
| Steps that can be used to identify a material | 1. Decide which properties to test 2. Do test on sample of unknown 3. Compare results data reported of known materials. |
| Two processes that are commonly used to separate mixtures are? | Filtration and Distillation |
| Explain how filtration separates materials based on the size of their particles | Particles small enough to pass through filter are separated from larger particles that are trapped on filter |
| Explain why distillation works for converting seawater into fresh water. | Water has a much lower boiling point than the compound disolved in sea water. Water can be boiled and collected in original container |
| What physical change processes are reversible? | Wrinkling a shirt and freezing water |
| What compounds form when a candle burns? | Water and Carbon |
| Why isn't iron used to make coins? | it is highly reactive in presence of oxygen and water and it would rust |
| What happens to the composition when matter undergoes chemical change? | Changes |
| What happens to the composition when matter undergoes a physical change? | stays the same |
Created by:
savannahsimpson
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