Term
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Definition
| a bond in which atoms share electrons |
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Term
| What is a polar molecule? |
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Definition
| a molecule in which there is a partial positive side (hydrogen) and a partial negative side (oxygen) |
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Term
| What atoms make up the water molecule? |
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Definition
| two hydrogen atoms and one oxygen atom |
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Term
| Why is water a polar molecule? |
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Definition
| there is an unequal sharing of electrons (the oxygen attracts the electrons more strongly than the hydrogen) |
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Term
| Because water is polar, what do you know about the charges of the water molecule? |
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Definition
| oxygen is slightly negative and hydrogen's are slightly positive |
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Term
| Why are lipids like oil non-polar? |
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Definition
| equal sharing of electrons in the molecule |
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Term
| What causes surface tension? |
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Definition
| cohesion – attraction between water molecules |
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Term
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Definition
| decreases in density (an increase in volume) |
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Term
| What is the most common solvent? |
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Definition
| water – it can dissolve most polar and ionic compounds |
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Term
| What property of water is responsible for the meniscus of a graduated cylinder? |
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Definition
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Term
| Why do the following have in common: adhesion, cohesion, capillarity? |
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Definition
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Term
| How does adding oil to the top of water make it boil faster? |
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Definition
| 1. the molecules with the highest kinetic energy (the hottest molecules) are those that are released from the surface of water as it’s heated. The oil acts as an insulator, keeping that energy in the liquid raising the temperature more quickly. |
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