Questions to review for Unit 5 test
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| The substance doing the dissolving is called what? | solvent
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| Water molecules are attracted to each other because they are what? | polar
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| T or F Salt dissolved much better in hot water than cold. | F
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| T or F Since different substances are made from different atoms, ions, or molecules, increased temperature affects the extent to which they dissolve. | T
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| T or F Water cannot dissolve many ionically bonded substances. | F
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| A cold pack dissolving is an example of what kind of reaction? | endothermic
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| Which has greater surface tension, water or alcohol? | water
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| Sugar dissolves better in this temperature of water because increased molecule motion helps break the attractions easier. | hot
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| The chemical formula for sucrose, C12H22O11, means there are how many atoms of oxygen? | 11
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| T or F Since different liquids combine differently, we know that solubility is not a characteristic property of liquids. | F
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| T or F Liquids cannot dissolve other liquids. | F
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| The amount of gas that dissolves in water depends on the temperature of what? | water
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| T or F For a liquid to dissolve in a solid, the molecules of the liquid and solid must attract one another. | T
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| The substance being dissolved is the what? | solute
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| When a neutral molecule has both positive and negative areas, it is said to be what? | polar
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| With salt, these are pulled apart when dissolved in water. | ions
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| T or F Because salt is ionic, the polarity of the water allows opposite positive/negative areas of salt and water to attract. | T
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| In an exothermic reaction, which way does the temperature go? | up
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| Which dissolves better in water, salt or sugar? | sugar
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| Since a water molecule has the same number of protons and electrons, it is said to be ________________. | neutral
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| When water and alcohol combine, they seem to do what? | shake
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| In an endothermic reaction, which way does the temperature go? | down
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| T or F Diffferent substances have different solubilities because substances are chemically different and interact differently with water. | T
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| T or F The attraction of molecules at the surace is called surface attraction. | F
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| Water did not soak into the wax paper because wax paper is _______________. | nonpolar
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| Which liquid did not dissolve the M & M at all? | mineral oil
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| T or F Less molecular motion makes molecules come apart easier? | F
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| As temperature increases which is more soluble in water, sugar or CO2? | sugar
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| T or F Gases can dissolve in water. | T
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| Because a power plant can return the water it has used to a lake, the water must be cooled because if not the water lacks something that makes it hard for the fish to survive. What does it lack? | oxygen
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