Mixtures Unit Review

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JPalmer
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139789
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Mixtures Unit Review
Updated:
2012-03-05 12:21:47
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mixtures solutions NYS Regents Chemistry
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Review of unit on Mixtures and Solutions for high school Regents Chemistry
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  1. What is defined as two or more substances that are combined with no set ratio?
    Mixture
  2. Can mixtures be chemically or physically separated?
    Physically
  3. What terms are included under the heading of substances?
    Elements and compounds
  4. What type of mixture is a suspension of dirt in water (muddy water)?
    Heterogenous mixture
  5. What type of mixture is an alloy?
    Homogenous mixture
  6. A student dissolves 30 g of KNO3 in 100 ml water at 25 C. What is the NAME of the solute?
    potassium nitrate
  7. A student dissolves 30 g of KNO3 in 100 ml water at 25 C. What term is used to describe this solution?
    unsaturated
  8. A student dissolves 30 g of KNO3 in 100 ml water at 25 C. How many more grams will be needed to saturate this solution?
    10 more grams
  9. Give an example of 2 miscible liquids.
    Alcohol and water Or vinegar in water
  10. What happens to an ionic solid when it dissolves in water that does not happen to a covalent molecule?
    Ionic substances dissociate or break into ions
  11. The overall energy change that occurs when a solid dissolves in water is called __________ and these values are found on ref table ___.
    The overall energy change that occurs when a solid dissolves in water is called HEAT OF SOLUTION and these values are found on ref table I.
  12. According to the Heats of Reactions reference table, when KNO3 is dissolved in water, will the temp of the water increase or decrease? Explain
    Water temp will decrease because the dissolving process in endothermic hence absorbing energy from the water.
  13. When NH4Cl dissolves in water, the chloride ion would be attracted to which end of the water molecule and why?
    The chloride ion is attracted to the positive end of the water molecule (hydrogen end) because a chloride ion has a neg charge.
  14. A saturated solution of KCl is prepared at 80 C in 200 ml of water. If the solution is cooled to 50 C, how much solid will ppt out?
    Answer: 20 g. (52 g - 42 g x 2)
  15. What general trend is true for the solubility of an ionic solid with a change in temp?
    As the temp increases, the solubility of the ionic solid increases.
  16. What is the general trend for the solubility of a gas with a change in temp?
    As the temp increases, the gas is less soluble (less dissolves)
  17. Why will CCl4 not dissolve in water?
    because water is polar and CCl4 is nonpolar
  18. What is defined as "a solution in which the rate of crystallization equals the rate at which solute dissolves"
    saturated solution (or equilibrium)
  19. According to the Solubilities Curve reference table, which 100 ml saturated solution at 30 C would be considered dilute? 95 g of NaNO3 or 12 g of KClO3
    12 g of KClO3
  20. What is the formula to calculate the percent by mass of a solution?
    % equals the mass of the solute divided by the mass of the solution times 100.
  21. When LiBr dissolves in water, the temp of the water increases. This tells us that the process is (exothermic, endothermic)
    Exothermic
  22. What is the formula used to calculate parts per million?
    ppm = grams of solute divided by grams of solvent times 1 million.
  23. If a mixture of sulfur, water and sugar are filtered, what will be in the filtrate?
    water and sugar
  24. Using filtration makes use of what physical property?
    solubility
  25. What is the best way to separate a mixture of salt and water
    Evaporation
  26. What substances are separated by distillation?
    2 or more soluble liquids
  27. To separate out the components of an alloy, the mixture is first heated to melting point. The separation is then based on what physical property?
    Density
  28. Distillation of petroleum or crude oil is also called ___
    Fractional Distillation
  29. Distillation is based on what physical property?
    Bioling point
  30. The more particles dissolved in water, the ____ the boiling point.
    higher
  31. The more particles dissolved in water, the ____ the freezing point
    Lower
  32. Which will produce more particles in solution when dissolved? KBr or CH3OH Explain
    KBr because it is ionic while alcohol is covalent
  33. What three categories of compounds form solutions which are electrolytes?
    Ionic (salts), acids, and bases.
  34. Which solution will freeze at the HIGHER temp? 1 M NaCl or 1 M C6H12O6
    1 M C6H12O6

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