Chem 106 Comp Exam 3 PRACTICE
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1. |
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Two liquids that are insoluble in each other are considered |
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immiscible |
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miscible |
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unsaturated |
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isotonic |
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2. |
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Which of the following statements relating to a solution is NOT correct? |
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A solution may contain more than one solute. |
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A solution may contain only one solute. |
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Water is always the solvent in a solution. |
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More than one correct response is given. |
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3. |
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What is the molarity of a solution containing 0.612 moles of solute in 250 mL of solution? |
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2.45 x 10-3 |
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0.408 |
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2.45 |
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408 |
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4. |
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Calculate the molar concentration of a solution made by dissolving 8.60 grams of KCl in enough water to give 100 mL of solution. |
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0.860 M |
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1.15 M |
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0.115 M |
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5.45 M |
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5. |
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A solution is made by dissolving 300 mL of oil in enough gasoline to give 9.00 L of solution. What is the % (v/v) of oil in the solution? |
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333% |
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33.3 % |
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3.33 % |
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0.333% |
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6. |
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What is the volume of ethyl alcohol contained in 35 mL (1 oz) of 86 proof liquor, which is 43% (v/v) alcohol? |
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30 mL |
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43 mL |
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15 mL |
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37 mL |
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7. |
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Calculate the number of moles of BaCl2 in 200 mL of 0.625 M solution. |
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3.13 |
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1.92 |
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0.819 |
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0.125 |
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8. |
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An ethylene glycol and water solution does not conduct electricity. In water, ethylene glycol would be found as |
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ethylene glycol molecules |
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ethylene glycolate ions |
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ethylene ions and glycolate ions |
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no correct response |
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9. |
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Which of the following is NOT a colligative property? |
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boiling point changes |
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Tyndall effect |
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osmotic pressure |
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no correct response |
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10. |
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Which of the following would exhibit the highest vapor pressure at 25oC? |
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pure water |
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a 5% saltwater solution |
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a 10% saltwater solution |
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they would all have the same vapor pressure |
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11. |
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The dispersed phase of a colloid can be a |
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gas |
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liquid |
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solid |
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more than one choice is correct |
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12. |
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To keep particles in some colloids from coalescing, you would use a(n) |
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anticoagulant |
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dispersing medium |
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emulsifying agent |
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solvent |
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13. |
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Ice has an entropy ________ that of liquid water. |
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lower than |
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equal to |
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higher than |
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cannot tell |
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14. |
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A process that gains or accepts energy as it takes place is a(n) |
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exergonic process |
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spontaneous process |
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endergonic process |
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all of these |
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15. |
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An explanation of how a molecule changes shape as a reaction proceeds would be called a(n) |
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endergonic reaction |
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reaction mechanism |
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reaction rate |
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activation energy |
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16. |
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A reaction that has a large activation energy is |
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likely to occur if the reaction is exothermic |
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likely to occur if the reaction is endothermic |
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unlikely to occur |
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more than one choice is correct |
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17. |
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In a coal-fired power plant, the coal is pulverized into a powder prior to combustion to increase the combustion rate. By doing this, the ________ is changed |
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concentration of the reactants |
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temperature of the reactants |
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nature of the reactants |
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activation energy |
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18. |
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A + B = C The reaction above occurs in a water solution. As time goes along, “A” and “B” are used up to produce “C”, which is insoluble in water and settles to the bottom of the container. As time goes along, the reaction rate will |
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increase |
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decrease |
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remain the same |
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19. |
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A reaction is endothermic, but proceeds very slowly. A catalyst is added to increase the reaction rate. After adding the catalyst, the reaction will be |
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endothermic |
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exothermic |
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cannot be determined with the information given |
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20. |
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A + B = C When the reaction above is at equilibrium |
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new molecules of “A” are being formed |
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new molecules of “C” are being formed |
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both choices are correct |
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none of the above is correct |
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21. |
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An equilibrium exists where there are more products present than reactants. This equilibrium is said to |
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have a position to the right |
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have a position to the left |
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be stressed |
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be in a state of transition |
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22. |
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A + B = C + D The reaction above is at equilibrium. What will happen if some “D” is added to the reaction vessel? |
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the concentration of “C” will increase |
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the concentration of “B” will decrease |
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the concentration of “A” and “B” will remain the same |
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the concentration of “A” will increase |
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23. |
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An equilibrium is established in the reaction above. What change would be observed in the appearance of the equilibrium mixture if a catalyst was added? |
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no change would be seen |
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the violet color of the mixture would become lighter |
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the violet color of the mixture would become darker |
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no correct response |
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24. |
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2HBr = H2 + Br2 What will happen to the equilibrium above if H2 is added to the reaction vessel? |
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no change will occur |
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the equilibrium will shift right |
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the equilibrium will shift left |
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25. |
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Which of the following is an Arrhenius base? |
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Al(OH)3 |
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Ca(OH)2 |
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KOH |
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more than one choice is correct |
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26. |
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A Brřnsted base is a(n) |
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proton donor |
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proton acceptor |
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OH- donor |
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OH- acceptor |
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27. |
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HIO3 + H2O = H3O+ + IO3- Identify ALL Bronsted acids in the reaction above. Note that it is reversible. |
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HIO3 |
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HIO3 and H3O+ |
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H2O |
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H2O and HIO3 |
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28. |
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The self-ionization of water produces OH- and |
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H2O |
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OH+ |
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H3O- |
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H3O+ |
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29. |
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You drink a liter of pure, neutral pH water. You have just consumed |
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10-7 moles OH- ions |
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10-7 moles H3O+ ions |
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only H2O molecules |
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more than one choice is correct |
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30. |
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A higher pH corresponds to |
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a higher [H+] |
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a lower [H+] |
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no change in [H+] |
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a lower [OH-] |
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31. |
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The molar concentration of H+ ions in a solution is 5.8 x 10-9. The pH is |
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9.00 |
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5.80 |
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between 8.00 and 9.00 |
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between 9.00 and 10.00 |
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32. |
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What would one of the products be if CuO reacted with HCl? |
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H2O |
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CuCl2 |
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both of the above are correct |
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no correct response |
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33. |
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2Na(s) + H2SO4(aq) = Na2SO4(aq) + H2(g) Write the reaction above in total ionic form and identify the spectator ion(s). The dissolved substances (designed by aq) are the only ones that dissociate completely into ions. |
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Na+ |
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H+ |
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SO42- |
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more than one choice is correct |
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34. |
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which of the following is NOT a characteristic of a solution? |
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the solvent can be a solid,liquid, or gas |
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the solute can be a solid, liquid, or gas |
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the mixture is heterogeneous |
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no correct response |
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35. |
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Which of the following decreases as the temperature of a water solution increases? |
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the solubility of a gas |
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the solubility of a solid |
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the saturation point of a solid |
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no correct response |
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36. |
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How many mL of a 6.00 M NaBr solution would have to be diluted with water to produce 500 mL of 0.500 M solution? |
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83.5 |
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41.7 |
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30.1 |
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no correct response |
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37. |
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How many grams of KCl are needed to prepare 250 mL of 0.470 M solution? |
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18.6 |
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62.6 |
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31.2 |
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8.76 |
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38. |
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A salt water solution boils at 102oC. What will happen if more salt is added to the solution? |
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the osmotic pressure will decrease |
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the boiling point will decrease |
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the freezing point will decrease |
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no correct response |
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39. |
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which of the following can pass through a dialysizing membrane? |
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solvent molecules |
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colloid particles |
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small molecules |
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more than one choice is correct |
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40. |
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A + B = C + D + Heat |
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the concentration of D would increase |
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the concentration of D would decrease |
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the concentration of B would decrease |
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no correct response |
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41. |
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HNO3 + H2O = H3O+ + NO3- |
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HNO3 |
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H2O |
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H3O+ |
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more than one choice is correct |
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42. |
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2H2O = H3O+ + OH- |
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increase the OH- concentration |
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decrease the OH- concentration |
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decrease the H2O concentration |
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no correct response |
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43. |
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If the pH of a solution is 9, what is the concentration of OH- ions? |
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1 x 10-9 mole/L |
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1 x 109 mole/L |
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1 x 105 mole/L |
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1 x 10-5 mole/L |
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44. |
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What products are produced when HCl reacts with NaOH? |
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salt |
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H2O |
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carbon dioxide gas |
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more than one choice is correct |
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45. |
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What is the likely source of the cation in Ca(NO3)2 salt which is produced by a neutralization reaction? |
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Ca(OH)2 |
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CaCO3 |
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HNO3 |
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more than one choice is correct |
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46. |
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H2CO3 is an example of a _____ acid. |
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weak, diprotic |
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weak, monoprotic |
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strong, diprotic |
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strong, monoprotic |
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47. |
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A buffer solution has a pH of 8.6. A little acid is added to this solution. What is the probable pH of the new solution? |
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1.0 |
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5.6 |
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7.0 |
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8.6 |
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48. |
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Which of the following are made up of particles identical to electrons? |
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alpha rays |
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beta rays |
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gamma rays |
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more than one response is correct |
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49. |
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Radioactive decay is a process in which an unstable ________ changes energy states and emits radiation. |
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electron |
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proton |
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nucleus |
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neutron |
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50. |
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23793 Np is an alpha emitter. What is the element produced by the decay of Np-237? |
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U |
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Pa |
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Th |
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Pu |
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51. |
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4623V = ? + 4622Ti What particle would complete the nuclear equation above? |
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alpha particle |
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beta particle |
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gamma ray |
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positron |
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52. |
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Sodium–24 has a half-life of 15.0 hours. Suppose you had a sample containing 0.010 moles of Na-24. How many hours would be required to reduce your sample to 6.25 x 10-4 moles? |
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120 |
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60 |
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45 |
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30 |
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53. |
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When high energy radiation knocks an electron out of an atom that it strikes, a _______ is formed. |
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free radical |
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daughter nucleus |
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radioisotope |
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fission reaction |
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54. |
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Iodine-123 can be used as a tracer specific for the thyroid gland. If a thyroid is NOT overactive, a ________ will form when I-123 is administered. |
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free radical |
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mutation |
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“cold spot” |
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“hot spot” |
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55. |
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Which of the following is NOT a particle released during radioactive decay? |
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alpha |
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beta |
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gamma |
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positron |
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56. |
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Lead-214 (Pb-214) undergoes radioactivce decay through beta emission. What nucleus is produced from Pb-214? |
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214/83 Bi |
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214/81 Ti |
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215/82 Pb |
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No correct response |
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57. |
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After 60 minutes, a 10.0 g sample of Pb-194 is found to have only 1/16 the amount of radioactivity as it originally had. What is the half-life of Pb-194? |
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45 minutes |
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30 minutes |
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15 minutes |
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10 minutes |
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58. |
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A gamma-ray emitting radioisotope used for medical purposes would be best suited for use as a |
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Diagnostic tracer |
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Therapeutic isotope |
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Metabolic inhibitor |
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No correct response |
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Answers:
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