August 2002 Chemistry Regents #31-40

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Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

 

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Answer Explanations
31 Compared to the nonmetals in Period 2, the metals in Period 2 generally have larger
(1) ionization energies
(2) electronegativities
(3) atomic radii
(4) atomic numbers
3 Table S, look them up
32 Which of the following Group 2 elements has the lowest first ionization energy?
(1) Be       (3) Ca
(2) Mg      (4) Ba
4 Table S, look them up
33 The table below shows the normal boiling point of four compounds.


Which compound has the strongest intermolecular
forces?
(1) HF(l)         (3) CH3F(l)
(2) CH3Cl(l)   (4) HCl(l)

1 Strongest IMF, highest BP, also H-bonding
34 According to Table I, which salt releases energy as it dissolves?
(1) KNO3      (3) NH4NO3
(2) LiBr          (4) NaCl
2 exo, DH is negative
35 During a laboratory activity, a student combined two solutions. In the laboratory report, the student wrote ďA yellow color appeared.Ē The
statement represents the studentís recorded
(1) conclusion     (3) hypothesis
(2) observation    (4) inference
2 observation, I refuse to explain this
36 How many moles of solute are contained in 200 milliliters of a 1 M solution?
(1) 1      (3) 0.8
(2) 0.2   (4) 200
2 M=mol/L   200mL=0.200L
37 Increasing the temperature increases the rate of a reaction by
(1) lowering the activation energy
(2) increasing the activation energy
(3) lowering the frequency of effective collisions between reacting molecules
(4) increasing the frequency of effective collisions between reacting molecules
4 reactions= effective collisions
38 Given the equilibrium reaction in a closed system:
H2(g) + I2(g) + heat-->2 HI(g)
What will be the result of an increase in temperature?
(1) The equilibrium will shift to the left and [H2] will increase.
(2) The equilibrium will shift to the left and [H2] will decrease.
(3) The equilibrium will shift to the right and [HI] will increase.
(4) The equilibrium will shift to the right and [HI] will decrease.
3 shifts right, HI will increase
39 Which sample has the lowest entropy?
(1) 1 mole of KNO3(l)   (3) 1 mole of H2O(l)
(2) 1 mole of KNO3(s)  (4) 1 mole of H2O(g)
2 Solids lowest gases highest
40 Which of the following compounds is least soluble
in water?
(1) copper (II) chloride
(2) aluminum acetate
(3) iron (III) hydroxide
(4) potassium sulfate
3 Table F, Insoluble=least soluble

Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50
 
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