June 2013 Chemistry Regents #41-50

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

Question 51-53 Questions 54-56 Questions 57-59 Questions 60-62 Questions 63-65 Questions 66-69 Questions 70-73 Questions 74-77  Questions 78-80  Questions 81-82  Questions 83-85

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41 Given the equation representing a system at equilibrium:

When the concentration of Cl-(aq) is increased, the concentration of Ag+(aq)

(1) decreases, and the amount of AgCl(s) increases

(2) decreases, and the amount of AgCl(s) decreases

(3) increases, and the amount of AgCl(s) increases

(4) increases, and the amount of AgCl(s) decreases

 
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42 Which particle diagram represents a sample of matter that can not be broken down by chemical means?

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43 Which formula represents an unsaturated hydrocarbon?

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44 When the pH of a solution is changed from 4 to 3, the hydronium ion concentration of the solution

(1) decreases by a factor of 10

(2) increases by a factor of 10

(3) decreases by a factor of 100

(4) increases by a factor of 100

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45 Three samples of the same solution are tested,  each with a different indicator. All three indicators, bromthymol blue, bromcresol green, and thymol blue, appear blue if the pH of the solution is

(1) 4.7    (2) 6.0     (3) 7.8    (4) 9.9

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46 A 10.0-milliliter sample of NaOH(aq) is neutralized by 40.0 milliliters of 0.50 M HCl. What is the molarity of the NaOH(aq)?

(1) 1.0 M      (3) 0.25 M

(2) 2.0 M      (4) 0.50 M

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47 Radiation is spontaneously emitted from hydrogen-3 nuclei, but radiation is not spontaneously emitted from hydrogen-l nuclei or hydrogen-2 nuclei. Which hydrogen nuclei are stable?

(1) nuclei of H-l and H-2, only

(2) nuclei of H-l and H-3, only

(3) nuclei of H-2 and H-3, only

(4) nuclei of H-l, H-2, and H-3

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48 Given the equation representing a nuclear reaction in which X represents a nuclide:

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49 After decaying for 48 hours, l/16 of the original mass of a radioisotope sample remains unchanged. What is the half-life of this radioisotope?

(1) 3.0 h    (3) 12 h

(2) 9.6 h     (4) 24 h

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50 Which balanced equation represents nuclear fusion?

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

Question 51-53 Questions 54-56 Questions 57-59 Questions 60-62 Questions 63-65 Questions 66-69 Questions 70-73 Questions 74-77  Questions 78-80  Questions 81-82  Questions 83-85

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