August 2016  Chemistry Regents #26-30

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26 Which compound is an electrolyte?

(1) H2O (3) H3PO4

(2) C2H6 (4) CH3OH

3    

27 When the hydronium ion concentration of an aqueous solution is increased by a factor of 10, the pH value of the solution

(1) decreases by 1     (3) decreases by 10

(2) increases by 1      (4) increases by 10

1    

28 The stability of isotopes is related to the ratio of which particles in the atoms?

(1) electrons and protons

(2) electrons and positrons

(3) neutrons and protons

(4) neutrons and positrons

3    

 

29 Which radioisotope has the fastest rate of decay?

(1) 14C (3) 53Fe

(2) 37Ca (4) 42K

2    

30 The atomic mass of an element is the weighted average of the atomic masses of

(1) the least abundant isotopes of the element

(2) the naturally occurring isotopes of the element

(3) the artificially produced isotopes of the element

(4) the natural and artificial isotopes of the element

2    

 

Questions 1-5 Questions 6-10 Questions 11-15 Questions 16-20 Questions 21-25 Questions 26-30 Questions 31-35 Questions 36-40 Questions 41-45 Questions 46-50

Questions 51-54 Questions 55-57 Questions 58-59 Questions 60-61 Questions 62-65 Questions 66-68 Questions 69-72 Questions 73-74  Questions 75-76  Questions 77-78  Questions 79-80  Questions 81-82  Questions 83-85

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