June 2015 Chemistry Regents #21-25

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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 51-53 Questions 54-56 Questions 57-59 Questions 60-62 Questions 63-65 Questions 66-69 Questions 70-73 Questions 74-76  Questions 77-79  Questions 80-82  Questions 83-85 

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Explanations

21 Which formula can represent an alkyne?

(1) C2H4      (3) C3H4

(2) C2H6      (4) C3H6

3 CnH2n-2

table Q

2 same formula different structure

 

#4 is the same structure

 

23 Which energy conversion occurs in an operating voltaic cell?

(1) chemical energy to electrical energy

(2) chemical energy to nuclear energy

(3) electrical energy to chemical energy

(4) electrical energy to nuclear energy

1 voltaic is spontaneous

chemical to electrical

 

24 Which process requires energy to decompose a substance?

(1) electrolysis      (3) sublimation

(2) neutralization   (4) synthesis

 

1linkcompounds decompose to elements

 

with electricity

25 The concentration of which ion is increased when LiOH is dissolved in water?

(1) hydroxide ion (3) hydronium ion

(2) hydrogen ion (4) halide ion

 		1 LiOH is a base

hydroxide ion is OH-

 

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 51-53 Questions 54-56 Questions 57-59 Questions 60-62 Questions 63-65 Questions 66-69 Questions 70-73 Questions 74-76  Questions 77-79  Questions 80-82  Questions 83-85 

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