January 2017 Chemistry Regents #36-40

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Question 51-53 Questions 54-55
 Questions 56-57 Questions 58-59 Questions 60-61 Questions 62-65  Questions 66-68  Questions 69-72  Questions 73-77 Questions 78-79 Questions 80-82 Questions 83-85
 

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36 Given the balanced equation representing a reaction:

Which mass of oxygen completely reacts with 4.0 grams of hydrogen to produce 36.0 grams of water?

(1) 8.0 g      (3) 32.0 g

(2) 16.0 g    (4) 40.0 g

3   36.0g=  X g  +4.0g
37 What is the gram-formula mass of Ca(OH)2?

(1) 29 g/mol (3) 57 g/mol

(2) 54 g/mol (4) 74 g/mol

4   40+ 2(16+1)=74
38 Given the equation representing a reaction:

Which statement describes the energy changes that occur in this reaction?

(1) Energy is absorbed as bonds are formed, only.

(2) Energy is released as bonds are broken, only.

(3) Energy is absorbed as bonds are formed, and energy is released as bonds are broken.

(4) Energy is absorbed as bonds are broken, and energy is released as bonds are formed.

4   Breaking bonds absorbs

forming bonds releases

 

 

39 Based on Table F, which compound is least soluble in water?

(1) AlPO4 (3) Ca(OH)2

(2) Li2SO4 (4) AgC2H3O2

1   Phosphates are insoluble
40 How many joules of heat are absorbed to raise the temperature of 435 grams of water at 1 atm from 25C to its boiling point, 100.C? (1) 4.5 X 104 J (3) 2.5 x 107 J (2) 1.4 x 105 J (4) 7.4 x 107 J 2   Q=m Hv= 435g x 2260J/g= 2,500,000J

2.5 x 107 J

 

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

Question 51-53 Questions 54-55
 Questions 56-57 Questions 58-59 Questions 60-61 Questions 62-65  Questions 66-68  Questions 69-72  Questions 73-77 Questions 78-79 Questions 80-82 Questions 83-85
 

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