January 2016 Chemistry Regents #36-40

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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

Question 51-53 Questions 54-56
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36 Which sample, when dissolved in 1.0 liter of water, produces a solution with the highest boiling point?

(1) 0.1 mole KI      (3) 0.1 mole MgCl2

(2) 0.2 mole KI      (4) 0.2 mole MgCl2

4   vant hoff factor is greater for MgCl2

(more ions in the formula)

37   Given the balanced equation representing a reaction:

4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)

What is the number of moles of H2O(g) formed when 2.0 moles of NH3(g) react completely?

(1) 6.0 mol     (3) 3.0 mol

(2) 2.0 mol     (4) 4.0 mol

3    
38  A rigid cylinder with a movable piston contains a sample of gas. At 300. K, this sample has a pressure of 240. kilopascals and a volume of 70.0 milliliters. What is the volume of this sample when the temperature is changed to 150. K and the pressure is changed to 160. kilopascals?

(1) 35.0 mL    (3) 70.0 mL

(2) 52.5 mL    (4) 105 mL

2   (240.*70.0)/300=(V * 160.)/150.

 

39 A 100.-gram sample of H2O(L) at 22.0C absorbs 8360 joules of heat. What will be the final temperature of the water?

( 1 ) 18.3Ꮯ    (3) 25.7C

(2) 20.0Ꮯ      (4) 42.0Ꮯ

4   First temperature increases.  (1 and 2 are out)

q=mCDT

DT=q/mC=8360J/(100.*4.18J/goC)

DT=200C

22 +20=42

40 Which compound has the strongest hydrogen bonding at STP?

(1) H2O     (2) H2S

(3) H3Se    (4) H3Te

1   H with F,O or N

 

 

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 54-56
 Questions 57-61 Questions 62-65 Questions 66-68 Questions 69-72  Questions 73-75  Questions 76-78  Questions 79-82 Questions 83-85

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