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Chemical bonds (MC)

Page history last edited by Joe Redish 2 years, 6 months ago

6.4.P13

 

For all of the problems below put the letters corresponding to all the correct answers for each question. Note you will lose credit both for not including a correct answer AND for including an incorrect one.

 

A. Choose the answer or answers that correctly complete the following sentence. An O-P bond in ATP is referred to as a "high energy phosphate bond". Which of the following statements are true about that bond?

  1. The bond is a particularly stable bond.
  2. The bond is a relatively weak bond.
  3. Breaking the bond releases a significant quantity of energy.
  4. A relatively small quantity of energy is required to break the bond

 

B.The release of energy during the combustion of ethylene, C2H4(g) + 3O2(g) → 2CO2(g) + 2H2O(g) (exothermic) is due to:

  1. Breaking the C-C bond
  2. Breaking the C-H bonds
  3. Breaking the O-O bonds
  4. Forming the C-O and O-H bonds

 

 

C.The figure at the right shows the interaction potential between two molecules (along a particular orientation of the two molecules). The units of r are nm. Two possible states of the molecule are shown: one is labeled E1, the other E2. Which of the following statements are correct?
  1. When the molecules are in the state E1, they are more stable than when they are in the state E2.
  2. When the molecules are in the state E2, they are more stable than when they are in the state E1.
  3. When the molecules are separated by a distance of 5 nm, the force between them is attractive.
  4. When the molecules are separated by a distance of 2 nm, the force between them is attractive.
  5. When the molecules are separated by a distance of 7 nm, the force between them is attractive.
 

 

Joe Redish 8/16/12

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