January 2016 Chemistry Regents #83-85

Highlight to reveal answers and explanations

 

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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Questions

 

  Base your answers to questions 83 through 85 on the information below.

Fossil fuels produce air pollution and may eventually be depleted. Scientists are researching ways to use hydrogen as an alternate fuel.

A device called an artificial leaf was invented to produce hydrogen and oxygen using sunlight and water. The artificial leaf is an electrochemical cell. Equations 1 and 2 below represent the reactions taking place in the leaf. Equation 3 represents a reaction of hydrogen when used as fuel.

83 83 State one benefit of using the artificial leaf to produce hydrogen. [1]

Answer-->Fossil fuels are not being used. Almost any viable answer will be accepted.

84 Explain, in terms of energy, why the artificial leaf is an electrolytic cell. [1]

Answer-->Energy is required

85 State the change in oxidation number of oxygen during the reaction represented in equation 3. [1]

Answer-->  0 to -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

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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