January 2013 Chemistry Regents #83-85

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Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Questions 51 Questions 52-54 Questions 55-58 Questions 59-61 Questions 62-65 Questions 66-69

Questions 70-72 Questions 73-76 Questions 77-79 Questions 80-82 Questions 83-85

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Questions

 

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

In one method of making bread, starch is broken down into glucose. Zymase, an enzyme present in yeast, acts as a catalyst for the reaction in which the glucose reacts to produce ethanol and carbon dioxide. The carbon dioxide gas causes the bread dough to rise. The balanced equation below represents the catalyzed reaction.

  zymase  

C6H12O6(aq)

==>

 2CH3CH2OH(aq) +  2CO2(g)

83 Identify the type of organic reaction represented by this equation. [1]

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fermentation

 

84 Identify the functional group in an ethanol molecule. [1]

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-OH-OH

alcohol group

Note: Do not allow credit for hydroxide or OH.

85 State how the catalyst, zymase, increases the rate of this reaction. [1]

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Zymase provides an alternate reaction pathway.

A reaction that involves zymase has a lower activation energy.

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Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Questions 51 Questions 52-54 Questions 55-58 Questions 59-61 Questions 62-65 Questions 66-69

Questions 70-72 Questions 73-76 Questions 77-79 Questions 80-82 Questions 83-85

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