June 2009 Chemistry Regents #74-76

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Base your answers to questions 74 through 76 on the information below.

During a bread-making process, glucose is converted to ethanol and carbon dioxide, causing the bread dough to rise. Zymase, an enzyme produced by yeast, is a catalyst needed for this reaction.

74 Balance the equation in your answer booklet for the reaction that causes bread dough to rise, using the smallest whole-number coefficients. [1]

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  1 C6H12O6===> 2 C2H5OH + 2 CO2

75 In the space in your answer booklet, draw a structural formula for the alcohol formed in this reaction. [1]

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76 State the effect of zymase on the activation energy for this reaction. [1]

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Zymase lowers the activation energy.

(It's an enzyme which is a catalyst)

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