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Author Question: An enzyme that catalyzes addition or removal of hydrogen or oxygen on substrate molecules is a(an) ... (Read 35 times)

charchew

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on: Aug 27, 2018
An enzyme that catalyzes addition or removal of hydrogen or oxygen on substrate molecules is a(an) ________.
 
  A) ligase
  B) isomerase
  C) oxidoreductase
  D) transferase
  E) hydrolase

Question 2

Lead ions can be precipitated from aqueous solutions by the addition of aqueous iodide: Pb2+(aq) + 2I-(aq)  PbI2(s) Lead iodide is virtually insoluble in water so that the reaction appears to go to completion.
 
  How many milliliters of 3.550 M HI(aq) must be added to a solution containing 0.700 mol of Pb(NO3)2(aq) to completely precipitate the lead?
  A) 2.54  10-3 mL
  B) 394 mL
  C) 197 mL
  D) 0.197 mL
  E) 0.394 mL

Question 3

To prepare a buffer using sodium phosphate, which of the following would also be needed?
 
  A) hydrochloric acid
  B) ammonium hydroxide
  C) ammonium phosphate
  D) phosphoric acid
  E) sodium hydroxide


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cloud

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Reply #1 on: Aug 27, 2018
Answer to Question 1

C

Answer to Question 2

B

Answer to Question 3

D


charchew

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Reply 2 on: Aug 27, 2018
Great answer, keep it coming :)

helenmarkerine

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Reply 3 on: Yesterday
:D TYSM

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