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Question
Which of the following chemical equations corresponds to Ka3 of phosphoric acid?
A.HPO42-(aq) + H2O(
) 
PO43-(aq) + H3O+(aq)
B.PO43-(aq) + H2O() HPO42-(aq) + OH-(aq)
C.H3PO4(aq) + H2O() H2PO4-(aq) + H3O+(aq)
D.H3PO4(aq) + 2 H2O() HPO42-(aq) + 2 H3O+(aq)
E.H2PO4-(aq) + H2O() HPO42-(aq) + H3O+(aq)
Answer
This answer is hidden. It contains 2 characters.
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What is the half-life of a first-order reaction if it takes 4.4 10-2 seconds for the concentration to decrease from 0.50 M to 0.20 M?A.2.5 10-2 sB.3.3 10-2 sC.1.6 sD.21 sE.27 s
Q:
Hydrogen peroxide decomposes into water and oxygen in a first-order process.
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A student analyzed a first-order reaction and obtained the graph below. Unfortunately, the student forgot to label the axes. What are the correct labels for the x and y axes? A.x axis = time, y axis = ln[A]
B.x axis = ln[time], y axis = [A]
C.x axis = ln[time], y axis = [A]
D.x axis = time, y axis = 1/[A]
E.x axis = 1/time, y axis = 1/[A]