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Author Question: A second-order reaction has a half-life of 18 s when the initial concentration of reactant is 0.71 ... (Read 158 times)

KimWrice

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on: Aug 27, 2018
A second-order reaction has a half-life of 18 s when the initial concentration of reactant is 0.71 M. The rate constant for this reaction is ________ M-1s-1.
 
  A) 7.8  10-2
  B) 3.8  10-2
  C) 2.0  10-2
  D) 1.3
  E) 18

Question 2

Why does fluoride treatment render teeth more resistant to decay?
 
  A) Fluoride kills the bacteria in the mouth that make the acids that decay teeth.
  B) Fluoride stimulates production of tooth enamel to replace that lost to decay.
  C) Fluoride reduces saliva production, keeping teeth drier and thus reducing decay.
  D) Fluoride converts hydroxyapatite to fluoroapatite that is less reactive with acids.
  E) Fluoride dissolves plaque, reducing its decaying contact with teeth.
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Ahernandez18

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Reply #1 on: Aug 27, 2018
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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KimWrice

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Reply #2 on: Aug 27, 2018
Thank you!


Ahernandez18

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Reply #3 on: Aug 27, 2018
Always glad to help...


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