Topscore and Kaplan Disagree in Kinetics

[jorasic]

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In Kaplan BB, pg 843 2008 edition, it says that 1st order reactions are dependent on the concentration of the reactant. It says zero order is independent of conc.

But Topscore 3 Gchem #18 says 1st order is independent of conc.

I believe Topscor eis wrong here. 1st order ARE dependent on the conc of reactant. I mean, look at the SN1's rate law.

Just to let you guys know, look at multiple resources . Then search for what's right in the actual textbook!

 

[bryantje]

If I remember correctly, the Topscore question had to do with half-life calculation for 1st order reactions. I didn't know this either at the time, but if you look at Chem textbooks they show you an equation where 1/2 life = ln2 / k for 1st orders (different for 2nd orders). In this instance, half-life is independent of concentration of reactants. Double check to make sure though

 

[PrivateJoker]

Zero order have a constant rate and kinetics are independent upon concentration of the reactants.

1st order depends on the concentration of only one reactant (raised to the 1st power), meaning any other reactants would be zero order and independent of concentration.

Radioactive decay and half life also follows 1st order kinetics.

2nd order is dependent on the on one reactant concentration raised to the 2nd power or two reactants raised to the first power