# Lec 10 - Question from Last Time What are the units of the...

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1 1 Question from Last Time! What are the units of the rate constant for a second order reaction? e.g. Rate = k[NO] 2 A) M/s B) M –1 s –1 C) M –2 s –1 D) M s E) M –1 s Rate must have units like mol L –1 s –1 M = mol L –1 Rate Law 2 What does the reaction rate mean? It is a number, like Rate = 56 M/s. A + B 2C at a rate of 56 mol L –1 s –1 . It means that the reaction runs 56 x 6.02 x 10 23 times in 1 L in 1 s It means that in ever liter of solution 2 x 56 x 6.02 x 10 23 C molecules are produced every second! Pretty amazing that we can figure out what is happening on such a tiny scale!

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2 3 Given the following rate law Rate = k [A] 2 [ B] [C] 3 What happens to the rate if the concentration of A is doubled? A) It stays the same. B) It increases by 2X (doubles). C) It increases by 4X (quadruples). D) It decreases. 5 Given the following rate law Rate = k [A] x [ B] y [C] z What is y if the rate doubles (2X) when the concentration of B is quadrupled (4X)? A) y = ½ B) y = 1 C) y = 2 D) y = 4
3 6 Determining Rate Laws from Initial Rates Measure the initial rate of a reaction, See how the initial rate changes as the concentration of each reactant is varied separately. Let’s see how this works.

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Lec 10 - Question from Last Time What are the units of the...

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