# Chem4 all notes

These contain all the notes from the book and I don't think I missed anything out other than the data you get given on the data sheet that I didn't need to write about

- Created by: liam
- Created on: 21-06-12 16:15

First 187 words of the document:

CHEM4

Chapter 1.1 rate of chemical reactions

Rate of reaction is the change in concentration with unit time

To find the rate of reaction at an

instant, plot a graph with

concentration and time

and place a tangent at the curve and

find the gradient.

1.2 rate expression and order of reaction

Rate = K[A][B]

A and B both have the order 1 The overall order is 2

Rate = K[A][B]2

B has an order 2 which means it has double the effect on rate as A The overall order is 3

The units of K depends on the overall order of a rate equation:

Rate = K[A][B] can be turned into

Rate = K which the units are Moldm3S1 The units on top

[A][B] Moldm3 x Moldm3 cancel out and the

bottom unit goes

above the divide and

( The unit S1 stays the same because it does not get so the units invert to

cancelled and is on top of the divide ) form Mol1dm3S1

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