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Chemistry Module one of Unit 2. A2 Level.




Module 1: Chemistry
>Measuring the Rate of Reaction from a CONCENTRATION-TIME graph

Rate of Reaction = Change in Concentration / Time for the change to take place
Find a tangent to the graph at the given point, and work out the gradient.…

Page 2

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Chemistry Module one of Unit 2. A2 Level.




>Explain and use the terms Order & Half life

Order is explained previously, the Half Life of a reactant is the time taken for the concentration of
the reactant to reduce by half.

>Deduce the half life of a first ­order reaction…

Page 3

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Chemistry Module one of Unit 2. A2 Level.




changes in concentration do example if concentration equivilant to the change2. For
not change the rate of reaction. doubled then the rate would example a change in
Rate = K[A]0 also double. concentration of 2 times,
Rate = K[B]1 would mean rate…

Page 4

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Chemistry Module one of Unit 2. A2 Level.




>Propose a rate equation that is consistent with the rate-determining step

>Propose the steps in a reaction mechanism from the rate equation and the balanced equation
for the overall reaction

Firstly it is important to understand what is meant by the `Rate…

Page 5

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Chemistry Module one of Unit 2. A2 Level.




2NO + 02 2NO2

RDS ­ is the slowest step in a reaction mechanism of a multi-step reaction

There are two molecules of NO in the rate equation. Possible mechanism outlined below.

NO + NO N2O2

N2O2 + O2 2NO2

>Deduce expressions…

Page 6

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Chemistry Module one of Unit 2. A2 Level.




>Calculate the concentration of quantities of substances present at Equilibrium.

This method is best explained when referring to page 129 in the OCR textbook. The method for
working out the concentration of quantities of substances present at EQ, is the following:

1)…

Page 7

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Chemistry Module one of Unit 2. A2 Level.




>State that Kc is unaffected by changes in concentration, pressure and the presence of a
catalyst.

Although Kc is altered by temperature, its value does not change by changes in concentration &
pressure. Catalysts affect the rate of a reaction, but not…

Page 8

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Chemistry Module one of Unit 2. A2 Level.




>Understand that compromise conditions rely on a balance between Kc and K

To summarise the sections regarding k and Kc so far, we understand that:

K Kc
K is the rate constant, measures the rate of Kc is the equilibrium constant, and…

Page 9

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Chemistry Module one of Unit 2. A2 Level.




>Describe an acid as a proton donor and a base as a proton acceptor.

A Bronsted-Lowry ACID is a proton H+ donor.

A Bronsted-lowry BASE is a proton, H+ acceptor

An Alkali is a base that is soluble in water forming OH-…

Page 10

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Chemistry Module one of Unit 2. A2 Level.




A molecule of an acid must contain hydrogen that can be released as H+. It is important to realise that
although an acid is called a proton donor, it does not just happen on its own. There must always be a
base…

Comments

dan

these notes are fantastic, you dont happen to have the other 2 modules do u? i love the way u follow the spec. :)

Beccy_Wright3107

Last page was very useful :)

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