Formulas for A2 Chemistry

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  • Created by: Simon_Q
  • Created on: 19-02-14 14:39
What is the general format for the formula for the rate of a reaction?
Rate= k(A)^n (B)^m Where n and m are the number of mols of each reactant and A and B are each reactant. The brackets should also be square to show concentrations.
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The pH of a strong acid can be worked out using what formula?
-log(H^+)
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You can rearrange the rate equation to find k. What are the units for k? (don't worry too much about the powers on it for now)
mol^-1 dm^3 s^-1
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Using the formula -Ea/ R = gradient, what is Ea?
-gradient x R.
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What is R?
8.134
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Standard entropy of the system is what…?
Sum of the standard entropy of the products - the sum of the standard entropy of the reactants
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pH of a strong base is…?
-log( Kw/(conc of OH)) where Kw is the water constant.
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What is Kw?
1x10^-14
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Partial pressure can be found with what formula?
(moles/ total moles) x total pressure (P)
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moles/(volume/1000) is the formula to find what?
Concentration (in dm^3)
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As well as strong acids and bases there are weaker ones. What formula can you use to find the pH of a weak acid?
-log((HAxKa)^(1/2)) where ^1/2 is the same as square rooting and HA is concentration and Ka will be given.
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Similarly what formula can be used to work out the pH of a weak base?
14-pOH (you can work out pOH the same way as you would pH)
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-(deltaH/ T) is the formula for what?
Standard entropy of the surroundings.
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Do you add or subtract the standard entropy of the surroundings and system to find delta S total?
Add
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Other cards in this set

Card 2

Front

The pH of a strong acid can be worked out using what formula?

Back

-log(H^+)

Card 3

Front

You can rearrange the rate equation to find k. What are the units for k? (don't worry too much about the powers on it for now)

Back

Preview of the front of card 3

Card 4

Front

Using the formula -Ea/ R = gradient, what is Ea?

Back

Preview of the front of card 4

Card 5

Front

What is R?

Back

Preview of the front of card 5
View more cards

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