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Summary Edexcel iGCSE Chemistry Revision notes on organic & rates £5.98   Add to cart
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Summary Edexcel iGCSE Chemistry Revision notes on organic & rates
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I used this document in my GCSE revision and it helped me to achieve a Grade 8 in my final chemistry GCSE exam (edexcel igcse board). These notes are made based on the CGP GCSE guide.

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  • October 19, 2024
  • 3
  • 2023/2024
  • Summary

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Rates of Reaction
Rate of reaction : the speed at which reactants turn into products


Slow reaction Moderate reaction Fast reaction

the rusting of iron metal magnesium reacting with explosions/fireworks
↳ (years/decades) an acid to produce a gentle ↳ La fraction of a second
stream of bubbles

↳ (minutes
grams's grams's

Rate of reaction Quantity of products formed Rate of reaction Quantity of reactants used

Time taken Time taken

S S




f
m-


faster Steeper line faster
vol. of product produced




products
=
,
more

and more reactants reaction

m-


the line gradually
faster reaction with
becomes less steep as
the same amount of
the reactants are used up
reactants

m-



original reaction


time (s)


Covision Theory
The rate of a chemical reaction depends Om :



1) The collision frequency (double frequency of collisions , double the rate)
2) Energy transferred during a collision (particles need enough energy for a successful

collision

Activation energy : the minimum amount of energy particles need to react

↳
greater activation energy more energy needed to start the reaction
↳ this must be supplied (e
.g. heating
increasing the number of collisions ,
increases the rate of reaction


Factors that affect the rate of chemical reaction
1) Temperature 2 Concentration (/pressure
.
. Surface
3 Area
COLD HOT
increase




D-
&




& &

1 . increased temperature = more more concentrated =
more breaking a solid reactant into

Kinetic energy (for particles reactant particles in the smaller pieces increases the surface

2 increased same volume area to volume ratio
.
.
temperatures = - >
making
increased energy of collisions collisions more likely +
↳
surrounding particles have more

area to work on and the
: more successful collisions increasing the rate of
frequency of collisions increase
+
reaction
at higher temperatures increase in rate of reaction
.

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