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Lecture 2

CHMA11H3 Lecture Notes - Lecture 2: Reaction Rate Constant, Partial Pressure, Negative Feedback

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Jamie Donaldson

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Lecture two (CHMA11H3)
General rate of reaction
Rate of reaction is a rate of the disappearance of a reactant and the appearance of the product
Its unit is concentration/ time
The rate is always positive
Factors affecting reaction rate
1. Concentration
Increasing a concentration of a reactant increase reaction rate
concentration of gases depends on the partial pressure of the gas
o higher pressure = higher concentration
2. temperature
Increasing temperature increases reaction rate
for each 10 °C rise in temperature, the speed of the reaction doubles
3. catalysts
Most catalysts speed up a reaction
o Catalysts are substances that affect the speed of a reaction without being
o catalysts used to slow a reaction are called negative catalysts.
o Catalyst can be homogeneous or Heterogeneous
Homogeneous = present in same phase
Heterogeneous = present in different phase
Rate law
Rate law is a quantitative thing which show how quickly a reaction take place
The rate law can only be determined experimentally
For the reaction a A + b B → c C + d D
Rate = k [A]n[B]m
n and m are called the orders for each reactant
k is called the rate constant
K is constant because it is not affected by concentration
n and m can be
o Fraction
o Negative
This shows the more product there is the bigger the numerator in the rate law
so the slower reaction
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