# rate of reaction

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• Created by: raaaaw
• Created on: 15-01-20 19:55

rates of reaction

mean rate of chemical reaction

the slope of the line gives us an idea of the rate of reaction

the stepper the slope the faster the reaction

when the slope of the line becomes less steep it means that the reaction is slowing down so therefore rate of reaction is decreasing

this is because the reactant molecules  have already reacted and turned into products

which therefore means fewer molecules to react

when the line is flat that means the reaction has stopped

we measure the quantity of reactants formed in grams

if it is a gas it is cm cubed

EXAMPLE

In this chemical reaction 60 g of product was formed in 15 secs

calculate mean rate of reaction

equation is

mean rate of reaction is

quantity of product formed

divide by time taken

also there is quanity of reaction used so not just formed

quantity of reactants used

divided by time taken

using tangents to determined rates

vip : the slope of a curve  is constantly changing

drawing a straight line which just touches the curve at the point we are intersted this straight line is called a tangent

in this case the tangent slope than the one kater in the curve which means that the reaction is faster at the start than the end

to use a tangent to determine the rate of reaction u find a point on the curve lets say 30 seconds then u draw a straight line touching th curve then you construct a triangle then you measure from the sides