What are the four factors that affect the rate of a reaction?
temperature , concentration , particle size , catalysts
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What must happen for reactions to occur?
The particles must collide
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What are successful colisions?
the collsions that cause a chemical reaction
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What is collision theory?
The greater the number of 'successful collisions' the faster the reaction
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what does increasing the temperature do to a reaction and why?
increases ( speeds up) high temperatures gives the particles more energy allowing more collisions
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what does increasing the concentration do to a reaction and why?
increases ( speeds up) high concentration gives the particles more energy allowing more collisions
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what does decreasing the particles size do?
by decreasing the particle size you are increasing the surface area giving a higher chance for collisions
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what is special about a catalyst ?
A catalyst speeds up the rate of a reaction but it is not used up in the reaction.
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how does using a catalyst affect temperature?
If a catalyst is present, the reacting particles can collide more successfully with less energy and so the reaction can take place at a lower temperature
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what are enzymes and what do they do?
they are biological catalysts that help with digestion
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how are enzymes 'specific'?
they can only catalyse one reaction
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what are enzymes best working temperature?
body temperature - 37
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what happens to enzymes at high and low temperatures?
low = less effective & high = change shape and become denatured
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what is the rate of a chemical reaction?
how fast the reactants are being used up and how fast the products are being made
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what changes can be measured in reactions?
concentration , volume and mass
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how do you calculate the average rate?
change in measurable quantity divided by change in time
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what is the measurable unit for grams?
(g) ex = grams per second ( g-1s-1)
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what is the measurble unit for concentraion?
( mols ) ex =moles per litre ( mol-1 l-1 )
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what is the measurable unit for volume ?
( cm^3 ) ex = volume per second ( cm^3s-1 )
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what line in a rate of reaction graph has the steeper gradient?
Magneta
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Other cards in this set
Card 2
Front
What must happen for reactions to occur?
Back
The particles must collide
Card 3
Front
What are successful colisions?
Back
Card 4
Front
What is collision theory?
Back
Card 5
Front
what does increasing the temperature do to a reaction and why?
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