Chemistry- The speed of a reaction

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  • Created by: Kitsune
  • Created on: 07-07-16 06:38
Define rate
A measure of change that happens in a single unit of time
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What do you measure to find rate?
The amount of reactant used up or the amount of product produced per unit of time
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What equipment is used to collect and measure gas produced?
A gas syringe
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What experiment can you carry out to produce hydrogen?
Clean Mg stripe with sandpaper, put HCl acid in a flask, drop Mg inside and quickly put the stopper with the string in
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When is the rate of the reaction greatest?
At the start
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How does the curve on the graph depend on the speed?
The faster the reaction the steeper the curve
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When does the curve go flat?
When the reaction stops
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How to find the average rate of the reaction with a gas?
Total volume of gas produced / Total time taken
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Why is the temperature in the fridge low?
To slow down reactions that make food rot
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Does changing rate change the amount of yield produced?
No, it is random
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Wha are the ways to increase the rate of a reaction?
Increase temperature/concentration/surface area/ pressure and by adding a catalyst
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How does increasing concentration affect the rate?
The are more particles that can react so the chance of successful reactions increases and they happen more frequently so the rate increases
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How does increasing temperature affect the rate?
Particles move faster, collide more frequently, more collisions have the energy to be successful so the rate increases
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How to increase the temperature to double the rate?
By 10 degrees
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How does increasing surface area affect the rate?
More particles are able to react, chance of collision increases and the collisions happen more frequently so the rate increases
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What can a very fast reaction lead to?
An explosion
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Why can an explosion happen in a flour mill?
Particles are tiny so flour has a huge surface area and can easily catch fire. If there is enough flour dust in the air a spark can lead to an explosion
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Why can an explosion happen in coal mines?
Methane mixes with other flammable gases and at a certain concentration they form an explosive mix so a spark is enough to lead to an explosion
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What is a catalyst?
A substance that speeds up the reaction but remains chemically unchanged itself
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What is an enzyme?
A protein that acts as a biological catalyst
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What are the uses of enzymes?
Making biological detergents and making food
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How does a catalyst work?
The particles are able to react with less energy so more collisions have enough energy to be successful and the rate increases
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Which substances are catalysts?
Transition metals and their oxides
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What does photochemical mean?
A reaction that obtains the energy it needs from light
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How to speed up a photochemical reaction?
Increase the intensity of light
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What happens in film photography?
The gel that coats the film contains silver bromide. When light enters it breaks down to silver and bromine. Unreacted silver bromide is washed away and silver is left, giving darker areas.
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What type of reactions happen in film photography?
Redox and photochemical
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Other cards in this set

Card 2

Front

What do you measure to find rate?

Back

The amount of reactant used up or the amount of product produced per unit of time

Card 3

Front

What equipment is used to collect and measure gas produced?

Back

Preview of the front of card 3

Card 4

Front

What experiment can you carry out to produce hydrogen?

Back

Preview of the front of card 4

Card 5

Front

When is the rate of the reaction greatest?

Back

Preview of the front of card 5
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