Rates of Reaction and Particle Size What affects the rate of a reaction? Starter: How can I make...
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![Page 1: Rates of Reaction and Particle Size What affects the rate of a reaction? Starter: How can I make sugar dissolve faster in water?](https://reader035.fdocuments.net/reader035/viewer/2022062715/56649d8e5503460f94a779f8/html5/thumbnails/1.jpg)
Rates of Reaction and Particle Size
What affects the rate of a reaction?
Starter:How can I make sugar dissolve faster in water?
![Page 2: Rates of Reaction and Particle Size What affects the rate of a reaction? Starter: How can I make sugar dissolve faster in water?](https://reader035.fdocuments.net/reader035/viewer/2022062715/56649d8e5503460f94a779f8/html5/thumbnails/2.jpg)
Success criteria
• Must – I can name 5 things that can affect the rate of a reaction.
• Should – I can do practical investigations to find out about rates of reaction.
• Could – I can write equations to show my reactions
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Chemical reactions occur when particles of reactant collide with enough energy to react.
Rates of reaction
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What can affect how quickly collisions happen?
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Particle Size
• Will a sugar lump or a tea spoon of sugar dissolve faster?
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Demo 1: Burning magnesium
• What is the difference between burning powdered magnesium and a piece of magnesium?
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2) surface area.
Which will melt faster?
A whole block of jelly.
…jelly chopped into cubes?
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Why do they dissolve faster?
Because if you compare a the whole jelly with the small pieces, the small pieces have a LARGER SURFACE
AREA
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So what?
• The larger the surface area, the more collisions that can happen between the chemicals.
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Temperature
• Will chemicals react faster when it is hot or cold?
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Results
• You will ALL do 0, room temperature and 40 degrees.
• Each group will use a different method and report back.
• WARNING: hot acid is extra dangerous! GOGGLES ON
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Gas collection method 1
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Alternative methods
Measure the amount of mass lost in a given time.
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Gas collection method 2
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Results: Temperature / oC
Time 1 (sec)
02040
Conclusion:I can see that as the temperature increases the rate of the reaction …………………..This is because as the temperature increases the ………………………..
Key words: Kinetic energy, particle, collide, react
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3) What is a catalyst?
• A catalyst is a chemical that speeds up a reaction without being used up.
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Investigation 1:
Apparatus:ZincSulphuric acidWooden splintBeaker PipetteCopper sulphate solution Test tube
Method Put a piece of zinc into a test tube one third full of sulphuric acid. Test for hydrogen (squeaky pop). Now add a few drops of copper sulphate solution and re-test for hydrogen
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Investigation 2
Apparatus Hydrogen peroxideWooden splint Manganese Dioxide Beaker
Method: • Put some hydrogen
peroxide into a test tube. Test for oxygen (re-light a glowing splint). Add a small amount of manganese dioxide. Re-test for oxygen.
•
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Plenary
• Can you think of any other situations at home where surface area has an effect on something.
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Rate of Reaction and concentration
How does concentration affect the rate of reaction?
Starter:
What can happen when particles collide?
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Concentration
• Reactions in solution involve dissolved paticles that must collide before reaction is possible.
• The more crowded (concentrated) the solution, the faster the reaction.
Collisions infrequent Collisions frequent
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Lets investigate
AIM: to investigate how concentration affects the rate of a reaction.
Follow the instructions on the worksheet to find out how the concentration of sodium thiosulphate affects the rate of a reaction.
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Results
• Complete a line graph of your results
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Concentration and Rates
• The rate of a reaction will increase with an increase in concentration because there are more particles.
• The more particles there are, the more reactions will take place
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Plenary
• Produce a revision card for each factor.1) Catalysts2) Particle size3) Concentration4) Temperature
Draw a graph for each.
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3. How can you measure the rate of a chemical reaction?
How fast the reactants are used up.How fast the products are made.
amount of a reactant used or the amount of product formed
time
Rate of Reaction
= _____________________
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