Chemisrty - Paper 2

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  • Created by: darcylizz
  • Created on: 08-06-17 18:37
What are two features of a reaction at equilibrium?
1.Concentration of products and reactants remain constant 2. Forward reaction rate is equal backward reaction rate
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Why does a smaller sufrace area mean a lower boiling point?
Weaker Van der Waals forces *between molecules*
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What are the conditions and catalyst needed for the hydration of ethene?
Solid Phosphoric Acid catalyst, Steam at 300 degrees, pressure 60atm and high temperature
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What is needed for the fermentation of glucose?
Yeast, Anaerobic conditions and temperature 30-40 degrees
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What catalyst and condition is used in the dehydration of ethanol?
Concentrated sulfuric acid or phosphoric acid, and high temperature
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What reagent and conditions are needed for Electrophilic Addition to form a sulfate?
Cold Concentrated Sulfuric Acid
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What reagent and condition is needed for the formation of a alcohol from the sulfate?
Add cold water and warm the product and a hydrolysis reaction takes place forming an alcohol
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What species can be used as electrophiles?
Positively charged ions e.g. H+ or Polar Molecules e.g. HBr Br2
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What conditions and reagent is needed for Elimination?
Ethanolic OH- heat under reflux
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What conditions and reagent is needed for Nuceophilic Substitution using OH-?
Aqueous OH-, heat under reflux
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What is needed to form a Amine?
Warm a halogenalkane with Ethanolic Ammonia
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What is needed to form a Nitrile?
Warm a halogenalkane with Ethanolic Potassium Cyanide
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Why is a catalyst more effective coated on a honeycomb?
Increases surface area so there is more sucessful collsions and may mean less of the catalyst has to be used
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What is the role of bacteria in fermentation?
Speeds up rate of reaction by catalysing it
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Why is experimental enthalpy change lower than actual value?
Reactants or products not in their standard states, incomplete combustion or heat loss.
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What type of intermolecular force is present in Alcohols, Ketones, Aldehydes, Amines, Halogenalkanes and Carboxylic acids?
Halogenalkanes, Ketones, Aldehydes = Permanent dipole, Amines, Alcohols, Carboxylic acids = Hydrogen bonding
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In terms of electron transfer, what is an oxidising agent?
An electron acceptor
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How is Geometric isomerism produced?
Double bond restricts bond rotation, and is two different groups on each of the C=Cs
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What are the advantages and disadvantages to fermentation when compared to hydration?
-Sustainable -Batch Process -Lower cost for equip and plants -Lower temp and pressure used -Ethanol is not pure -Slower reaction -Low atom economy -Land used for sugar crops not food crops
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How do you distinguish between Primary and Secondary Alcohols and Tertiary ones?
Add acidified potassium dichromate and warm mixture, Primary and Secondary-green solution, Tertiary-remains orange
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How do you use Tollenes' reagent to test of Aldehydes?
Add silver nitrate, add dilute sodium hydroxide, add dilute ammonia untill brown precipitate dissolves then heat in water bath and add sample. Aldehyde = Silver mirror, Ketone = no change
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What solutions can you use to distinguish between Aldehydes and Ketones?
Add Fehling's or Benedict's solution. Aldehyde = Brick red precipiate, Ketone = remains blue
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How do you test for a Carboxylic acid?
Add sodium carbonate, bubble gas produced through limewater. Carboxylic Acid = Limewater turns cloudy and solution fizz when solid sodium carbonate added
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What catalyst is used in catalytic cracking?
Zeolite (reaction produces less alkenes than thermal cracking)
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Other cards in this set

Card 2

Front

Why does a smaller sufrace area mean a lower boiling point?

Back

Weaker Van der Waals forces *between molecules*

Card 3

Front

What are the conditions and catalyst needed for the hydration of ethene?

Back

Preview of the front of card 3

Card 4

Front

What is needed for the fermentation of glucose?

Back

Preview of the front of card 4

Card 5

Front

What catalyst and condition is used in the dehydration of ethanol?

Back

Preview of the front of card 5
View more cards

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