organic and physical chemistry

  • Created by: Laila001
  • Created on: 30-04-18 12:18
suggest one reason, other than incomplete combustion or heat transfer to the atmosphere, why the studentsvalue for the enthelpy of combustion of meathanol is diffrent from that in the data book
some of the methanol may have evaporated
1 of 9
the student said correctly that using a thermometer with an overall unceartinty for the rise in tempreature of +- 0.5C was adequate for this experiment , explain why this thermometer was adaquete for this experiment.
because the temprature change is significantly greater than unceartinty
2 of 9
explain how a catalyst works
provides an alternative pathway which requires a lower activation energy
3 of 9
platinum, plalladium and rhodium are metals used inside catalytic converters. a very thin layer of the metal is used in honycomb ceramic support. explain why a thin layer is used in this way
because it takes a small amount of metal but produces a large surface area
4 of 9
explain why determening the precise relative molecular mass of proponal and prop-2-en-1-ol by mass spectrometry could not be used to distinguish between samples of these 2 compounds
because they both have the same Mr (molecular formula) which means that they are identical
5 of 9
explain why 1,1,1-trifluoroethane does not lead to the deploitation of the ozone in the upper atmosphere
because it does not contain any chlorine
6 of 9
give one reason why bonds in molecules such as carbon dioxide and 1,1,1-trifluroethane absorb infared radiation
because the bonds are polar
7 of 9
Anti-bumping granules are placed in the flask when refluxing suggest why these granuels prevent bumping
because they prevent larger bubbles from forming
8 of 9
explain why more 3-bromo-3methylpentane is formed in this reaction than 2-bromo-3methylpentane
because a tertiary carbocation is more stable than a secondary carbocation
9 of 9

Other cards in this set

Card 2

Front

the student said correctly that using a thermometer with an overall unceartinty for the rise in tempreature of +- 0.5C was adequate for this experiment , explain why this thermometer was adaquete for this experiment.

Back

because the temprature change is significantly greater than unceartinty

Card 3

Front

explain how a catalyst works

Back

Preview of the front of card 3

Card 4

Front

platinum, plalladium and rhodium are metals used inside catalytic converters. a very thin layer of the metal is used in honycomb ceramic support. explain why a thin layer is used in this way

Back

Preview of the front of card 4

Card 5

Front

explain why determening the precise relative molecular mass of proponal and prop-2-en-1-ol by mass spectrometry could not be used to distinguish between samples of these 2 compounds

Back

Preview of the front of card 5
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