chemistry

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  • Created by: siobhan5
  • Created on: 10-05-15 11:58
what information can be obtained from the molecular ion peek in a mass spectrum?
relative molecular mass of the compound
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in what ways could you increase the rate of reaction between zinc and hydrochloric acid?
increase concentration of acid, increase temperature, use powdered zinc, use a catalyst.
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how can you find the rate of reaction from a graph of mass of production against time?
from the gradient or slope of the line
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what is meant by the 'activation energy' of a reaction?
the minimum energy that particles must have for collisions to produce a reaction.
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name two types of reactions that are exothermic.
combustion, oxidation, neutralisation.
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why must calcium carbonate carbonate be heated continuously to convert it into calcium oxide and carbon dioxide?
thermal decomposition is an endothermic reaction.
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nitrogen and oxygen react together to produce nitrogen oxide. What changes in conditions would increase the rate of this reaction.
high temperature, high pressure, catalyst
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explain in terms of particles why increasing the concentration of a reactant increases the rate of the reaction.
particles are closer together (more particles in the same volume) so collisions are more frequent.
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explain why increasing the temperature increases the rate of reaction.
particles gain kinetic energy and start to move around more and at higher speeds, therefore more collisions happen frequently.
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Dilute nitric acid is added to sodium hydroxide solution.1) what type of substance is sodium hydroxide? 2)what type of reaction happens? 3) why is an indicator used to show when the reaction is complete?
1) an alkali 2)neutralisation 3)there is no visible change and it will show when the pH is 7
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why are some items of jewellery made of gold-plated nickel?
less expensive than pure gold, to improve appearance, so they do not corrode or cause allergic reactions.
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why is manufacturing aluminium an expensive process?
it needs both large amounts of electricity and high temperatures to melt the aluminium oxide.
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why is cryolite used in the process to make aluminium?
to lower the melting/ operating temperature
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explain as fully as you can what happens at the electrode when molten sodium chloride is electrolysed.
at the negative electrode: sodium ions gain electrons/ are reduced to sodium atoms (metal). At the positive electrode: chloride ions lose electrons, are oxidised to chlorine atoms which form chlorine molecules/ gas.
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Other cards in this set

Card 2

Front

in what ways could you increase the rate of reaction between zinc and hydrochloric acid?

Back

increase concentration of acid, increase temperature, use powdered zinc, use a catalyst.

Card 3

Front

how can you find the rate of reaction from a graph of mass of production against time?

Back

Preview of the front of card 3

Card 4

Front

what is meant by the 'activation energy' of a reaction?

Back

Preview of the front of card 4

Card 5

Front

name two types of reactions that are exothermic.

Back

Preview of the front of card 5
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