2016 Chemical, Energy and Resources Jun Flashcards Preview

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Flashcards in 2016 Chemical, Energy and Resources Jun Deck (7)
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1
Q

At rtp, the first four members of the alkanes are all gases but the first four alcohols are liquid. Explain in terms of intermolecular forces

A
  • Alcohols have hydrogen bonds (and induced dipole)

* Hydrogen bonds are stronger than induced dipoles (in alkanes)

2
Q

Using le Chateliers principle predict the effect on equilibrium.

The gas mixture is compressed

A

• Equilibrium (position) shifts to right

AND turns paler (brown)•

3
Q

Using le Chateliers principle predict the effect on equilibrium.

Placed in a warm water bath

A

• Equilibrium (position) shifts to left
AND turns darker/deeper (brown
• (Forward) reaction is exothermic

4
Q

State two ways in which catalysts help make processes more sustainable

A
  • Lower temperatures/lower pressures (can be used

* (Catalysts are often enzymes) generating specific products

5
Q

Two sources of nitrogen oxides in the stratosphere

A

• Thunderstorms/lightning AND aircraft 

6
Q

Show how nitrogen monoxide catalyses the breakdown of ozone

A
  • NO + O3 -> NO2 + O2

* NO2 + O -> NO + O2

7
Q

The greenhouse effect of a gas in the atmosphere is dependent on two factors

A
  • Abundance (in atmosphere)
  • Ability to absorb infrared/IR (radiation
  • Residence time