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Chemistry > Paper 2 - Mistakes > Flashcards

Paper 2 - Mistakes Flashcards

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1
Q

How does enzyme effect rate of reaction

A
  • speeds up
  • creates alternative pathway
  • lowers activation energy
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2
Q

Conditions for cracking

A
  • silica/alumina
    + 600 degrees
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3
Q

Temperature and pressure required for steam

A
  • 300 degrees and 60atm
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4
Q

phenolphthalein acid

A

colourless

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5
Q

phenolphthalein neutral

A

colourless

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6
Q

phenolphthalein alkali

A

pink

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7
Q

methyl orange acid

A

red

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8
Q

methyl orange neutral

A

yellow

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9
Q

methyl orange alkali

A

yellow

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10
Q

Definition of compound

A
  • two different elements
  • bonded together
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11
Q

Why is something malleable

A

same as ductility
- weak interlayer forces
- layers are weak
- so the can slide easily

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12
Q

Why does pressure increase rate

A
  • particles closer
  • more collisions per unit time
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13
Q

How to test for a carboxylic

A
  • magnesium
  • fizzing
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14
Q

Titration

A
  • mix
  • filter
  • wash
  • dry
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15
Q

Why potassium more reactive than sodium [3 marks]

A
  • more electron shells between nucleus and valence shell
  • weaker attraction between
  • lost more easily
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16
Q

How is crude oil seperated in fraction column [4 marks]

A
  • crude oil heated
  • (temp grad) hotter at bottom cooler at top
  • ccompounds rise up the column
  • comndense at bpt
17
Q

How does nitrous oxide form in car

A
  • reacts with O2
  • due to high temps
18
Q

Why is an alloy harder than a metal [3 marks]

A
  • layers are less even
  • because of different size molecules
  • layers cannot slide
19
Q

Why is a reaction exothermic in terms of bonds [2 marks]

A
  • more energy given out when bonds are created
  • than when they are broken
20
Q

What courses glucose to ferment [1 mark]

A
  • yeast
21
Q

Why is fermentation done in the absence of air [2 marks]

A
  • oxygen would react with with ethanol
  • form ethanoic

Chemistry (6 decks)

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