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Science (Chemistry) > Organic Chemistry > Flashcards

Organic Chemistry Flashcards

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1
Q

What substances are in alkenes?

A

Methane
Ethane
Propane
Butane

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2
Q

What state are the alkenes at room temperature?

A

Gas

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3
Q

What do alkenes have bond wise?

A

One double covalent bond

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4
Q

How is crude oil formed?

A

From plants and animals that died millions of years ago pressure and heat turned them into crude oil

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5
Q

What is the reaction of alkenes and alkanes?

A

Burn in oxygen to produce carbon dioxide

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6
Q

What is methane’s molecular formula?

A

CH4

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7
Q

What is ethane’s molecular formula?

A

C2H6

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8
Q

What is the molecular formula of butane?

A

C4H10

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9
Q

What is propane’s molecular formula?

A

C3H8

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10
Q

What is the separation of crude oil?

A
  1. Crude oil is separated by fractional distillation
  2. Using heat
  3. To separate fractions, which are mainly alkanes
  4. As fractions move up the tower, they condense from gas back to liquid
  5. Liquids form at different levels because they have different boiling points
  6. Therefore, the liquids can be collected separately e.g. petrol
  7. The fractions at top condense at lower temperature than fractions lower down
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11
Q

What is ethene’s molecular formula?

A

C2H4

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12
Q

What is molecular formula of propene?

A

C3H6

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13
Q

What is molecular formula of butene?

A

C4H8

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14
Q

What is the greenhouse effect?

A

Carbon dioxide produced from combustion builds up in atmosphere, forming layer around earth. When radiation from sun hits earth, some of it is absorbed and some is reflected back into atmosphere. The blanket of carbon dioxide prevents it from escaping and earth heats up (global warming). Carbon dioxide not only greenhouse gas, others include methane and water vapour.

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15
Q

What are the effects of global warming?

A 
Climate change
Polar ice caps melt
Sea levels will rise
Increased flooding
Increased spread of tropical diseases
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16
Q

How do we reduce global warming?

A

Burn less fossil fuels
Plant more trees
Reduce deforestation
More energy efficiency

17
Q

How are polymers made?

A

When many monomers join together chemically to produce very long chain process known as addition polymerisation

18
Q

What is addition polymerisation? Examples?

A 
Monomer has to have double bond between two carbons, more monomers added, 2 examples of addition polymers are:
Polythene 
Polyvinyl chloride (PVC)

Science (Chemistry) (9 decks)

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