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Chemistry > C1- Carbon Chemistry > Flashcards

C1- Carbon Chemistry Flashcards

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1
Q

What does **finite resources **mean?

A

Are no longer being made or are being made extremely slowly such as fossil fuels

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2
Q

What is a non-renewable resource?

A

Are being used up faster than they are being formed, such as fossil fuels

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3
Q

What are the difficulties associated with the finite resource of crude oil?

A
  • all readily extractable resources will be used up in the future
  • finding replacements
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4
Q

What is crude oil made up of?

A

A mixture of many types of oil, which are all hydrocarbons

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5
Q

What is a hydrocarbon?

A

Made up of molecules containing **carbon **and hydrogen ONLY

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6
Q

Where does crude oil get separated?

A

In a fractional distillation column

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7
Q

How does the **temperature gradient **work in the fractional distillation column?

A
  1. Oil that doesn’t boil sinks as bitumen, a thick liquid at the bottom with a very high boiling point.
  2. Other fractions boil and their gases rise up the column
  3. The column is cooler at the top, so fractions with lower boiling points exit at the top
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8
Q

What are the forces between molecules?

A
  • Forces between molecules are **intermolecular forces **and are broken during boiling
  • Liquid separates as gas molecules
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9
Q

How do larger molecules get separated?

A

They have strong forces of attraction, so a lot of energy is needed to break the forces between molecules, so they have high boiling points

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10
Q

How do smaller molecules get separated?

A

They have weaker attractive forces and are easily separated. Less energy is needed to break the forces between the molecules and have low boiling points

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11
Q

How does **transporting **crude oil cause problems?

A
  • Oil slicks can damage birds’ feathers and cause death
  • Clean-up operations use detergents that can damage wildlife
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12
Q

What are the **political **problems with extracting crude oil?

A
  • UK is dependent on oil and gas from politically unstable countries
  • Oil-producing nations set up high prices and cause problems for the future supply of non-oil producing nations
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13
Q

What does the process **cracking **do?

A

Turn large alkane molecules into smaller alkane molecules and **alkene **molecules

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14
Q

Why is the alkene molecule useful?

A

It has a double bond, which makes it useful for making polymers

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15
Q

Why does cracking help oil manufacturers?

A

It helps match supply with demand for products like petrol

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16
Q

What are the factors influencing the choice of fuel?

A
  • energy value
  • availability
  • storage
  • cost
  • toxicity
  • pollution caused
  • ease of use
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17
Q

Why is the amount of fossil fuels being burnt increasing?

A

Populations are increasing

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18
Q

What are the concerns of the increase in fossil fuels?

A

More carbon dioxide emissions could result in the speeding up of Global Warming

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19
Q

What is the equation for **complete **combustion?

A

hydrocarbon + oxygen → carbon dioxide + water

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20
Q

What is the equation for **incomplete **combustion?

A

fuel + oxygen → carbon monoxide + carbon + water

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21
Q

What are the differences between complete and incomplete combustion?

A
  • more **energy **is released during complete combustion
  • **toxic **gas (carbon monoxide) and soot (carbon) is made during incomplete combustion
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22
Q

What is clean air made up of?

A
  • 78% nitrogen
  • 21% oxygen
  • 1% - only 0.035% carbon dioxide
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23
Q

Why do the percentages only change by a small amount?

A

There is a balance between the processes that use up and make both CO2 and O2. As the carbon cycle shows

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24
Q

How has the percentage of carbon dioxide in the air increased?

A
  • deforestation (less photosynthesis can take place)
  • increased population (world’s energy requirements increase, so more factories producing pollution)
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25
Q

What formed the atmosphere?

A

Gases escaping the interior of the Earth

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26
Q

How did the Earth get oxygen?

A

The plants that could photosynthesise removed carbon dioxide from the atmosphere and added oxygen

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27
Q

What supposedly caused oceans?

A

The water vapour condensed to form oceans and the carbon dioxide dissolved in the water

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28
Q

What does sulfur dioxide cause?

A

When dissolved in water, it forms acid rain that damages wildlife and limestones buildings/ statues

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29
Q

What does a catalytic converter do?

A

Changes carbon monoxide to carbon dioxide

30
Q

What reaction takes place in a catalytic converter?

A

Nitric oxide and carbon monoxide react on the surface of the catalyst and form natural components of air - nitrogen and carbon dioxide.

2CO + 2NO → N2 + 2CO2

31
Q

What is the definition of a hydrocarbon?

A

A compound of carbon and hydrogen atoms ONLY

32
Q

What are alkAnes?

A

Hydrocarbons that have single covalent bonds only

33
Q

What are alkEnes?

A

Hydrocarbons that have a double covalent bond between carbon atoms

34
Q

What experiment is used to test for an alkene?

A

When orange bromine water is added to an alkene it turns colourless (decolourises). The colourless compound formed is a di-bromo compound by an addition reaction

35
Q

What is a saturated compound?

A

One that has single covalent bonds between carbon atoms, such as alkanes

36
Q

What is an unsaturated compound?

A

One that has at least one double covalent bond between carbon atoms, such as alkenes

37
Q

What is addition polymerisation?

A

The process in which many alkene monomers react to give a polymer.

38
Q

What does the polymerisation reaction need to be able to happen?

A
  • high pressure
  • catalyst
39
Q

What is the displayed formula of ethene?

A
40
Q

What is the displayed formula of poly(ethene)

A
41
Q

What is the addition polymerisation reaction?

A

Many unsaturated monomer molecules (alkenes) form a saturated polymer

42
Q

What are the properties of nylon?

A
  • tough
  • lightweight
  • keeps water out
  • keeps UV light out
  • water vapour cannot enter/leave
43
Q

What are the properties of GORE-TEX?

A
  • same properties as nylon
  • breathable (water vapour can pass through the membrane but rainwater cannot)
44
Q

How is GORE-TEX breathable?

A
  • it is made from a PTFE (polytetrafluoroethene) / polyurethane membrane
  • holes in PTFE are too small for water to pass through but are big enough for water vapour to pass through
45
Q

What is done to PTFE to make it stronger?

A

It is laminated onto nylon

46
Q

What polymers are scientists trying to develop?

A
  • polymers that dissolve
  • biodegradable polymers
47
Q

What are the environmental and economic issues with use of existing polymers?

A
  • disposal of non-biodegradable polymers means landfill sites get filled quickly
  • landfills waste land that could be valuable
  • disposal by burning makes toxic gases
  • disposal or landfills wastes the crude oil that was used to make polymers
  • difficult to sort out different polymers, so recycling is hard
48
Q

What are atom in polymers held by?

A

strong covalent bonds

49
Q

What are the properties of plastics?

A
  • weak intermolecular forces between polymer molecules
  • low melting points
  • stretched easily (polymer molecules slide over each other)
50
Q

What are the properties of plastics with strong forces?

A
  • high melting point
  • cannot be stretched
  • rigid
51
Q

How are protein molecules changed when cooked?

A
  • permanently change shape (denaturing)
  • texture changes
52
Q

What happens when a carbohydrate is cooked?

A
  • starch grains swell up and spread out
  • cell walls rupture
  • resulting in loss of rigid structure
  • soft texture produced
53
Q

What happens when sodium hydrogencarbonate is heated?

A

It decomposes to give carbon dioxide

sodium hydrogencarbonate → sodium carbonate + carbon dioxide + water

2NaHCO3 → Na2CO3 + CO3 + H2O

54
Q

What are emulsifiers?

A

Molecules that have a water-loving (hydrophilic) part and an oil/fat-loving (hydrophobic) part

55
Q

How does and emulsifier stop water and oil from separating?

A
  • hydrophilic end bonds to water molecules
  • hydrophobic end bonds to oil/fat molecules
  • hydrophilic end attracted to water molecules, which surround the oil, keeping them together
56
Q

What is the equation for making an ester?

A

alcohol + organic acid → ester + water

57
Q

What experiment can be done to make an ester?

A
  1. acid is added to alcohol and heated for some time
  2. condenser stops the gas from escaping and helps cool it down again, so it can react more
  3. condenser allows the reaction to go on longer
58
Q

What properties must a perfume have?

A
  • evaporate easily (to reach the nose)
  • non-toxic
  • not react with water (so does not react with perspiration)
  • not irritate the skin (so can be put directly onto skin)
  • insoluble in water (so cannot be washed off easily)
59
Q

What is a solution?

A

A mixture of solvent and solute that does not separate out

60
Q

Explain volatility (ease of evaporation) of esters, in terms of kinetic energy

A
  • in order to evaporate, particles in a liquid need sufficient kinetic energy to overcome forces of attraction to other molecules in liquid
  • weak attractions exist between particles of the liquid, so is easy to overcome these attractions
61
Q

Why does water not dissolve nail varnish?

A
  • attraction between water molecules is stronger than the attraction between water molecules and nail varnish molecules
  • attraction between nail varnish molecules is stronger than the attraction between water molecules and nail varnish molecules
62
Q

What is a colloid?

A

Particles are mixed and dispersed with particles of a liquid but not dissolved

63
Q

Why will the components of a colloid not separate?

A

Particles are scattered or dispersed throughout the mixture and are too small to settle at the bottom

64
Q

Why do most paints dry?

A
  • paints are applied as a thin layer
  • solvent evaporates
65
Q

How do water (emulsion) paints dry?

A

Solvent evaporates and oil forms a protective skin

66
Q

How do oil paints dry?

A
  • solvent evaporates
  • oil is oxidised by atmospheric oxygen
67
Q

What are thermochromic pigments?

A

Change colour at different temperatures

68
Q

What are thermochromic pigments used for?

A
  • cups/mugs
  • fridges
  • electric kettles
  • babies’ spoons and bath toys
69
Q

What are phosphorescent pigments?

A

Glow in the dark

70
Q

How do phosphorescent pigments glow in the dark?

A
  • absorb and store energy
  • release energy as light over a period of time
71
Q

Why are phosphorescent pigments better than radioactive paints?

A

They are safer

Chemistry (6 decks)

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