chemistry

  • Created by: Dymphna
  • Created on: 18-04-13 18:44
what is cracking?
the break down of large hydrocarbon molecules.
1 of 27
how do you crack a hydrocarbon?
heating a mixture of hydrocarbon vapours and steam at a very high temperature or passing hydrocarbon vapours over a hot catalyst
2 of 27
what does unsaturated hydrocarbon mean?
a hydrocarbon whose molecules contain at least one carbon-carbon double bond
3 of 27
what test can be used to detect an alkene?
bromine water
4 of 27
what is a polymer?
a substance made from very large molecules made up of many repeating units
5 of 27
name two common polymers
polyethene and polypropene
6 of 27
name six uses of polymers
packaging, clothing, dental fillings, fabric, pillows, duvets
7 of 27
what does biodegradeable mean?
materials that can be broken down by microorganisms
8 of 27
name two sources of plant oils
vegetable oil, sunflower oil,
9 of 27
name two important uses of plant oils
cooking, making emulsions
10 of 27
why do we use vegetable oil for cooking?
higher boiling point so cooks faster, changes flavour, more energy
11 of 27
name one disadvantage of cooking with vegetable oil
give you heart disease
12 of 27
what are emulsions?
a mixture of liquids that do not dissolve in each other
13 of 27
name three properties of emulsions
opaque, thick, better texture
14 of 27
name three emulsions
milk, cream, ice cream
15 of 27
what is hydrophillic?
the water-loving part of an emulsifier molecule
16 of 27
what is a hydrophobic?
the water-hating part of an emulsifier molecule
17 of 27
whats the difference between unsaturated and saturated?
saturated contain the most fat
18 of 27
how do you harden an unsaturated oil into solid?
by reacting it with hydrogen so that some of the carbon-carbon double bonds become single bonds
19 of 27
describe the structure of the earth
inner core, outer core, mantle, crust, atmosphere
20 of 27
what are tectonic plates?
the huge slabs of rock that make up the earths crust and top part of its mantle
21 of 27
what causes tectonic plates to move?
convection currents
22 of 27
what two events occur when plates move suddenly?
earthquakes, tidal waves
23 of 27
what are the proportions of different gases in the atmosphere?
carbon dioxide, water vapour and nitrogen
24 of 27
what caused the release of gases that formed the early atmosphere?
volcanoes released the gases.
25 of 27
how were the seas formed?
as the earth cooled the water vapour condensed and formed seas
26 of 27
what produced the oxygen?
plants
27 of 27

Other cards in this set

Card 2

Front

how do you crack a hydrocarbon?

Back

heating a mixture of hydrocarbon vapours and steam at a very high temperature or passing hydrocarbon vapours over a hot catalyst

Card 3

Front

what does unsaturated hydrocarbon mean?

Back

Preview of the front of card 3

Card 4

Front

what test can be used to detect an alkene?

Back

Preview of the front of card 4

Card 5

Front

what is a polymer?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Science resources:

See all Science resources »See all Chemistry resources »