Chemistry Topic 5 Flashcards
1
Q
Alkene
A
Turns bromine water colourless
Double bonds
Unsaturated
2
Q
Fuel cells
A
Use hydrogen and oxygen to make electricity
3
Q
Thermal decomposition
A
Breaking things down using heat
4
Q
Cracking
A
- Breaks down long less useful hydrocarbons into smaller more useful ones
- Meets demand
5
Q
Non biodegradable plastics
A
-toxic products when burnt
-don’t rot so stay in landfill
-recycling is expensive due to sorting and transportation
Solves some disposal problems
6
Q
Making polymers
A
Joining together lots of monomers to form very large molecules
7
Q
Acid rain
A
- caused by sulphur dioxide mixing with clouds to form dilute sulphuric acid
- causes lakes to become acidic- kills plants/ animals
- kills trees
- damages limestone buildings
8
Q
Greenhouse effect
A
- carbon dioxide + methane act as an insulating layer absorb most of heat that would normally go into space.
- Gases trap the hot air
9
Q
Iron seeding
A
- Iron is needed by plants for photosynthesis
- Putting iron into oceans- growth of phytoplankton
- these blooms absorb CO2 from the atmosphere for photosynthesis
10
Q
Human activity- affects CO2 levels
A
- Deforestation
- Burning fossil fuels
11
Q
Crude oil
A
- Mixture of hydrocarbons
- separated by fractional distillation
12
Q
Complete combustion
A
- When there’s plenty of oxygen
- hydrocarbon + oxygen -> carbon dioxide +water + energy
- Blue flame
- releases lots of energy
13
Q
Incomplete combustion
A
- not enough carbon dioxide
- Smokey yellow flame
- hydrocarbon + oxygen -> carbon + carbon monoxide + carbon dioxide + energy
- less energy released
14
Q
Alkane
A
Bromine water stays orange
No spare bonds
Saturated
Single bond
