National 3 Unit 2 Natures Chemistry What is a fuel A fuel is a substance that can be burned to release energy The Fire T riangle A fire needs 3 things in order to keep burning ID: 597715
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Slide1
Fuels and Energy
National 3 Unit 2 – Nature’s ChemistrySlide2
What is a fuel?
A fuel is a substance that can be
burned
to release energySlide3
The Fire T
riangle
A fire needs
3 things
in order to keep burning:
If the fire is starved of one or more of these it will go out.Slide4
Fire Extinguishers
Different fire extinguishers are used for different fuel sources.
Video
Slide5
Combustion
Fuels containing
only carbon and hydrogen
atoms are known as hydrocarbons.
When a hydrocarbon burns it is known as
combustion
.
Hydrocarbon + oxygen carbon dioxide + water
You can test for the production of carbon dioxide using lime water:
Carbon dioxide turns lime water cloudySlide6
Different Fuels
Here are some different fuels with some advantages and disadvantages:
Fuel
Advantage
Disadvantage
Petrol
Provides a lot of energy
It is
a finite resource- it will eventually run out
Alcohol
It
is renewable – can be remade
Need a lot of landmass
to make it
Biomass
It
is renewable – can be remade
It is expensive to make themSlide7
Everyday Consumer Products
National 3 Unit 2 – Nature’s ChemistrySlide8
Plants
Plants (producers) are the first source of energy in all food chains.
They change light energy from the sun into chemical energy that animals (consumers) can use.Slide9
Fertilisers
Fertilisers are chemicals that are used to help plants grow.
They contain minerals that the plant needs in order to grow into a big, healthy plant. Slide10
Food from Plants
Plants make and store food in the form of
starch
.We know this because when
iodine solution
is placed on a leaf, it turns a
blue/black colour
Test for starch:
Iodine solution turns from
brown
to
blue/blackSlide11
Alcohol from Plants
Some plants can be used to make
alcohol
by fermentation.
Fermented Plant
Alcohol Produced
Grapes
Wine
Potatoes
Vodka
Apples
CiderSlide12
Harmful Effects of Alcohol
Alcohol can damage the body in the following ways:Slide13
Plants to Products
National 3 Unit 2 – Nature’s ChemistrySlide14
Products from Plants
Plants can be used to make products we use daily
Plant
Product
Poppy
Morphine
Flax
Linen
Aloe Vera
Moisturising cream
Lemon
Shampoo
Lavender
Soap
Peppermint
Mouthwash