Flashcards in Chemistry3 8E Combustion Deck (21)
What problems does acid rain cause?
- Trees and plants die
- Freshwater animals die
- Damage to buildings and statues
How can we reduce global warming?
Burn less fossil fuels by
- using buses, bicycles and walking
- using UK grown foods which don't have to be transported from the other side of the world.
- buy less new stuff
- recycle glass, plastic and anything else the council will take away.
- eat less beef (fewer cows to fart!)
- wear a jumper rather than turning up the heating on colder days
- turn off lights/ sockets/ devices on standby ( ask parent first!)
Name the gases which make acid rain when they dissolve in clouds.
Sulphur dioxide and Nitrogen oxides.
What causes global warming?
Gases released by the burning of fossil fuels (mainly carbon dioxide) and methane gas.
Name the 3 things needed for a fire to burn.
In any order
What is oxidation?
A reaction where something combines with oxygen.
How can we prevent acid rain?
New cars have to clean up their waste gases with a catalytic converter fixed to their exhaust.
Power stations have been forced to clean up the gases they make before they are released into the air.
Which acid gas is made inside a vehicle engine?
What are the consequences of global warming?
Average world temperatures increase
Polar ice caps and glaciers are melting
Sea levels are rising
More wildfires in forests
More drought or flash floods
More unpredictable and extreme weather conditions
How do you test for water vapour given off in combustion?
Cobalt paper turns from blue to pink
Cobalt chloride crystals go from white to pink when water is added.
What is incomplete combustion?
Any one of
- the fuel only partly reacts with oxygen
- Burning without enough oxygen.
- Soot produced.
- Carbon monoxide made instead of carbon dioxide
What is the fire triangle?
A shape with 3 sides each of which has something needed to keep a fire going.
(It is a model which tries to show that if you take one of the three away the fire will go out.)
What kind of fire should you not put water on?
An electrical fire.
( Use a dry powder or carbon dioxide fire extinguisher instead.)
Why shouldn't you use water on burning oil?
The water turns to steam because the fire is hot. The steam expands and splashes burning oil.
What causes acid rain?
Acid gases given off when fossil fuels are burnt in cars and power stations dissolve in the clouds. The rain that falls is a weak acid.
What is a hydrocarbon?
A substance that contains only hydrogen and carbon.
Say the word equation for the burning/combustion of magnesium in air
Magnesium + oxygen >>> magnesium oxide
What is a fuel?
Something that can be burnt to release hear energy.
What is the law of conservation of mass?
The idea that mass is not gained or lost during a chemical reaction. You can only rearrange the particles you start with to make the products.
How do you test for carbon dioxide given off in combustion?
The best answer has 2 parts to it
- Bubble this gas through limewater.
- The limewater will turns milky/cloudy.