Unit 8E - Combustion Flashcards
What is fuel?
Fuel is a chemical substance from which stored energy can be transferred to make things happen.
How do hydrogen powered vehicles work?
How is the reaction started?
Energy is released from the reaction between hydrogen and oxygen. The reaction must start with energy from a flame or a spark.
What are fossil fuels?
Fossil fuels are fuels that are produced from oil that was formed by living organisms that died many millions of years ago.
What are hydrocarbons?
Hydrocarbons are fuels that contain molecules from carbon and hydrogen.
What happens during combustion?
The carbon and the hydrogen react with the oxygen and produce carbon dioxide.
What is oxidation?
When a substance reacts with oxygen to produce an oxide
What is the law of conservation of mass?
The locom states that mass is never gained or lost during a chemical reaction. No new atoms are created or lost they are simply rearranged to form new substances.
What’s phlogiston?
Phlogiston was a theory that stated: substances contained something called phlogiston that when burned it would escape into the air, explaining why nothing is left behind. However it was proved wrong when scientists measured masses of gases.
What is an exothermic reaction?
An exothermic reaction is a reaction that releases energy in form of heat.
What is the fire triangle?
What are the 3 factors
It is 3 factors that allow combustion to continue.
The 3 factors are: oxygen, fuel , and heat.
Look at hazard symbols
Look at hazard symbols
What should you do to put out burning oil?
To put out burning oil, you should use a foam or a fire blanket to keep oxygen away from the fuel. Water should not be used because it would sink in to the oil, turn into steam and spread the fire.
What would you do to put out an electric fire?
With an electric fire you, firstly you should turn off the mains. Later to put out the flames you should put carbon dioxide on the flames because it is heavier than the air which would push the oxygen away and stop the fire. If water was used you could get a serious electric shock
