energy from fuels 2.3 Flashcards
what is a fuel
a substance that produces energy
what is combustion
a substance burns to react with oxygen
what type of reaction is combustion
exothermic
what is in the fire triangle
oxygen, fuel and heat
the types of combustion
blue flame and yellow flame
what happens in blue flame combustion
nothing happens
what happens in yellow flame combustion
the test tube turns black
complete combustion
CH4 + O2 —> CO2 + H2O
what happens when a hydrocarbon burns in lots of oxygen
carbon dioxide and water is produced
incomplete combustion
CH4 + O2 —> CO + C
what happens when a hydrocarbon burns in very little oxygen
carbon monoxide and carbon are produced
what turns limewater cloudy
carbon dioxide
when water is present what happens to cobalt chloride paper
it turns from blue to pink
what is the difference between the endothermic reactions and exothermic reactions
an exothermic reaction is one that gives out heat energy to its surroundings and an endothermic reaction is one that absorbs heat energy from the surroundings
