Energy Flashcards
what is an endothermic reaction?
bond breaking reaction
what is an exothermic reaction?
bond making reaction
how do we decide if a reaction is endo or exothermic?
the amount of energy made and produced need to be compared
what is it if more energy is released than needed?
exothermic
what is it if more energy is needed than relesed?
endothermic
what is the equation for energy transferred?
m x c x triangle t
how do you find out the energy released by 1 g of solid fuel?
measure out the mass of 1g of fuel
pour 100g of water into a copper calorimeter
heat the water with the burning fuel
measure temperature rise
repeat with different fuels to ensure fair testing
ensure reliability by repeating results
how do you calculate the energy in a gram of fuel ?
energy released (J) mass of fuel burnt (G)
what happens in endothermic reactions?
take in energy from the surroundings (absorb energy)
what happens in exothermic reactions>
give out energy to surroundings (release energy)
if the temperature goes up it is a ?
exothermic reaction
if the temperature goes down it is an?
endothermic reaction
what reaction is photosyntheses?
endothermic reaction
what reaction is combustion?
exothermic reaction
what is the equation for this using ethanol?
ethanol +oxygen— carbon dioxide + water
