what is bond energy?
the average energy required to break one mole of a particular covalent bond and to separate to the neutral atoms completely from each other
what is the heat of formation on a substance?
the heat change that takes place when one mole of a compound in its standard state is formed from its elements in their standard states
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what is bond energy?
the average energy required to break one mole of a particular covalent bond and to separate to the neutral atoms completely from each other
what is the heat of formation on a substance?
the heat change that takes place when one mole of a compound in its standard state is formed from its elements in their standard states
what is an exothermic reaction?
a reaction that gives heat out
what is an endothermic reaction?
a reaction that takes heat in
what is the heat of reaction of a substance?
the heat change when the number of moles of reactants indicated in the balanced equation for the reaction react completely
what does ∆H mean?
heat change taking place during a chemical reaction
what does a + ∆H indicate?
endothermic reaction
what does a - ∆H indicate?
exothermic reaction
what is the heat of combustion of a substance?
the heat change when one mole of the substance is completely burned in excess oxygen
how is heat of combustion measured?
with a bomb calorimeter
describe how heat of combustion is measured in a bomb calorimeter?
-measured inside crucible
-bomb filled with excess oxygen under pressure, bomb in water ignited using a coiled wire
what is the formula for heat produced?
∆H = m c ∆θ
what is the kilogram calorific value of a fuel?
the heat energy produced when 1kg of the fuel is completely burned in oxygen