Thermochemistry

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what is bond energy?

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the average energy required to break one mole of a particular covalent bond and to separate to the neutral atoms completely from each other

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what is the heat of formation on a substance?

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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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13 Terms

1
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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

2
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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

3
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what is an exothermic reaction?

a reaction that gives heat out

4
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what is an endothermic reaction?

a reaction that takes heat in

5
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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

6
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what does ∆H mean?

heat change taking place during a chemical reaction

7
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what does a + ∆H indicate?

endothermic reaction

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what does a - ∆H indicate?

exothermic reaction

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what is the heat of combustion of a substance?

the heat change when one mole of the substance is completely burned in excess oxygen

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how is heat of combustion measured?

with a bomb calorimeter

11
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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

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what is the formula for heat produced?

∆H = m c θ

13
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what is the kilogram calorific value of a fuel?

the heat energy produced when 1kg of the fuel is completely burned in oxygen