chapter 9 chemsitry

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what is activation energy
the minimum energy required for a reaction to take place
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equation for enthalpy change
H(products)-H(reactants)
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exothermic BENDO MEXO
energy is relesed as heat into the surroundings (-)
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endothermic
energy is taken in from the surroundings (+)
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standard conditions
pressure =100KPa temperature = 298K (+173 from celcius) concentration= 1 mol dm^-3
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what is standard enthalpy change of a reaction
enthalpy change that accompanies a reaction in the molar quantities shown in a chemical equation under standard conditions, with all reactants and products in their standard states
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what is conservation of energy
energy is not created or destroyed, when a chemical reaction involving enthalpy takes place, heat is transferred between the system and the surroundings as energy
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what is enthalpy change of formation
takes place when one mole of a compound is formed from its elements under standard conditions, with all reactants and products in their standard states A= -B+C
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what is specific heat capacity
energy required to raise the temperature of a 1g substance by 1K, water = 4.18, q=mc (delta)t
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what is enthalpy change of neutralisation
energy change in the reaction of an acid by a base to form one mole of H20 under standard conditions
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Hess' law
if a reaction can take place by 2 routes and has the same start/finish conditions, enthalpy change is the same
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what is average bond enthalpy
energy required to break one mole of a specified type of bond in a gaseous molecule, always endothermic
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what is enthalpy change of combustion
one mole of a substance reacts completely with oxygen under standard conditions, less exo if there is heat loss, incomplete combustion or evaporation of the combustable, more exo if there are non standard conditions A=B-C
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Other cards in this set

Card 2

Front

equation for enthalpy change

Back

H(products)-H(reactants)

Card 3

Front

exothermic BENDO MEXO

Back

Preview of the front of card 3

Card 4

Front

endothermic

Back

Preview of the front of card 4

Card 5

Front

standard conditions

Back

Preview of the front of card 5
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