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Chemistry > enthalpy changes > Flashcards

enthalpy changes Flashcards

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1
Q

what is enthalpy

A

measure of the heat energy in a chemical system or energy stored within bonds

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2
Q

what is activation energy

A

energy input required to break bonds, minimum energy required for a reaction to take place

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3
Q

what is the standard pressure

A

100kPa

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4
Q

what is standard temperature

A

stated or 298K (25°C)

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5
Q

what is the standard concentration

A

1mol/dm³

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6
Q

what is the standard enthalpy change of reaction

A

enthalpy change of a reaction in the molar quantities shown in an equation under standard conditions and all reactants and products in standard states

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7
Q

what is enthalpy change of formation

A

enthalpy change that takes place when 1 mole of a compound is formed from its elements under standard conditions

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8
Q

what is enthalpy change of combustion

A

1 mole of substance reacts completely with oxygen under standard conditions

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9
Q

what is enthalpy change of neutralisation

A

reaction of an acid by a base to form 1 mole of H2O under standard conditions

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10
Q

what is energy change of surroundings calculated from

A

mass, specific heat capacity, temperature change

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11
Q

what is the specific heat capacity of water

A

4.18J/g/K

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12
Q

what is the equation for energy change

A

q = mc × temp change

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13
Q

what is average bond enthalpy

A

energy required to break 1 mole of a specified type of bond in a gaseous molecule

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14
Q

is bond breaking endothermic or exothermic

A

endothermic, energy is required to break bonds

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15
Q

is bond making endothermic or exothermic

A

exothermic, energy is released when bonds form

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16
Q

what is hess’ law

A

if a reaction can take place by 2 routes and the starting and finishing conditions are the same, the total energy change is the same for each route

17
Q

what is the equation used to calculate enthalpy change from enthalpy changes of formation

A

products - reactants

18
Q

what is the equation used to calculate enthalpy change from enthalpy changes of combustion

A

reactants - products

Chemistry (9 decks)

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