Chapter 9 - Enthalpy Flashcards

1
Q

Enthalpy

A

➜ a measure of heat energy in a chemical system at constant pressure

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2
Q

law of conservation of energy

A

➜ energy cannot be created or destroyed

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3
Q

Exothermic

A

➜ energy is released into the surroundings

➜ △H is NEGATIVE

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4
Q

Endothermic

A

➜ energy is taken in from surroundings

➜ △H is POSITIVE

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5
Q

Standard conditions

A

➜ standard pressure = 101kPa
➜ standard temp = 25°C (298K)
➜ standard conc = 1 mol dm⁻³

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6
Q

q = mc△t

A
q = energy (J)
m = mass (g)
C = specific heat capacity ( 4.18)
△t = change in temp
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7
Q

Average bond enthalpy

A

➜ the energy required to break one mole of specified type of bond in a gaseous molecule

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8
Q

Hess’ Law

A

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

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