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Chemistry (Physical) > Energetics > Flashcards

Energetics Flashcards

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1
Q

What is the definition of enthalpy change

A

The heat energy change measured under conditions of constant pressure

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2
Q

What symbol and letter denote enthalpy change

A

∆H

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3
Q

What are standard conditions

A

298K and 100kPa

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4
Q

How do you convert from Celsius to Kelvin

A

+ 273

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5
Q

What is on the Y axis of an exo/endo reaction profile

A

Enthalpy

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6
Q

What is on the X axis of an exo/endo reaction profile

A

Progress of reaction

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7
Q

Draw an exothermic reaction profile

A

-

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8
Q

Draw an endothermic reaction profile

A

-

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9
Q

What is the value of ∆H in an exothermic reaction

A

∆H is negative

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10
Q

What is the value of ∆H in an endothermic reaction

A

∆H is positive

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11
Q

What happens to the temperature of a solution in an exothermic reaction

A

Temperature of solution increases

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12
Q

What happens to the temperature of a solution in an endothermic reaction

A

Temperature of solution increases

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13
Q

Describe the transfer of heat in an exothermic reaction

A

Heat transferred from system to surroundings

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14
Q

Describe the transfer of heat in an endothermic reaction

A

Heat transferred from surroundings to system

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15
Q

Is bond breaking exo or endo?

A

Bond breaking is endothermic

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16
Q

Is bond formation exo or endo?

A

Bond formation is exothermic

17
Q

What is Hess’s law

A

The enthalpy change at constant pressure is independent of the route taken

18
Q

What is enthalpy change of formation

A

When 1mol of a substance is formed from its elements with all reactants and products & in their standard states, under standard conditions

19
Q

What is standard enthalpy of combustion

A

Enthalpy change when 1mol of a substance is burned completely in oxygen, with all reactants and products & in their standard states, under standard conditions

20
Q

What is mean bond enthalpy

A

Enthalpy required to break a covalent bond averaged over a range of different molecules

21
Q

Which factor must stay the same in a formation reaction

A

We cannot change the moles of the product, it must always be 1

22
Q

Which factor must stay the same in a combustion reaction

A

We cannot change the moles of the reactant undergoing combustion, it must always be 1

23
Q

What is the equation for heat energy

A

q = mc∆T

24
Q

What is the equation for enthalpy change

A

∆H = q/n (q is energy, n is moles)

Chemistry (Physical) (8 decks)

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