Topic 10 - Equilibrium 1 Flashcards

1
Q

What is dynamic equilibrium?

A

when the forwards and backwards reactions are going at the same rate so the concentrations of the reactants and products remain constant
-occurs in a closed system

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2
Q

What is a closed system?

A

a system where reactants and products can’t leave

-but energy can be transferred between the system and surroundings

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3
Q

What is a homogeneous system?

A

a system where all the substances within the system are in the same state

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4
Q

What is a heterogeneous system?

A

a system where the substances within the system are in different states

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5
Q

What happens when temperature in a system is increased (according to le Chatelier’s principle)?

A

the equilibrium favours the endothermic (+ve ΔH) reaction

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6
Q

What happens when temperature in a system is decreased (according to le Chatelier’s principle)?

A

the equilibrium favours the exothermic (-ve ΔH) reaction

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7
Q

What happens when the concentration of reactants in a system is increased (according to le Chatelier’s principle)?

A

reverse reaction is favoured (equib shifts left)

-no. particles of reactants increase so no. collisions with energy ≥ Ea increases

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8
Q

What happens when the concentration of products in a system is increased (according to le Chatelier’s principle)?

A

forwards reaction is favoured (equib shifts right)

-no. particles of products increase so no. collisions with energy ≥ Ea increases

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9
Q

What happens when the pressure inside a system is increased (according to le Chatelier’s principle)?

A

equilibrium favours side with the least moles of gas (the lower pressure side)

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10
Q

What happens when the pressure inside a system is decreased (according to le Chatelier’s principle)?

A

equilibrium favours side with the most moles of gas (the higher pressure side)

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11
Q

What is the equilibrium constant?

A

K

the measure of quantity of all products compared to all reactants in a system at equilibrium

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12
Q

Kc =

A

[products]
________
[reactants]

-don’t include any solids

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