Uploaded by Radhika Kapoor

Equilibrium WORKSHEET

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Name
Class : 10
Topic : Reversible Reactions and
Chemical equilibrium
Remark
1
Date
Equilibrium exists when the rate of the forward reaction equals the rate of the reverse reaction.
Equilibrium Reaction:H2 (g) + I2 (g)
2 HI (g)
Forward Reaction: H2(g) + I2(g)  2 HI (g)
Reverse Reaction: 2HI(g)  H2(g) + I2(g)
VERY IMPORTANT: Equilibrium DOES NOT MEAN that there is the same amount of reactants and products.
A dynamic equilibrium means that the amounts of reactant and products are staying constant even though
the reaction is still going.
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1: What is a reversible reaction?
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2: How can the direction of a reversible reaction be changed?
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3. Complete the sentences in regard to distribution of energy in reversible reactions.
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If a reversible reaction is ……………………………………in one direction, it is
………………………………….. in the other.
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The …………………………………… amount of energy is transferred in each case.
4.If a reversible reaction occurs in apparatus which prevents the escape of reactants and
products, when would equilibrium be reached?
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5.If a system is at equilibrium and a change is made to any of the conditions, how does the
system respond?
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6.Is the following statement true or false?
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Even if the concentration of one of the reactants or products is changed, the system
remains at equilibrium. True/False
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Explain your answer.
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7.Complete the tables using the information in the boxes.
8.For gaseous reactions at equilibrium, complete the following sentences.
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An ………………………….in pressure causes the equilibrium position to shift towards the
side with the……………………… number of molecules.

A ……………………………. in pressure causes the equilibrium position to shift towards the
side with the …………………….. number of molecules.
9. 2SO2(g) + O2(g)
∆H = - 197 kJ/mol
2SO3(g)
Describe the effect on the position of equilibrium of changing the conditions specified:
Decreasing the pressure:
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Decreasing the temperature:
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Adding extra oxygen gas:
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10.
(a) What do you understand by the term equilibrium ?
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(b) When the equilibrium mixture is heated, it becomes darker brown in colour.
Suggest if the reverse reaction is endothermic or exothermic. Give a reason for your
choice.
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(c) The pressure on the equilibrium mixture is deceased.
(i)
How will it affect the position of equilibrium. State the reason for your choice.
Equilibrium Shifts to ……………………………..
Reason
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(ii)
Describe what will you observe ?
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11.
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12a.
12b. When 2.5000 g of an oxide of mercury, (HgxOy) is decomposed into the elements by
heating, 2.405 g of mercury are produced. Calculate the empirical formula .
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