Equilibrium 1

QuizÂ by Eric Williams

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10 questions
• Q1
What is chemical equilibrium?
The point at which the concentration of reactants does not change with time
Magic
The point at which the concentrations of both products and reactants do not change with time
The point at which the concentration of products does not change with time
20s
• Q2
The percent reaction of a given chemical reaction is calculated to be ~78%. This reaction would be classified as:
Reactant Favouring
Quantitative
Product Favouring
No reaction
20s
• Q3
In an open system, we have the breakdown of CaCO3 into CaO and CO2 via heat. This reaction is quantitative.
False
True
120s
• Q4
The percent reaction of a given chemical reaction is calculated to be 0.1%. This reaction would be classified as:
Quantitative
Product Favouring
Reactant Favouring
No Reaction
20s
• Q5
The theoretical concentration of product of a reaction going to completion is 3.0 mol/L, but we only receive 2.3 mol/L. What is the percent reaction?
50%
76%
77%
82%
45s
• Q6
The equilibrium constant "K" is related to what ratio?
Products to reactants
Products to volume
Pressure to reactants
30s
• Q7
In the above reaction at equilibrium, we have the following concentrations: [A]=4.0 mol/L, [B]=1.5 mol/L, [C]=2.5 mol/L, [D]=3.5 mol/L. What is the equilibrium constant?
3.3 x 10^-2
29.8
3.0x10
30
120s
• Q8
We have a reaction that has reached equilibrium, and the concentration of the reactants and products are 2.6 mol/L and 0.4 mol/L respectively. What is the equilibrium constant of the reaction?
7.0
0.2
0.15
6.5
45s
• Q9
We have calculated the equilibrium constant of a reaction to be 2.6x10^4. We can say that this reaction is:
Quantitative
Slow
Reactant favouring
Fast
45s
• Q10
The equilibrium law is expressed in what formula?
K=[Products]/[Reactants]
K=Temperature/Volume
q=mc(dT)
K=PV
45s

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