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WorksheetsExam buster module 3
Total questions: 15
Worksheet time: 30mins
Which of the following statements are incorrect regarding Le Chatelier’s Principle?
If a system in equilibrium has part of its products removed, the equilibrium will shift towards the reactants.
If a closed system in equilibrium has its pressure increased, the equilibrium will favour the side of the chemical equation with the least molecules
If the temperature is increased during an exothermic reaction in equilibrium, the reaction will go on to produce more reactants
a. None of the above.
What is the conjugate acid of HCO3-?
CO2
CO32-
H2CO3
H+
The what is the concentration of aqueous KOH that has a pH of 12.7?
0.05M
5.0 x 10-3 M
2.0 x 10-13 M
0.13M
True or False: a Kc larger than 1 indicates that the equilibrium favours a higher concentration of reactants.
True
False
You forget to bring water to uni so you sneak into the chem labs and synthesise 10 moles of H2O, 2 moles of H2 and 1 mole of O2 remain in the bottle at equilibrium. Assuming the temperature and pressure remain constant, what is the Kc of this reaction?
100
5
0.04
25
What would the rate law for 2H2 + O2 -> 2H2O be
k2[H2]m [O2]n
k[H2]2 [O2]
k[H2]m [O2]n
There is not enough information to answer this
Which of the following effects the rate of a reaction?
The presence of a catalyst
The time of day
The season
All of the above
The following data is from the reaction 2R + S -> T + U. What is the rate law for this?
Rate = k([R]2 + [S])
Rate = k[2R] [S]
Rate = k[R]2 [S]2
Rate = k[R]2 [S]
Which is true for a galvanic cell?
Oxidation occurs at the cathode
Electrons flow from the cathode to the anode
Electrons are conducted through the salt bridge
Ecell > 0V
Water reacts with carbon dioxide to produce bicarbonate. You start with 0.5 moles of both reactants and at equilibrium you have 0.4 moles of both. Would the reaction favour the products or reactants? H2O + CO2 -> H2CO3
Products
Reactants
Neither
There is not enough information to tell
If the equilibrium constant is greater than 1
There is more reactants than products
There is more products than reactants
There is equal amounts of products and reactants
The reaction cannot proceed
Which element is being oxidised in the following reaction: Cu + 2Ag+ -> Cu2+ + 2Ag
Cu
Ag
Both
Neither
Using the following information:
F = 96,500 Cmol-1
2Au3+ (aq) + 6e- ->2Au(s) E° = + 1.50 V
3Ni2+ (aq) + 6e- -> 3Ni(s) E° = - 0.23 V
The value of ΔGo (at 25oC) for the reaction is?
1.23 x 105
1.7 x 105
-3.3 x 105
-1 x 106
The standard cell potential Eocell of the silver-copper galvanic cell has a value of 0.46V. The cell reaction is 2Ag+ (aq) + Cu(s) -> 2Ag (s) + Cu2+ (aq) and standard oxidation potential of copper half-cell is 0.34 V. What is the standard potential for silver half-cell?
0.12V
-0.34V
0.80V
0.16V
What is the oxidation number of Al in AlF3?
0
+2
-2
+3
