Re-take Quiz (Mid-Term Syllabus Content)

Quiz
•
Chemistry
•
12th Grade
•
Easy
Jahrukh Tariq
Used 1+ times
FREE Resource
12 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
3 mins • 3 pts
Fill in the blanks appropriately to answer the given question correctly:
Question: The solubility of the Group II sulfates decreases down the group. Explain this trend.
Answer: ΔHlatt and ΔHhyd both 1 , ΔHlatt 2 by a 3 extent and ΔHhyd 2 by a 4 , ultimately ΔHsol becomes 5 exothermic or 5 negative.
1 = decrease
2 = decrease
3 = small
4 = large
5 = less
1 = decrease
2 = decrease
3 = large
4 = small
5 = less
1 = increase
2 = increase
3 = small
4 = large
5 = more
1 = increase
2 = increase
3 = large
4 = small
5 = more
Answer explanation
Answer Explanation
2.
MULTIPLE CHOICE QUESTION
3 mins • 3 pts
Calculate the solubility of BaSO4 in g per 100 cm3 of solution.
Mr of BaSO4 is 233.4
2.34 x 10-4 g per 100 cm3 of solution
2.34 x 10-5 g per 100 cm3 of solution
2.34 x 10-3 g per 100 cm3 of solution
1.08 x 10-3 g per 100 cm3 of solution
Answer explanation
Answer Explanation
3.
MULTIPLE CHOICE QUESTION
3 mins • 3 pts
Calculate standard enthalpy change of formation in kJ/mol.
ΔHΘf of SO42-= -652 kJ.mol-1
ΔHΘf of SO42-= -552 kJ.mol-1
ΔHΘf of SO42-= -752 kJ.mol-1
ΔHΘf of SO42-= -852 kJ.mol-1
Answer explanation
Answer Explanation
4.
MULTIPLE CHOICE QUESTION
3 mins • 3 pts
The lattice energy of BaSO4(s) is greater than/more negative than the lattice energy of Cs2SO4(s). Choose the correct explanation for it.
1. Ba2+ ion is smaller than Cs+
2. Ba2+ ion has a larger charge than Cs+
3. Stronger force of attraction between the SO42- ions for Ba2+ than Cs+
1. Ba2+ ion is larger than Cs+
2. Ba2+ ion has a larger charge than Cs+
3. Stronger force of attraction between the SO42- ions for Ba2+ than Cs+
1. Ba2+ ion is smaller than Cs+
2. Ba2+ ion has a smaller charge density than Cs+
3. Stronger force of attraction between the SO42- ions for Ba2+ than Cs+
1. Ba2+ ion is smaller than Cs+
2. Ba2+ ion has a larger charge than Cs+
3. Less strong force of attraction between the SO42- ions for Ba2+ than Cs+
Answer explanation
Answer Explanation
5.
MULTIPLE CHOICE QUESTION
3 mins • 3 pts
Calculate the minimum temperature at the which this becomes feasible.
T = -58.7 ₒ C
T = 58.7 ₒ C
T = -38.7 ₒ C
T = 38.7 ₒ C
Answer explanation
Answer Explanation
6.
MULTIPLE CHOICE QUESTION
3 mins • 3 pts
Calculate the standard Gibbs free energy change for this reaction
at 25 ο C.
ΔG = ΔH - TΔS
ΔGθ = -24.9 kJ.mol-1
ΔGθ = 24.9 kJ.mol-1
ΔGθ = -29.9 kJ.mol-1
ΔGθ = 29.9 kJ.mol-1
Answer explanation
Answer Explanation
7.
MULTIPLE CHOICE QUESTION
3 mins • 3 pts
Determine the rate of reaction at 40s.
Rate = 0.000000170
Rate = 0.000170
Rate = 0.0000170
Rate = 0.00170
Answer explanation
Answer Explanation
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