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WorksheetsХимийн шалгалт
Total questions: 21
Worksheet time: 16mins
Тайлагдсан уусмал үүсгэх хослолыг тодорхойлно уу.
A. CH3COOH/ CH3COO-, HCl/H+, HF/F-
B. HNO3/H+, CH3COOH/CH3COO-, NH4OH/NH4+
C. HCl/H+, HF/F-, HNO3/H+
D. HF/F-, NH4OH/NH4+, CH3COOH/ CH3COO-
Which statement about the reaction involving the hydrated aluminum ion is true?
A. H2O and [Al(H2O)5OH]2+ are a conjugate acid-base pair.
B. H2O acts as an acid by donating H+.
C. If OH- is added to the system, equilibrium will shift to the right.
D. The pH will change depending on the conditions.
Using the given information, calculate the change in standard Gibbs energy for the reaction and predict whether it will occur spontaneously under standard conditions.
A. 70.54 kJ/mol, will occur spontaneously
B. -70.54 kJ/mol, will not occur spontaneously
C. -70.54 kJ/mol, will occur spontaneously
D. 70.54 kJ/mol, will not occur spontaneously
Arrange the following compounds in order of decreasing reactivity in a thermal reaction.
A. b,a,d,c,e
B. a,b,d,c,e
C. e,d,c,b,a
D. d,c,a,e,b
E. d,e,a,c,b
For the galvanic cell using the half-cells Fe/Fe2+ (1M) and Pb/Pb2+ (1M): Fe2+ + 2e- = Fe 0.44V, Pb2+ + 2e- = Pb -0.13V, which of the following statements is correct?
A. The mass of the iron electrode will increase as the cell operates.
B. Electrons released from the lead electrode will flow through the external circuit.
C. The concentration of Pb2+ ions will increase as the cell operates.
D. The iron electrode will act as the anode.
E. The concentration of Pb2+ ions will become zero when the cell is fully discharged.
What reaction is used to produce a rubber with high durability?
A. polymerization
B. polycondensation
C. ring-opening polymerization
D. addition
The blue color of cobalt chloride paper is associated with the ion [CoCl4]2-. What oxidation state does cobalt exhibit in this complex ion?
What oxidation state does cobalt exhibit in the complex ion [CoCl4]2-?
Oxidation state +2
Oxidation state +3
Oxidation state -2
Oxidation state +2
What explains that primary amines exhibit stronger basicity than ammonia?
The nitrogen atom has lone pairs of electrons not involved in chemical bonding.
Radicals of saturated hydrocarbons exert a push of electron pairs towards the nitrogen atom.
The bond strength of N-H decreases.
The polarity of the C-N bond decreases.
Calculate the number of atoms in 12.25L of hydrogen sulfide (H2S) at standard temperature and pressure.
4.5*10^23
6*10^23
9*10^23
12*10^23
What will be the volume of gas when the pressure is reduced from 2.4dm3 to 0.4atm?
12
10
8
6
What is the standard potential E0 of the galvanic cell with the half-reactions Ni(s)|Ni+(aq) and Ag+(aq)|Ag(s)?
-1.83V
0.57V
0.9V
1.04V
Calculate the amount of sodium hydroxide produced from the electrolysis of 5.85g of salt solution.
16g
8g
4g
2g
1g
For the galvanic cell using the half-cells Fe/Fe2+ (1M) and Pb/Pb2+ (1M), which statement is correct?
The mass of the iron electrode increases during the operation of the cell.
Electrons released from the lead electrode will flow through the external circuit.
The concentration of Pb2+ ions will increase during the operation of the cell.
The iron electrode will act as the anode.
The concentration of Pb2+ ions will become zero when the cell is fully discharged.
Using the given information, calculate the standard Gibbs free energy of the reaction.
Calculate the change in standard Gibbs energy of the reaction and predict whether the reaction will occur spontaneously under standard conditions.
70.54 kJ/mol, will occur spontaneously
-70.54 kJ/mol, will not occur spontaneously
-70.54 kJ/mol, will occur spontaneously
70.54 kJ/mol, will not occur spontaneously
Calculate the heat of the reaction 2Na(s) + 1/2O2(g) = Na2O(s) + Q using the given data.
-21.2 kcal
39.3 kcal
146.1 kcal
175.9 kcal
282.7 kcal
Express the solubility product of silver phosphate (Ag3PO4) in terms of the solubility (S).
Ksp = [Ag+]^3[PO4^3-] = S^4
Ksp = [Ag+]^3[PO4^3-] = 3S^4
Ksp = [Ag+]^3[PO4^3-] = 9S^4
Ksp = [Ag+]^3[PO4^3-] = 27S^4
What role does the carbonate ion play in the reaction when ammonium carbonate decomposes upon gentle heating?
Brønsted-Lowry acid
Brønsted-Lowry base
Oxidizer
Reducing agent
Which of the following substances is a protein?
Rubber
Starch
Insulin
Fiber
How much oxygen is required to burn 1m3 of natural gas containing 95% methane (the remainder is nitrogen)?
2.0 m3
1.9 m3
3.8 m3
0.95 m3
5.0 m3
