彻舷栖涤暴傅纳梧炊蹬蘑袖匪
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起止时间:2020-12-08到2021-04-30
更新状态:已完结
Solutions and Colloids Unit test
1、 There are four water solutions of the equal volume in which there are equal mass of glucose(M=180), CaCl2(M=111), NaHCO3 (M=84)and urea(M=60) respectively. The order of boiling-point of these solutions is?
A:glucose
B:sucrose
C:CaCl2
D:NaHCO3
答案: NaHCO3
2、 The values of the vapor pressure lowering,boiling point elevation, freezing point depression of nonelectrolyte depend on
A:the volume of the solution
B:the nature of the solute
C:the molality of the solute in the solution
D:the temperature of the solution
答案: the molality of the solute in the solution
3、 Which of the following shows Tyndall effect?
A:Colloids
B:True Solution
C:Suspension
D:no answer here
答案: Colloids
4、 There are four water solutions of the equal volume in which there are equal mass of glucose(M=180), CaCl2(M=111), NaHCO3 (M=84)and urea(M=60) respectively. The order of boiling-point of these solutions is?
A:urea > glucose> NaHCO3>CaCl2
B:urea >glucose >CaCl2 >NaHCO3
C:NaHCO3 >CaCl2 >glucose >urea
D:CaCl2> NaHCO3>urea> glucose
答案: CaCl2> NaHCO3>urea> glucose
5、 Colloidal AgI particles are prepared by mixing same volume 0.006 mol·L-1 KI and 0.01 mol·L-1 AgNO3 solution. Which of the following would be most effective in coagulating such a colloidal AgI
A:K2SO4
B:K3PO4
C:KCl
D:KNO3
答案: K3PO4
6、 when NaCl is sprinkled on grass, the grass withers and dies. This occurs because of the poisonous nature of NaCl.
A:正确
B:错误
答案: 错误
7、 Colligative properties do not depend on nature of solute particles.
A:正确
B:错误
答案: 正确
8、 When an electrolyte is added to a colloidal solution, the ions of the electrolyte may cancel the charge on the colloidal particles and render them electrically neutral.
A:正确
B:错误
答案: 正确
9、 Colloidal Solution is a heterogeneous mixture in which particle size of substance is intermediate of true solution and suspension.
A:正确
B:错误
答案: 正确
10、 Colloids show some unique properties like Tyndall Effect, Brownian Movement, Electrophoresis & Electro Osmosis.
A:正确
B:错误
答案: 正确
The Energy and Direction of a Chemical Reactions Unit test
1、 Which of the following is NOT a state function of a system ?
A:internal energy
B:enthalpy
C: heat
D:entropy
答案: heat
2、 what system can exchange heat and work, but not matter, with its surroundings?
A:Closed system
B:Open system
C:Isolated system
D:none of those
答案: Closed system
3、 Which choice listed blow has the standard enthalpy of formation being zero
A:I2(g)
B:I2(s)
C:Br2(g)
D:NH3(g)
答案: I2(s)
4、 A reaction cannot proceed spontaneously at 298K, but it can proceed spontaneously at 1245K . So the reaction could meet
A:
B:
C:
D:
答案:
5、 
A:CCl4 (g) +2H2O (g) =CO2 (g) + 4HCl (g)
B:CaO (s) +CO2 (g) =CaCO3 (s)
C:Cu2+ (aq) + Zn (s) =Cu (s) + Zn2+ (aq)
D:Na (s) +H2O (l) =Na+(aq)+½H2 (g)+OH－(aq)
答案: Cu2+ (aq) + Zn (s) =Cu (s) + Zn2+ (aq)
6、 Exothermic refers to a transformation in which a system releases energy (heat) to the surroundings.
A:正确
B:错误
答案: 正确
7、 Standard enthalpy of combustion is defined as the enthalpy change observed in a constituent thermodynamic system when 1 mole of a substance reacts completely with oxygen under standard conditions
A:正确
B:错误
答案: 正确
8、 Standard enthalpy change of formation is defined as the enthalpy change observed in a constituent thermodynamic system when one mole of a compound is formed from its elementary antecedents under standard conditions.
A:正确
B:错误
答案: 正确
9、 The enthalpy change of any reaction under any conditions can be computed, given the standard enthalpy change of formation of all of the reactants and products.
A:正确
B:错误
答案: 正确
10、 Hess’ Law is used to predict the enthalpy change regardless of the path through which it is to be determined.
A:正确
B:错误
答案: 正确
The Rate and Limitation of Chemical Reactions Unit test
1、 Factor affecting the speed of reaction does not include
A:Temperature
B: concentration
C:catalyst
D:volume
答案: volume
2、 For the reaction A+2B →D+2E, the rate equation is rate = k[A][B]2 , then it is
A: Doubled when [A] is doubled keeping B constant
B:Doubled when [B] is doubled keeping A constant
C:the overall order being 2
D:elementary reaction
答案: Doubled when [A] is doubled keeping B constant
3、 If the concentration of the reactants is decreased, the rate of reaction
A:Will increase
B:will remain unaffected
C:will decrease
D:cannot be determined
答案: will decrease
4、 Which choice listed below is wrong when we talk about the order of reaction
A: The order of reaction can be a fraction.
B:The order of reaction can be a positive integer.
C:The order of reaction only can be ascertained by experiment.
D:The order of reaction can be a negative number.
答案: The order of reaction only can be ascertained by experiment.
5、 If the reaction of 2A+B → C is a elementary reaction, which choice listed below is true?
A:it is a second order reaction
B:it is a slow reaction
C:it is a second order reaction to B
D:it is a second order reaction to A
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