JAMB UTME - Chemistry - 1989
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The above graph shows a typical heating curve from the solid phase through the liquid phase to the gaseous phase of a substance. Which part of the curve shows solid and liquid in equilibrium?
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The combustion of ethene, \( \mathrm{C_2H_4} \), is given by the equation \( \mathrm{C_2H_4 + 3O_2 \rightarrow 2CO_2 + 2H_2O} \); ∆H = - 1428 KJ. If the molar heats of formation of water and carbon (IV) oxide are - 286 kJ and - 396 kJ respectively, calculate the molar heat of formation of ethene in KJ
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Use the figure above to answer this question. Which of the following compounds is an isomer of the compound
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Use the figure above to answer this question. Which of the following is NOT a monomer?
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If in the graph above 1 dm3 of a saturated solution of KCL is cooled from 80oC, the mass of crystals deposited will be [K = 39, Cl = 35.5]
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What is the IUPAC name for the compound?
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Which of the following reactions is (are) feasible?
I Br(1) + 2CI2(aq) 2Br(aq) + CI2(g)
Ll 21(aq) + Br2(1) 2Br(aq) + 12(s)
Lll 2F(aq) + CI2(g) 2CI(aq) + F2(g)
IV 2F(aq) + Br2(1) 2Br(aq) + F2(g)
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It can be deduced from the vapour pressure curves above that
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The molar ratio of carbon to hydrogen of a volatile liquid compound is 1: 2. 0. 12 g of the liquid on evaporation at s.t.p. gave 32 cm3 of vapour. The molecular formula of the liquid is
[G.M.V =22.4 dm 3, C = 12, H = 1]
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Valency of X is 2
Element Y1s22s22p63s23P1
valency of Y is 3
There is an exchange of valency when a compound is being formed. Hence, we have Y2X3
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The same current is passed for the same time through solutions of AgNO3 and CuSO4 connected in series. How much silver will be deposited if 1.0 g of copper is produced?
[Cu = 63.5, S = 32, O = 16, Ag = 108, N = 14]
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Mass of silver depositedMass of copper deposited = Equivalent mass of silverEquivalent mass of copper
Mass of silver deposited1.0g = 10863.5
= 31.75g
Copper is devalent = Cu2+
Mass of silver deposited = 108g31.75g
= 3.30g
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\(\mathrm{CO}_{g} + \mathrm{H_2O}_{g} \rightarrow 2_{g} + \mathrm{H_2}_{g}\ \Delta H = -4100\text{J}\). Which of the following factors favour the formation of hydrogen in the above reaction? i. high pressure. ii. low pressure iii. high temperature iv. use of excess steam
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The above diagram gives the potential energy profile of the catalyst and uncatalysed reactions of X(g) + Y(g) → XY(g). Deduce the respective activation energies in KJ of the catalysed and uncatalysed reverse reactions: XY(g) → X(g) + Y(g)
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Question 49 Report
Which of the curves in the above graph illustrates the behaviour of an ideal gas?
