JAMB UTME - Chemistry - 2000
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The diagram above is the solubility curve of a solute, X. Find the amount of X deposited when 500cm3 of a solution of X is cooled from 60oC to 20oC.
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0.46g of ethanol when burned raised the temperature of 50g of water by 14.3K. Calculate the heat of combustion of ethanol.
[C = 12, O = 16, H = 1, Specific heat capacity of water = 4.2 jg-1K-1]
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= -50 * 4.2 * 14.3
= -300 KJ mol-1
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MnO4(aq) + 8H+(aq) + Y → Mn2+(aq) + 4H2O(l)
Y in the equation above represents
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(1/2)Zn2+(aq) + e- → (1/2) Zn(s)
In the reaction above, calculate the quantity of electricity required to discharge zinc.
[F = 96 500 C mol-1]
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Use the option above to answer this question. The graph that describes a zero order reaction is
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50cm of carbon (II) oxide exploded with 150cm\(^{3}\) of air containing 20% oxygen by volume. Which of the reactants was in excess?
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50cm3 → 25cm3
20% × 150cm3
30cm3 is the volume of oxygen available for the reactions.
But only 25cm3 is required, therefore O2 is in excess.
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N2(g) + O2(g) ↔ 2NO(g); ΔH = + 180.6 kJ mol-1
In the reaction above, increase in temperature will
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The ratio of the initial to the final pressure of a given mass of gas is 1:1.5. Calculate the final volume of the gas if the initial volume was \(3000\text{cm}^3\) at the same temperature
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The shapes of CO\( _2 \), H\( _2 \)O and CH\( _4 \) respectively are
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HCL(aq) + H2O(l) H3O+(aq) + Cl-(aq)
In the reaction above, Cl-(aq) is the
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= -log[-0.3979 + 1]
= 13.40
