JAMB UTME - Chemistry - 1998
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\(\mathrm{Mg}^{2+}_{\mathrm{(aq)}} + 2e^- >_{\mathrm{(aq)}} \rightarrow \mathrm{Mg}_{\mathrm{(s)}} E^\circ_{\mathrm{(volts)}} = 2.370\)
\(\mathrm{Zn}^{2+}_{\mathrm{(aq)}} + 2e^- >_{\mathrm{(aq)}} \rightarrow \mathrm{Zn}_{\mathrm{(s)}} E^\circ_{\mathrm{(volts)}} = -0.763\)
\(\mathrm{Cds}^{2+}_{\mathrm{(aq)}} + 2e^- >_{\mathrm{(aq)}} \rightarrow \mathrm{Cd}_{\mathrm{(s)}} E^\circ_{\mathrm{(volts)}} = 0.403\)
\(\mathrm{Cu}^{2+}_{\mathrm{(aq)}} + 2e^- >_{\mathrm{(aq)}} \rightarrow \mathrm{Cu}_{\mathrm{(s)}} E^\circ_{\mathrm{(volts)}} = 0.340\)
In the electrochemical series above, the strongest reducing agents is?
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P2 = 760mm Hg and T2 = 7 + 273 = 280K
From (P2V2) / (T2) = (P1V1) / (T1)
(770 x 30) / (300) = (760 x O2) / (280)
V2 = (770 x 30x 280) / (300 x 760)
V2 = 28.4 cm3
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In the diagram above , the activation energy for the backward reaction is
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A given amount of gas occupies 10.0 dm3 at atm, and 273°C. The number of moles of the gas present is?
(Molar volume of a gas at s.t.p. = 22.4 dm3)
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2Cl2(g) + 2H2O(g) 4HCl(g) + O2(g)
∆H° = +115KJ mol-1. In the above equilibrium reaction, a decrease in temperature will?
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Terylene is synthesized from ethane- 1, 2-diol and benzene - 1, 4-dicarboxylic acid by?
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In the experiment above, X could be a solution of
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From the equation above 1 dm3 of C3H8 require 5dm3 of O2 at s.t.p.
∴ 50cm3 of C3H8 require x = (50) / (1000) x 5 x 1
x = (250) / (1000)
x = 250cm
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\(3\mathrm{CuO}_{(s)} + 2\mathrm{NH}_3{}_{(g)} \rightarrow 3\mathrm{Cu}_{(s)} + 3\mathrm{H}_2\mathrm{O}_{(I)}\ \mathrm{N}_2{}_{(g)}\) (i).
\(2\mathrm{NH}_3{}_{(g)} + 3\mathrm{Cl}_2{}_{(g)} \rightarrow 6\mathrm{HCl}_{(g)} + \mathrm{N}_2{}_{(g)}\) (ii).
\(4\mathrm{NH}_3{}_{(g)} + 3\mathrm{O}_2{}_{(g)} \rightarrow 6\mathrm{H}_2\mathrm{O}_{(I)} + 2\mathrm{N}_2{}_{(g)}\) (iii).
The reactions represented by the equations above demonstrate the?
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The diagram above represents an atom that can combine with chlorine to form
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? CxH6 = 54
12x + 6 = 54
12x = 54 - 6
12x = 48
x = (48)/(12)
x = 4
We have CxH6 butyne
A formular of alkyne
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