Question 1 of 8organic chemistry / combustion
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In the apparatus shown, 100\ cm^3 of a mixture of ethane and ethene is passed repeatedly over liquid A, which absorbs only one of the…
In the Born-Haber cycle for aluminium oxide shown, the enthalpy change \Delta H_6 = -15300.1\ kJ\,mol^{-1} is
Dinitrogen pentoxide is formed by the sequence I N_2(g) + O_2(g) \rightarrow 2NO(g) \Delta H = +180\ kJ\,mol^{-1} II NO(g) +…
The standard enthalpy change of combustion of hydrogen is -286\ kJ\,mol^{-1}. The thermochemical equation for this change is
2.000 g of lead was converted completely into lead(II) chloride, giving 2.682 g of the chloride. Taking A_r(Cl) = 35.45, the relative…
A buffer solution is one which
For a gas which behaves ideally, a graph of pV against p at constant temperature is
0.6 mol of SO_2 and 2.0 mol of O_2 were mixed and allowed to reach equilibrium, 2SO_2(g) + O_2(g) \rightleftharpoons 2SO_3(g). At…
The first ionisation energy of an element is the energy required to remove
Burning butanol raised the temperature of 150 g of water by 10 °C. Taking the specific heat capacity of water as 4.2\ J\,g^{-1}\,K^{-1},…
For 2NO(g) + Cl_2(g) \rightleftharpoons 2NOCl(g), raising [NO] from 0.10 to 0.20\ mol\,dm^{-3} at constant [Cl_2] raised the initial rate…
The iodine liberated in an experiment required 15.0\ cm^3 of 0.03\ mol\,dm^{-3} sodium thiosulphate. The number of moles of thiosulphate…
The solubility of barium hydroxide at 25 °C is 0.24\ g\,dm^{-3}. Given that M_r[Ba(OH)_2] = 171, the molar concentration of the saturated…
A Bronsted-Lowry acid is a species which
A dynamic equilibrium is a state in which
Fig. 1 shows the first ionisation energies of the elements sodium to argon. The value for aluminium is lower than that for magnesium…
For the equilibrium N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g), the expression for K_p is
The ideal gas equation is
What is the composition of the free radical of chlorine, ^{35}Cl?
The graph shows the mass spectrum of an organic compound X. Which peak represents the relative molecular mass of X?
What changes in oxidation numbers take place when copper reacts with concentrated nitric acid to give a blue solution and a brown acidic…
The graph shows the decomposition of cyclopropane to propene. Which statement is correct?
A mixture of equal volumes of methane and ethane was burned in excess oxygen. After cooling to room temperature, the residual gas absorbed…
An acidic solution of MnO_4^{2-}_{(aq)} undergoes the reaction shown below: 3MnO_4^{2-}_{(aq)} + 4H^+_{(aq)} \rightarrow 2MnO_4^-_{(aq)} +…
What is the order of increasing energy of given orbitals in an atom of titanium?
Which statement about transition elements is correct?
Which statement about relative atomic mass is correct?
Nitrogen dioxide decomposes on heating according to the equation: 2NO_{2(g)} \rightleftharpoons 2NO_{(g)} + O_{2(g)} On introducing 4.8…
Which ion contains an unpaired electron?
Which two assumptions are made in the kinetic theory of gases?
What are the products of complete combustion of silane?
In a reaction X + Y \rightarrow 2Z, it was found that doubling the concentration of X caused the rate to increase four times but doubling Y…
A research student performed a constant current electrolysis of silver solution using a carbon electrode as the cathode. The electrolysis…
Which of the following is the weakest acid in aqueous solution?
Which ion is least polarising?
Which statement is correct about standard hydrogen electrode?