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Why does the first ionisation energy of atoms generally increase across a period?

The first ionisation energy is defined as the energy required to remove one mole of electrons from each atom of a mole of gaseous atoms. As we go along a period in the periodic table, the atomic number incre...
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What is the pressure of one mole of an ideal gas at 273 K and in a volume of 1m3

This question uses the ideal gas equation. pV = nRT where the temperature is in Kelvin, the pressure in pascals and the volume in m3. To obtain the number of moles the equation is rearranged to give p = nRT/...
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Answered by Maya H. • Chemistry tutor
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What is a chiral carbon and optical isomerism?

A chiral carbon is a carbon with four distinct molecular groups bonded to it. The main consequence of this is imposing optical isomerism to the compound. Optical isomers can be thought of as a non-superimpos...
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Answered by Michael K. • Chemistry tutor
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0.04 moles of sulfur trioxide is placed in a flask (1.50dm^3) and allowed to reach equilibrium at 600 degrees. If 30% of the sulfur trioxide decomposes to sulfur dioxide and oxygen - what is the equilibrium constant?

The easiest way to start your answer is by writing out the equation for the reaction {2SO 3 (g) <-> 2SO 2 (g) + O 2 (g) } and considering what the equilibrium constant is {K c = [products] / [reactants...
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Answered by Isobel W. • Chemistry tutor
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How does a heterogenous catalyst work? (3 marks)

Reactants are adsorbed onto the surface of the catalyst (1). Bonds forms between the atoms and molecules on the surface (2), and the products desorb (3).
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Answered by Yva P. • Chemistry tutor
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