Assessed Questions for Physical Chemistry - Assignment Example

When the mixture is cooled the equilibrium will shift to the left since it is an exothermic reaction. This means that the equilibrium yield of ethane will decrease. When the reaction shifts to the left it will have more moles of the reactants than the product and hence the equilibrium constant will decrease.Ethanoic acid is a stronger acid than carbonic acid since it has a lower pKa constant meaning that its dissociation constant is higher. This has an implication it will dissociate more in water producing more hydrogen ionsThe lattice energy of a crystalline solid is the energy of the formation of the crystal from infinitely-separated ions, molecules, or atoms while the standard enthalpy of formation is the difference in enthalpy of the formation of 1 mole of the compound from its constituent elements, by activation energy.

This is because an increase in temperature makes the molecules have more energy which is higher than the activation energy. Hence making them collide frequently thereby making the reaction rate increase.(ii) Molar conductivity values may be used to calculate the degree of dissociation of a weak acid and then by using a form of Ostwald's dilution law, the acid dissociation constant, Ka, of a weak acid.The sizes of these elements and ions depend on their position in the periodic table. The higher their atomic number the larger their size.

Calcium ion has a smaller size than a calcium atom since it has fewer energy levels. Bromine has a smaller size than selenium ions since it has more protons and selenium ion has more electrons.4. A dye laser used in an infrared spectrometer emits electromagnetic radiation with a frequency of 4.0 x 1014 s-1. What is the wavelength of this radiation and what color would it be? What is the energy of a single photon?5. Molecules of a light-sensitive drug are in-active until they are illuminated with red light with a wavelength of 725 nm.