Topical Issues of Applied Chemistry Assignment Example | Topics and Well Written Essays - 1750 words

Topical Issues of Applied Chemistry - Assignment Example Light with a wavelength of 220nm has been emitted from an atom. From what energy level could the electron fall if its final energy state was n=2.=When fast-moving electrons hit target metal, the inner core electrons in the atoms of the target metal get ‘excited’ and move from the first orbit (n=1) to say the second orbit (n=2) or third orbit (n=3). The electrons have moved from a lower energy level to a higher energy level. Hence from the question, the electron falls from the n=3 energy level.0g-ice cube at 00C is added to 50.0g of water at 25.00C. Find the final temperature of the mixture.   Answer:   Ice = mass x latent heat of fusion of ice (h)   Ã‚  Ã‚     Ã‚  = 10gx320=3200joules, h=320joules /gram, Water = MC∆T  Ã‚  Ã‚   = 10x4.2x25=1050, Total heat supplied = 1050=3200=4250joules. Therefore  Ã‚   60g x 4.2 x T = 4250. T= 4250/252 = 16.870C   Answer:   Ice = mass x latent heat of fusion of ice (h)   Ã‚  Ã‚     Ã‚  = 10gx320=3200joules, h=320joules /gram, Water = MC∆T  Ã‚  Ã‚   = 10x4.2x25=1050, Total heat supplied = 1050=3200=4250joules. Therefore  Ã‚   60g x 4.2 x T = 4250. T= 4250/252 = 16.870C   Pure hydrogen peroxide (H2O2) is a bit thick in consistency and its boiling point is 1520 The atoms in hydrogen peroxide are in the order HOOH in terms of intermolecular forces, why does hydrogen peroxide have different physical properties than water?   Answer:   H2)2 structure is H-O-O-H. The two behave like isomers (have the same molecular formula but different structure)For isomers:-   H2O2 – Has more bonds hence more intermolecular forces making it have a higher boiling point since more energy is needed to break the bonds.Which of the following has the highest boiling point; Hcl, Ar, F2. Explain in terms of intermolecular forces.  Ã‚   Answer:   HCL= 2.8.7, Ar=2.8.8, F2= 2.7.The forces of attraction between molecules increase with the increase in the size of the molecules.In Argon there is a weak force of attraction between the atoms hence the low boiling point. For Hcl, the chlorine gas alone has a boiling point of –350C. Therefore chlorine has a higher boiling point than fluorine, which is of the same group because of an increase in the size of the molecule in chlorine.When chlorine reacts with hydrogen to from Hcl, a covalent bond is created. This bond is stronger than the forces of attraction between molecules and therefore require more energy to break hence higher boiling point.It should be noted that these are gases and gases have a low boiling point. Hcl can form HCl acid, which is a liquid with a high boiling point. Therefore Hcl is had the highest boiling point followed by Argon and F2 has the lowest.