Topic 2 - Inorganic chemistry Exam With 100% Correct Answers 2024

Topic 2 - Inorganic chemistry Exam With 100% Correct Answers 2024 What is the trend in atomic radius down group 7 Increases because as you go down the group, there are more shells so more shielding so a weaker attraction between the nucleus and the outer electrons is the ionic radius bigger compared to the atomic radius in group 7 Yes because the halide ion has the same number of protons but more electrons than the halogen atom so the attraction is weaker What is the trend in boiling point down group 7 Increases. The halogens become less volatiles. Down the group, molecules are larger and have more electrons therefore the vws between the molecules are stronger and require more energy to overcome What is the trend in electronegativity down group 7 Decreases. As you go down the group, there are more shells and more shielding so the attraction between the nucleus and the pair of electrons in the covalent bond is weaker What is the trend in first ionisation energy down group 7 Decreases because there are more shells and more shielding therefore the attraction between the nucleus and the outer electron is weaker and less energy is required to overcome it and remove the electron What is the appearance of chlorine It has a green colour. It is a gas at room temp. Is pale green in aqueous solution and in cyclohexane as well What is the appearance of bromine It is red-brown liquid at room temp. It is orange in aqueous solution and in cyclohexane What is the appearance of iodine It is a black solid at room temp and is brown in aqueous solution and pink-purple in cyclohexane What type of solvent are halogens more soluble in In non-polar solvents such as cyclohexane because halogens are non-polar What happens to the solubility of halogens down the group in water Decreases as the molecules get larger Describe the reaction of chlorine with KBr Orange solution as bromine is formed Describe the reaction of chlorine with KI Brown solution as iodine is formed Describe the reaction of bromine with KCl Orange solution. Bromine remains - does not react Describe the reaction of bromine with KI Solution turns brown as iodine is produced Describe the reaction of iodine with KCl Solution stays brown because iodine remains - does not react Describe the reaction of Iodine with KBr Solution stays brown because iodine remain - no reaction What can be done to confirm the identity of the halogen present in each of these reaction Add cyclohexane. The colour of the top layer tells you what halogen is present. It is orange when bromine is present and pink-purple when iodine is present Why are halogens oxidising agents They can accept electrons and form halide ions What happens to the oxidising ability of ha