Tips & Tricks - Tip # 9 - Start With A Diagram While Answering Descriptive Questions.

Hello Students. Welcome to Mystery In Chemistry’s Tips & Tricks series. Understanding chemistry and scoring high in exams are two different things and hence require different set of skills . Let us learn some tips to help you score 100/100 in chemistry. So here is the 9th tip - A picture is worth a thousand words. So Start With A Diagram While Answering Descriptive Questions. The best way to answer a descriptive question is clearly draw the diagram related to the question first. It can be a graph, an equation or even a free hand sketch. Then start writing looking at the diagram. Your thoughts will be precise and the answer will require less time to be composed. Moreover, it will be easy for the examiner to understand that whatever you have written is correct, because the diagram is correct. Suppose the question is - Account for the following : Although Fluorine has less negative electron gain enthalpy yet F2 is strong oxidizing agent. Why? (3 Marks) Now for this question First make a flow Diagram. Three energies are involved in it. F2 (g) is first converted to 2F(g) and energy involved is enthalpy of atomization/ dissociation. Then 2F(g) atom is accepting electron and i.e. Electron affinity.. Finally F- ion is going in water. And the Energy is Hydration energy. Combination of all these energies will decide the better oxidizing agent. This diagram is clear and explaining everything. So, after this just complete the answer according to available time and the point that is not in the diagram. Oxidizing agents are substances, that gain electrons in a chemical reactions. Fluorine is strong oxidizing agent because: (I) Low enthalpy of dissociation of (F-F bond) & (II) High hydration energy of F- ion.(due to small size & High charge density) And the answer is complete … So, A picture is really worth a thousand words. Thank you.

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