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Problem 146 Hard Difficulty

The diagrams shown here represent various physical and chemical processes. (a) $2 \mathrm{A}(g) \longrightarrow \mathrm{A}_{2}(g)$
(b) $\operatorname{MX}(s) \longrightarrow \mathrm{M}^{+}(a q)+\mathrm{X}^{-}(a q) .$ (c) $\mathrm{AB}(g)+$ $\mathbf{C}(g) \longrightarrow \mathrm{AC}(g)+\mathbf{B}(g) .(\mathrm{d}) \mathrm{B}(l) \longrightarrow \mathrm{B}(g) .$ Pre-
dict whether the situations shown are endothermic or exothermic. Explain why in some cases no clear conclusions can be made.

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Video Transcript

so for this problem, were given for chemical and physical processes and are supposed to determine whether or not these air except emmick endo thermic or end the use. The first reaction have we have the forward. Where we immediately can notice is that their 1st 2 atoms of a and then they form a bond for diatonic molecule a two and in this case, Reno that some energy is being released because of the formation of this bond that didn't exist before. And so because energy is released, we know. But that must be on X atomic process for the second reaction were given some solid, but then putting water on the ions separate a such now. At first this may look like a decomposition reaction, which is typically endo thermic, but it isn't because these don't split up into elements they split up into ions, which is a very important difference. And because of that difference, it's ambiguous. And the reason why is because we do not know the comparative difference between the energy required to break the Ionic bonds between M plus and ex ally on the left, and we don't know how much energy is released when the M plus an X minus I under formed and because we can't compare those two things, we don't know, it's ambiguous. Now we have part C and in part C, you're giving the reaction that a B plus see yields a C plus beat. Now, once again, there isn't the only thing that's changing is whether or not a is bonded to be or AIDS wanted to see. And as a result, this is ambiguous because we don't know how much energy is required to break the baby bond, and you don't know how much energy is required. Her energy is released when the formation of the EEC bunt I had as a result, we can't compare the reactions from the products. And just like part B, this is ambiguous. Now, if the last part for Part D, you're given some liquid D and then it turns into a gas well, just like any other reaction that would go from a liquid to gas, We know that some energy is required not only to raise the temperature but also to turn it from a liquid into a gas. And so we know that so the energies required and As a result, it is an endo thermic reaction. So those are the answers to all four parts, and those are the final answers.

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Problem

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