13. Classify each of the following chemical changes as...

13. Classify each of the following chemical changes as exothermic or endothermic reaction. Chemical Reaction | Exothermic or Endothermic --- | --- a. A reaction released 550 J. | b. The energy level of the products is higher than that of the reactants. | c. The metabolism of glucose in the body provides energy. | d. The energy level of the products is lower than that of the reactants. | e. In the body, the synthesis of proteins requires energy. | f. CH4(g) + 2O2(g) --?--> CO2(g) + 2H2O(g) + 802 kJ | Exothermic g. Ca(OH)2(s) + 65.3 kJ ---> CaO(s) + H2O(l) | Endothermic h. 2Al(s) + Fe2O3(s) ---> Al2O3(s) + 2Fe(s) + 850 kJ |

Transcript

00:01 Hello students.

00:03 So in this question, in the a part, since 550 jule energy is released, so if energy is released, it means heat is released.

00:17 Heat is released means it would be definitely a exothermic reaction.

00:27 If heat is absorbed, then it is endothermic, but if heat is released, then it is exothermic.

00:33 Exo means outside thermos means heat so heat is released outside outside so it would be exothermic reaction so b energy level of product is higher than that of reacted let's say energy level of this is a diagram this is the energy or potential energy we can say in on the xx is on the x axis we have a reaction progress so here let's say according to the given statement energy of product is higher so here are reactants and here we have product so reaction would go like this and if we can see this is the energy of reactants this is the energy of product so definitely some heat is going to be absorbed by the reaction so this reaction would definitely be endothermic reaction after that let's look at c so the metabolism of glucose in our body provides energy since energy is provided provided so it is released but definitely it would be a exothermic reaction after that d the energy level of product is lower than that of reactant so it is the reverse case of that we have done in b let's also look at this so this is the y xx is this is x xx and if we plot on the y xx's potential energy or energy and at xx's reaction progress so what is going to happen since it is said that energy level of product is lower so here we have reactant and reaction will proceed like this this is product this is reactant this is the activated complex is activated complex or we can say activation energy of the reaction so this gap since product is having higher energy and sorry reactant is having higher energy and product is having lower energy so this amount of energy would be released so definitely this would be an exothermic reaction.

03:44 Now let's go for e.

03:49 So in e we are provided with, in the body the synthesis of protein requires energy.

03:56 Whenever energy is required, energy is required, it means it is absorbed.

04:11 It means a reaction would definitely be endothermic.

04:19 Endo means in and thermons means heat.

04:24 So heat in, if heat is absorbed in the system, then it would be an endothermic reaction.

04:34 After that, we have f, since the reaction is given, methane gas is reacting with oxygen gas.

04:45 It's basically the combustion of methane and co2 is produced along with water.

05:01 So here we have 802 kilojoule, 802 kilojoule of heat.

05:11 So this heat is also released.

05:14 This heat is also released along with these products.

05:19 So definitely if heat is released from the system, this is system and it is getting heated in comparison to surrounding...

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