Chemistry, 05.10.2019 23:30 okokjade

Which reaction is endothermic? 2brcl mc019-1.jpg br2 + cl2 + 29.3 kj 2h2 + o2 mc019-2.jpg 2h2o + 572 kj c + o2 mc019-3.jpg co2 + 394 kj n2o4 + 59 kj mc019-4.jpg 2no2

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Are you referring to this question?
Which reaction is endothermic?
a) 2BrCl mc019-1.jpg Br2 + Cl2 + 29.3 kJ
b) 2H2 + O2 mc019-2.jpg 2H2O + 572 kJ
c) C + O2 mc019-3.jpg CO2 + 394 kJ
d) N2O4 + 59 kJ mc019-4.jpg 2NO2

If so, the answer would be letter D.
when you say endothermic reaction, heat is absorbed, heat is released in exothermic.

Answer from: Quest

- "the choice that is not an indicator of a chemical change is "state of matter changes". more common than not, chemical reactions produce energy in the form of light or heat. along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid)."

Answer from: Quest

answer: - 3.) the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.

solution: - as per the rules, oxidation number of oxygen in its compounds is -2. the sum of oxidation numbers of all the elements of a molecule or compound is zero.

also, the oxidation number in elemental form is zero.

in no, the oxidation number of o is -2 so the oxidation number of n is +2 so that the sum is zero.

similarly, the oxidation number of c in co is +2 and o is -2.

on product side the oxidation number of n is 0 as it is in the elemental form( $n_2$ ) .

oxidation number of c in carbon dioxide is +4 as there are two oxygen in it and we know that each oxygen is -2.

so, oxidation number of n is changing from +2 to 0 and the oxidation number of c is changing from +2 to +4.

since nitrogen is reduced and hence no is acting as an oxidizing agent. carbon is oxidized and so co is acting as a reducing agent.

so, the right choice is number 3.)the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.

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Which reaction is endothermic? 2brcl mc019-1.jpg br2 + cl2 + 29.3 kj 2h2 + o2 mc019-2.jpg 2h2o + 57...

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