Chemistry, 29.01.2020 10:45 Jharsh2300

Which piece of evidence would prove that a reaction is exothermic?
there is a phase change during the reaction.
one of the reactants is baking soda.
the reactants have more energy than the products.
there are more moles of gas in the products than in the reactants.

Answers: 1

Show answers

Answers

The reactants have more energy than the products. If a reaction is EXOthermic, it loses energy during the reaction, so the output (products) will have less energy than the input (reactants).

Answer from: tdahna0403

Option (c) is the correct answer.

Explanation:

In an exothermic reaction, excess of energy is released into the surroundings as a result there occurs decrease in the energy of products.

For example, $A + B \rightarrow C + D + Heat$ is an exothermic reaction.

Whereas in an endothermic reaction, energy is absorbed by reactant molecules and therefore, energy of products is more than energy of reactants.

For example, $A + B + Heat \rightarrow C + D$ is an endothermic reaction.

Thus, we can conclude that the reactants have more energy than the products is a piece of evidence that would prove that a reaction is exothermic.

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.

Answer from: Quest

the answer is the first option

explanation:

just googled it m8. not that hard

lol

Other questions on the subject: Chemistry

Chemistry, 22.06.2019 12:30, emmalybrown

A50.0 ml sample of gas at 20.0 atm of pressure is compressed to 40.0 atm of pressure at constant temperature. what is the new volume? 0.0100 ml 0.325 ml 25.0 ml 100. ml

Answers: 1

continue

Chemistry, 22.06.2019 17:30, shookiegriffin

I'm learning about the periodic tables and what each subject's configuration is. for example, hydrogen is 1s^1, but i don't understand how you get that. can someone me understand how to figure out how to figure this out? sorry if the question makes no sense, but it would really a lot if you could me understand! you so much if you can!

Answers: 1

continue

Chemistry, 22.06.2019 19:30, kenoknox

Astudent conducts an experiment to determine how the amount of water given to a plant affects its growth. what is the independent variable for this experiment?

Answers: 1

continue

Chemistry, 22.06.2019 20:00, rafaelasoareschagas7

The picture represents the process that produces most of the energy used by living organisms on earth. which process is represented in the picture? a) the magnetic attraction between two hydrogen nuclei. b) the fusion of hydrogen nuclei to produce a helium nucleus in the core of the sun. c) the fission of hydrogen nuclei to produce a helium nucleus in the core of the sun. d) the chemical reaction between hydrogen nuclei to produce a helium nucleus in earth's atmosphere.

Answers: 3

continue

You know the right answer?

Which piece of evidence would prove that a reaction is exothermic?
there is a phase change du...