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3 years ago

Which statement defines activation energy?

Chemistry

2 answers:

Kisachek [45]3 years ago

7 0

I believe that the best answer among the choices provided by the question is It is the difference between reactant energy and maximum energy.

Hope my answer would be a great help for you. If you have more questions feel free to ask here at Brainly.

KatRina [158]3 years ago

4 0

Answer:

Explanation:

Activation energy is the minimum amount of energy required to begin a reaction.

Reactants have their own certain amount of energy which is known as internal energy and represented by $E_{R}$ . A reaction involves an energy barrier that needs to be crossed by the reactants in order to form the products. This energy barrier is the activation energy.

A reaction that does not have activation energy will not take place at all.

Therefore, the statement which defines activation energy is that it is the difference between reactant energy and maximum energy.

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romanna [79]

Answer:

Coefficient of $H^{+}(aq)$ is more than 4

Explanation:

Oxidation: $Sn^{2+}(aq)\rightarrow Sn^{4+}(aq)$

Balance charge: $Sn^{2+}(aq)-2e^{-}\rightarrow Sn^{4+}(aq)$ ......(1)

Reduction: $Cr_{2}O_{7}^{2-}(aq)\rightarrow Cr^{3+}(aq)$

Balance Cr: $Cr_{2}O_{7}^{2-}(aq)\rightarrow 2Cr^{3+}(aq)$
Balance O and H in acidic medium: $Cr_{2}O_{7}^{2-}(aq)+14H^{+}(aq)\rightarrow 2Cr^{3+}(aq)+7H_{2}O(l)$
Balance charge: $Cr_{2}O_{7}^{2-}(aq)+14H^{+}(aq)+6e^{-}\rightarrow 2Cr^{3+}(aq)+7H_{2}O(l)$ .......(2)

$[3\times Equation-(1)]+Equation(2)$ gives balanced equation:

$3Sn^{2+}(aq)+Cr_{2}O_{7}^{2-}(aq)+14H^{+}(aq)\rightarrow 3Sn^{4+}(aq)+2Cr^{3+}(aq)+7H_{2}O(l)$

So coefficient of $H^{+}(aq)$ is more than 4

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3 years ago