Activation energy is ____. (1 point)

2 answers:

7 0

Activation energy is defined as the least amount of energy that is needed to be available in a chemical system with potential reactants in order to result a chemical reaction. Therefore, the correct answer would be the first option: the heat released in a reaction.

marysya [2.9K]3 years ago

5 0

Activation energy is the energy barrier between the reactants and products.

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Which of the following statements correctly explains why bromination reactions are more selective than chlorination reactions.

Vinvika [58]

Answer: A bromine radical is more stable than chlorine radical, so it is less reactive and more choosy.

Explanation:

A chlorine atom being more electronegative in nature is able to attract a hydrogen atom more readily towards itself as compared to a bromine atom.

Since bromine is less electronegative in nature so bromine will be more selective as a hydrogen abstracting agent. As a result, bromine radical is more stable in nature than chlorine radical.

Thus, we can conclude that bromine radical is more stable than chlorine radical, so it is less reactive and more choosy.

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Calculate the standard molar enthalpy for the complete combustion of liquid ethanol (c2h5oh) using the standard enthalpies of fo

olga2289 [7]

Answer : To calculate the standard molar enthalpy of complete combustion of liquid ethanol can be done by using the formula given below;

$C_{2} H_{5}OH + 3O_{2} ----\ \textgreater \ 2CO_{2} + 3 H_{2}O$

Now, the enthalpies of the elements in their standard state is zero always.

So the $H_{reaction} = H_{products} - H_{reactants}$

Here we can avoid the heat of enthalpy of oxygen,carbon dioxide and water as they exists in their standard states.

So the $H_{reaction}$ = $H_{ C_{2}H_{5}OH}$