5. The reaction A - C is shown in the diagram below. Is the reaction exothermic or

Chemistry

1 answer:

velikii [3]2 years ago

8 0

Answer:

Exothermic reaction.

Explanation:

From the question given, we obtained the following:

The equation for the reaction:

A —> C

From the diagram given in the question above, the reactant, A has a higher energy than the product, C. This simply indicates exothermic reaction as the enthalphy change, ΔH will be negative for the reaction.

Enthalpy change, ΔH is simply the difference between the heat of product, Hp and the heat of reactant, Hr i.e

ΔH = Hp – Hr

Since the heat of the product is small, the enthalphy change, ΔH will be negative indicating that heat has be released to the surroundings. This is termed exothermic reaction.

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Answer:

Se detailed explanation.

Explanation:

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In this case, since both magnesium and calcium ions are in group IIA, we can review the following similar properties:

- Since both calcium and magnesium are in group IIA they have two valence electrons, it means that the both of them have two electrons at their outer shells.

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- Calcium has 18 electrons and magnesium 10 which are two less than the total protons (20 and 12 respectively) since the both of them have lost two electrons due their ionized form.

- Their electron configurations are:

$Ca^{20}=1s^2,2s^2,2p^6,3s^3,3p^6,4s^2\\\\Mg^{12}=1s^2,2s^2,2p^6,3s^2$