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Alina [70]
3 years ago
5

Need help with question no 7

Chemistry
1 answer:
Marina86 [1]3 years ago
5 0

Answer:

B) A Mg atom donates two electrons to a Cl atom.

Explanation:

During the formation of magnesium chloride, magnesium loses two electrons to form a stable cation. One chlorine atom requires one electron to form a stable anion. Hence, two chlorine atoms combine with one magnesium by accepting one electron each.

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For the phase change happens, the ice must absorb heat from the surroundings, so it's an endothermic reaction, and because of that ΔH (the enthalpy) must be positive. It is negative for exothermic reactions.

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