An exothermic process releases heat (warms up), and an endothermic process absorbs heat (cools down). Which solutions are endothermic and which are exothermic? What is the sign of the change in enthalpy, H, in each case? Which solution(s) had little or no change in temperature?
When sodium chloride dissolves in water, the ions dissociate:

they emit helium gas that attaches to nearby planets.

they remove low-mass elements from the planets’ crust.

they cause nuclear fusion inside the inner core of planets.

they produce heavy elements such as iron and gold.

explanation:

a) the particles of the chair are strongly held together.

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