Friday, January 26, 2018

Spontaneous Chemical Reactions

What makes a chemical reaction spontaneous?
If I add hydrochloric acid (HCl(aq)) to metallic magnesium (Mg(s)), bubbles of hydrogen gas (H2(g)) are given off and the remaining solution contains chloride ions and magnesium ions (MgCl2(aq)):
Mg(s) + 2HCl(aq) → H2(g) + MgCl2(aq)
But if I try to bubble hydrogen gas through an aqueous solution of magnesium chloride, nothing happens. No solid magnesium forms! Why?
AUS-e-TUTE has just added a new tutorial, game, test and exam to help you understand what makes a reaction spontaneous, nonspontaneous, reversible or irreversible.
AUS-e-TUTE Members should log-in to use these new resources (listed under Thermodynamics in the Physical Chemistry section).

Not an AUS-e-TUTE Member?
A "free-to-view" spontaneous reactions tutorial is currently available for evaluation purposes at:

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