Coming to terms with chemical equilibrium

In order to understand chemical reactions, you are going to have to come to terms with an important concept, that is, chemical equilibrium.

In AUS-e-TUTE's new set of resources (tutorial, game, test and exam questions with worked solutions) we look at how the type of system (open or closed) and the type of reaction (reversible or irreversible) determines whether a system can achieve a state of balance otherwise known as chemical equilibrium.

AUS-e-TUTE members should log-in to use these new resources.

If you are not an AUS-e-TUTE members you can view the tutorial for free at 

https://www.ausetute.com.au/equilibriumsystem.html

Reversible and Irreversible Changes

 Physical changes are, in general, reversible, but only some chemical changes are reversible while others are irreversible.

AUS-e-TUTE has just added new resources to help you classify changes as reversible or irreversible.

AUS-e-TUTE members should log-in to use the new resources.

If you are not an AUS-e-TUTE Member you can access a "free-to-view" tutorial at https://www.ausetute.com.au/reversible.html

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 (H_2(g)) are given off and the remaining solution contains chloride ions and magnesium ions (MgCl_2(aq)):

Mg_(s) + 2HCl_(aq) → H_2(g) + MgCl_2(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:
http://www.ausetute.com.au/spontaneous.html