Problem: The following diagrams represent a hypothetical reaction A , with A represented by red spheres and B represented by blue spheres. The sequence from left to right represents the system as time passes.In which diagram(s) is the system in equilibrium?

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We're being asked to determine which diagram(s) below is the system in equilibrium.


A reaction reaches equilibrium:

• once the rate of the forward reaction equals the rate of the reverse reaction
• once at equilibrium there is no net change in the concentration of reactants or products


The sequence from left to right represents the system as time passes. Let's analyze each diagram:

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Problem Details

The following diagrams represent a hypothetical reaction A , with A represented by red spheres and B represented by blue spheres. The sequence from left to right represents the system as time passes.

The diagram is described from left to right: (1) 10 red spheres (2) 8 red; 2 blue spheres (3) 6 red; 4 blue spheres (4) 4 red 6 blue spheres (5) 4 red; six blue spheres.

In which diagram(s) is the system in equilibrium?

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Chemical Equilibrium concept. You can view video lessons to learn Chemical Equilibrium. Or if you need more Chemical Equilibrium practice, you can also practice Chemical Equilibrium practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Petrovich's class at NCSU.