Which of the following statements is true about chemical...

Which of the following statements is true about chemical equilibrium? Select all that apply. At chemical equilibrium, the reactants have been completely consumed. At chemical equilibrium, the concentrations of the species involved in the reaction stay constant (in the absence of an external perturbation). At chemical equilibrium the rate of the forward reaction is equal to the rate of the reverse reaction. At chemical equilibrium, both reactions stop completely.

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00:02 Hi there.

00:03 This question is about a chemical equilibrium.

00:07 Just a generic example.

00:10 Could be a plus b is in equilibrium with c plus d.

00:19 And what equilibrium means is we've reached a point where the forward reaction equals, and i guess i should say the rate, the rate of the forward reaction equals the rate of the reverse reaction.

00:46 Reactions have not stopped, but they are.

00:51 Proceeding at an equal rate.

00:54 So at this point, it appears that everything remains constant.

00:58 Once we reach this equilibrium, we're not going to see a change in the concentration of a and b, and we're not going to see a change in the concentration of c and d.

01:09 The reaction is still taking place, but since it's happening at the same rate, we won't see a change in our amount of reactants or our concentration of our products.

01:19 So let's look at which of these statements.

01:21 Are true here.

01:24 The first one says at equilibrium, the reactants have been completely consumed.

01:28 That is false.

01:30 That would just be a reaction that goes to completion.

01:33 That would not be equilibrium.

01:36 All right, the second one...

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