questions with Gen. Chem

[rdh2dds26]

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Can somebody help me making sense of this question from Top Score test?

Which of the following are characteristics of Keq?
I. An equilibrium mixture of products and reactants will contain approximate equal amounts of products and reactants if Keq is close to one
II. Keq is a characteristic of a given system at a given temperature
III. Keq can be very large compare to 1.

Top score answer: I, II, and III

My answer is just II and III because I know when a system is at equilibrium Keq is equal to 0, but not close to one....what's going?

 

[hchc]

Keq = products over reactants. If Keq is = 1 then they should have similar concentrations. I think you're confused over what the definition of Keq is. At equilibrium Keq can equal any number and is dependent on the reaction at a given temp...

 

[oceanblue5841]

Can somebody help me making sense of this question from Top Score test?

Which of the following are characteristics of Keq?
I. An equilibrium mixture of products and reactants will contain approximate equal amounts of products and reactants if Keq is close to one
II. Keq is a characteristic of a given system at a given temperature
III. Keq can be very large compare to 1.

Top score answer: I, II, and III

My answer is just II and III because I know when a system is at equilibrium Keq is equal to 0, but not close to one....what's going?

Keq can be seen as a ratio of product to reactants, so if Keq were 1(1/1), their would be equal amounts of product and reactants at a given moment. A reaction is at equilibrium, when the ratio of products to reactants remains the same. For example, lets say we are in a room that is divided by a line, one half of the room has 20 people, while the other has 10. The ration is 2/1 a system at equilibrium would require that this ratio stay the same. So for every person that crosses the room, a shift would have to occur to reestablish that 2/1 ratio.

 

[rdh2dds26]

I got it now...thanks guys!!!!