For the system: 2 HI(g) = H2(g) + 12(g), at 445°C, the value for Kc is 0.020. A mixture of H2, I2, and Hl in a vessel at 445°C has the following concentrations:
[HI] = 2.0 mol/L, [H2] = 0.50 mol/L and [12] = 0.10 mol/L
Which one of the following statements about Qc is TRUE for the above system?

it is important to conserve water because there is very limited amount of freshwater here on earth and if we are not smart about how we use it we will only be runnning out of our supply faster than neccessarry.

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.