3 Question 4 (1 point)
Which of the following will increase the production of O2 in the following reversible reaction?
H2(g) + SO2(g) = H2S(g) + O2(g)
Removal of SO2
Removal of H2
ОООО
Addition of a catalyst
Removal of H2S
Question 5 (1 point)
Which of the following chemical systems would be "stressed" by a change in pressure

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.

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.