1 Identify whether wounds covered in film or ordinary plasters developed the largest bacterial population
2 Describe the shape of the graphs and explain what these graphs show about the
population of bacteria for the film and the ordinary plaster.
1 ordinary plaster
2 The graphs begin at the same point, and rises in a curve-like manner until the peak at Days 3
and 4, before decreasing rapidly until Day 6, and tailing off to Day 8.
These graphs show that initially the bacterial growth is slow in the first day, before increasing
rapidly until Days 3 and 4. The bacterial population decreases rapidly until Day 6, and more
slowly until Day 8.

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !

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.