POSSIBLE POINTS Scenario: You wait for your soup to chill.
Soup
Exiting
Bowl, Air
Increasing
Heat is
Entering
the system
The kinetic energy of the system is
Decreasing
The potential energy of the system is Surroundings
:: Surroundings
:: System
:: Entering
:: Exiting
!! Increasing
Decreasing

a. hope i'm right

explanation:

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 !

1.43 x 10^-11 j the guy commented the awnser just making sure u see it .

the correct answer is:

a. formation of precipitation