Chemical Reaction Patterns: Tutorial
? Question
With all the coefficients set to 1, how can you tell that the equation is not balanced?
Select all the correct answers.
The number of hydrogen atoms in the reactants does not equal the number in the produ
The number of nitrogen atoms in the reactants does not equal the number in the product
The number of ammonia molecules in the products does not equal the number in the rea
There are two molecules in the reactants, but there is only one molecule in the products.

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 !

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

the answer is c. nacl