Morgan did an experiment to see the effect of water temperature on the rate at which sugar dissolves. she placed a sugar cube in several glasses and added the same amount of water at 3 different temperatures to the glasses. she then observed how long it took the sugar to dissolve in each temperature. how should morgan organize her data?
a. by size of the glass
b. by the water temperature
c. by the amount of sugar placed in each glass
d. by the amount of sugar left in the glass after the experiment

B. By the water temperature

Explanation: Increase in temperature increases the rate of a chemical reaction. The temperature of water in the glass determines how fast or slow the sugar cube dissolves in the water (i.e., the time taken for the sugar cube to dissolve in water).

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 !