Estimating time. Using a timing device close your eyes and estimate the passing of 20 seconds. Record in the chart below, 3 times. Complete the calculations for the chart below. Measured Time and % Error. Describe your timing device. How would you set up the formular for % Error for this activity? Did your accuracy improve with practice? Explain

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 !

it is a solid

explanation: