Why is it necessary to use models to study submicroscopic objects as atoms and molecules

What is the total reduction potential of a cell in which potassium (k) is reduced and copper (cu) is oxidized? a. 2.59 v b. 3.27 v c. -3.27 v d.-2.59 v

Omg imgonnafailnfiedkla use complete sentences to explain how the mass of hydrogen is conserved during cellular respiration.

What does the mass of 0.7891 mol of ferric oxide (fe2o3)