Cells are microscopic. what does that mean?

Think of a microscope. Microscopic items/beings can only be seen under a microscope. You can also see that they would be very small, because micro = small.

SEE EXPLANATION

Explanation:

A)

1) The balanced  chemical reaction is;

Fe2O3 + 3H2O> 2Fe(OH)3

2) C12H22O11> 12 C + 11H2O

B)  1 is a combination reaction

     2 is a decomposition reaction

C) The molar mass of NH3 is 14 + 3(1) = 17 g/mol

Percentage composition of N = 14/17 * 100/1 = 82. 4 %

D) 1 mole of O2 contains 6.02 * 10^23 particles

E) For (NH4)3 PO4

We have 3(14 + 4(1)) + 31 + 4(16) = 149 g/mol

F) 1 mole of CaCO3 contains 100g of CaCO3

1.25 moles of CaCO3 contains 1.25 * 100/1 = 125 g of CaCO3