It takes 60 mL of 0.20 M of sodium hydroxide (NaOH) to neutralize 25 mL of carbonic acid (H2CO3) for the following chemical reaction: 2 NaOH + H2CO3 → N2CO3 + 2 NaOH

The concentration of the carbonic acid is .
A) 0.48m
B) 0.10m
C) 0.96m
d)0.24m

Which of the following observations indicates that there is a small, dense, positively charged part in the center of an atom? some uncharged particles are scattered by a gold foil. all uncharged particles are attracted towards a gold foil. all positively charged particles pass straight through a gold foil. some positively charged particles bounce back from a gold foil.