How you would prepare 200.0mL of a 0.25M NaOH solution.
a) 2g
b) 4g
c) 8g
d) 6g

How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer

In the millikan oil drop experiment they determined that every drop had a charge which was a while number multiple of -1.60x10^-19. if a drop has a total charge of -9.60x10^-19 then how many excess electrons are contained within the drop?

Drug abuse will not lead to physical and psychological dependence. true or false ?