Refer to a periodic table and tell how many helium atoms (he) would be needed to
get close to the same mass as an average oxygen atom (o).
a. six
b. four
c. twelve
d. one-fourth

Agas in a balloon at constant pressure has a volume of 160 ml at -125*c. what is its volume at 29.0*c?

Why is soap used to remove grease? a. its nonpolar end dissolves the grease. b. it makes the water bond with the grease. c. it chemically bonds with the grease. d. its polar end dissolves the grease. correct answer for apex - a, its nonpolar end dissolves the grease.

Determine the reaction and balance the following equations urgent due in the morning