Acontainer of hydrogen at 172 kpa was decreased to 85.0 kpa producing a new volume of 765 ml. what was the original volume

Often on a topographic map, every fifth contour line is darkened. what is this line called? a. key b. slope c. benchmark d. index contour

How are isotopes of the same chemical element alike? how are they different?

As we move from left to right across the periodic table, what is the general trend? a) atomic radii increase. b) electronegavitiy decreases. c) nuclear shielding increases. d) metallic character decreases.