When and where would the number of daylight hours be the greatest? A) during the summer near the north pole
B) during the winter near the equator
C) during the winter near the north pole
D) during the summer near the equator

The size (radius) of an oxygen molecule is about 2.0 ×10−10m. make a rough estimate of the pressure at which the finite volume of the molecules should cause noticeable deviations from ideal-gas behavior at ordinary temperatures (t= 300k ). assume that deviatons would be noticeable when volume of the gas per molecule equals the volume of the molecule itself.

Which change will decrease the number of effective collisions during a chemical reaction? a. adding a catalyst b. increasing the surface area c. decreasing the temperature d. increasing the reactant concentrations e. increasing the volume of the reactants

What is the density, d, of a substance with a volume of v = 12.5 cm3 and a mass of m = 74.4 g ?