Which pair of elements is most likely to chemically combine and form ionic bonds?
a) chlorine and chlorine
b) lithium and chlorine
c) carbon and hydrogen
d) sulfur and oxygen

Nonpoint source pollution is difficult to control because it

Aconcentrated solution of ammonia is 14.8m and has a density of 0.899g/l. what is the concentration of ammonia in this solution in weight percent (%w/w)?

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?