You have a block of dry ice (-40°c), an ice cube (-5°c) and alcohol (15°c). in which one do molecules move the fastest?
a. ice cube
b. dry ice
c. water
d. alcohol

Sulfuric acid (a component of acid rain) reacts with limestone (calcium carbonate) to produce calcium sulfate and carbon dioxide. this damages buildings and statues made of limestone. which solution of sulfuric acid will damage these structures more quickly? a. 0.001% b. 0.005% c. 0.010% d. 0.015%

How many moles of magnesium is 3.01 x10^22 atoms of magnesium?

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 ?