What is the name of family #8 and what do all the elements in this family have in common

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

Solve this problem using the appropriate law. (remember that ) what is the pressure of 1.9 mols of nitrogen gas in a 9.45 l tank and at a temperature of 228 k?

The total amount of fresh water on earth is estimated to be 3.73 x 10^8 km^3. what is this volume in cubic meters? in cubic feet?