Where are the lanthanides and actinides found on the periodic table

What is the mass of 4 molecules of co2

Which characteristics can be used to differentiate star systems? check all that apply.

The reaction below shows a system in equilibrium. how would a decrease in temperature affect this reaction? a. the rate of formation of the gases would increase. b. the equilibrium of the reaction would shift to the left. c. the equilibrium would shift to cause the gases to sublime into solids. d. the chemicals on the left would quickly form the chemical on the right.