Help out please and i will mark you brainliest!!

What is the relation between concentration of reactants and the rate of chemical reaction?

Consider the elements bromine and chlorine; which elements has a larger ionic radius ?

What would be the original temperature of a gas that has a volume of 2.0 l and a pressure of 2.0 atm and an unknown temperature that the volume increased to 3.5 l in its pressure decreased to 1.0 atm if the final temperature is measured to be 11°c