Can someone’s answer theses 2 problems? there easy but i can’t get them, and : )

Aphysical reaction is a process in which one or more reactants change into one or more products with different properties. select the best answer from the choices provided t f

In the space, show a correct numerical setup for calculating the number of moles of co2 present in 11 grams of co2

Which terms are used to identify pure substances