Please who can help ?! ASAP

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?

How are the terms group and period used on the periodic table

Which is not true regarding reaction rates? (2 points) catalysts are not used up in the reaction. catalysts speed up reactions by lowering the activation energy. reaction rates decrease as the concentration of reactants decrease. during reactions, concentrations of all reactants decrease at the same rate.