List three examples of selectively permeable material or item

In a given chemical reaction, the energy of the products is greater than the energy of the reactants. which statement is true for this reaction?

Consider an ordinary, helium-filled party balloon with a volume of 2.2 ft3. the lifting force on the balloon due to the outside air is the net resultant of the pressure distribution exerted on the exterior surface of the balloon. using this fact, we can derive archimedes’ principle, namely that the upward force on the balloon is equal to the weight of the air displaced by the balloon. assuming that the balloon is at sea level, where the air density is 0.002377 slug/ft3, calculate the maximum weight that can be lifted by the balloon. note: the molecular weight of air is 28.8 and that of helium is 4.

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?