7.. A hot air balloon is filled will 25L of air and exerts a pressures of 500atm against the walls of the balloon. What would be the pressure of
the hot air after the balloon drops to 20L of air?

In chemistry, the type of an atom (what element it is) is determined by: a) the number of protons it contains in its nucleus.b) the number of neutrons it contains in its nucleus.c) the number of protons it has in a cloud around the nucleus.d) the number of neutrons it has in a cloud around the nucleus.e) the number of electrons it exchanges with its neighbors.