Choose the law that best describes the following statement: the volume of a gas is directly proportional to the number of moles of gas when temperature and pressure stay the same.
a. boyle's law
b. charles's law
c. avogadro's law
d. combined gas law

What is the relationship between the direction of motion of the balloon and the wind currents

Materials will have different energies associated with the electrons inside them. this is related to how strongly bound they are by their work function. if we sandwich a material with a very low energy between two materials with a high energy, we create a trap for an electron. if this trap is very narrow in one direction in comparison to the others, this is approximately a 1-dimensional box that confines the electron. what is the lowest energy of an electron in the box if the thinnest direction across the materials is 4.81 nm?

According to the second law of thermodynamics, what is true of entropy in all natural systems? a.it will always decrease. b.it will always increase. c.it will always remain the same. d.it is impossible to measure. e.it will always equal zero.