Which of the following orbital sublevels are possible?  Choose all that apply.

A certain railcar can hold up to gallons of material.  An operator would like to load this railcar with material A, which has a density of lbs/gal.  How many pounds of material A will the railcar be able to hold?  Be sure to express your answer to the correct number of significant digits.

Which subatomic particle — descriptor pairs are accurate?  Choose all that apply.

___________________ states that in a chemical process, matter is neither created nor destroyed, such that for any chemical reaction, mass in is equal to mass out.

_________________ energy is the energy of position, arrangement, or state, with the capability of being released in the future but stored or inactive at present, while _________________ energy is the energy of motion, including the random motion of particles known as heat.

Match each substance with the term that best describes it:

Which processes describe a system releasing energy/becoming more stable?

Which of the following elements are paired with their correct location or group on the periodic table?  Choose all that apply.

A highly reproducible and widely applicable description of the behavior of a natural system is known as a(n) ________________________.

The Heisenberg Uncertainty Principle states that it is impossible to know the exact __________________ and _____________________ of a particle at the same time.