How many atoms does theobromine have

Write a 150 word paragraph or two that describes at least three everyday things that exist or occur because of science.

An example of a radioactive isotope is carbon-12. carbon-14. neon-20. neon-22.

What is the percent by mass of phosphorus?

Iron-56 is a very stable nucleus while cobalt-60 is an unstable nucleus. Which nucleus would you expect to have more binding energy per nucleon?

Explain why a wooden spoon is a better choice than a metal spoon for stirring a boiling pot of soup

Calculate the volume of a 0.323-mol sample of a gas at 265 K and 0.900 atm.

What is the molar mass of the following substance : Cs2CO3

What does the velocity of a wave describe

Sulfur (S) has 16 protons and 16 neutrons. How many electron shells does an element of sulfur have?

Which one of the following statements about orbital energies is incorrect? A) The energy of a given orbital increases as the nuclear charge Z increases. B) In many-electron atoms the energy of an orbital depends on both n and l.