A. Cup A contains 4 molecules of hydrogen gas, cup B contains 4 molecules of oxygen gas and cup C contains one molecule of ozone and one molecule of oxygen gas. Which of the cups' contents would be classified as a pure substance? List all that
apply and explain how these are modeling pure substance

Determine the wavelength of the light absorbed when an electron in a hydrogen atom makes a transition from an orbital in the n=3 level to an orbital in the n=7 level.

Harvey kept a balloon with a volume of 348 milliliters at 25.0˚c inside a freezer for a night.  when he took it out, its new volume was 322 milliliters, but its pressure was the same.  if the final temperature of the balloon is the same as the freezer’s, what is the temperature of the freezer? the temperature of the freezer is  kelvins.

When a septic tank backs up a goes in to clean it out