There are 4 wavelengths that are emitted from a Hydrogen atom that can be seen by the human eye. Two of the wavelengths are the same color. What colors are they?

Agas has a volume of 0.7 l at 300 mmhg. what would be the new volume at 900 mmhg

Astudent is trying to create a table that compares hypotheses, theories, and laws. hypothesis theory law do scientific researchers formulate it? yes yes yes does it explain why things happen? yes yes no yes yes yes is it used to make predictions? no yes yes which of the following questions would most likely fill the blank in the table? is it an intelligent guess? is it newly formulated? is it based on observations? has it been proved?

An alloy contains 66 g of pure zinc. what is the percentage of zinc in the alloy? express your answer to two significant figures and include the appropriate units.