In a hydrogen atom, what color is the emission line observed when electrons drop from the fifth to the second energy level?

Avogadro's number represents which of the following? one mole of representative particles 6.02 x 1023 moles of representative particles 6.02 x 10-23 representative particles one representative particle

These are large chemical compounds, primarily consisting of carbon and hydrogen, that exist in living organisms.

Some historians say that the U. S.-Mexican War was inevitable. Do you agree or disagree?

Water vapor changing to liquid water

Without the process of transpiration, what might happen to a plant? A. It might turn orange. B. It would grow more slowly. C. It would have fewer leaves. D. It might burst.

Are the following statements true or false? A. Two pi bonds comprise a double bond. B. Bonds formed from atomic p orbitals are always sigma bonds. C. Side-to-side overlap results in a bond with electron density above and below the bond axis. D.

Does beryllium or sodium have the same inside electron arrangement as magnesium

How do carbohydrates relate to organic chemistry

Periodic table, chemistry questions who discovered lanthanides. how did they discover it, when did they discover it.

A flask containing 155cm^3 of hydrogen was collected under a pressure of 22.5kPa. What pressure would have been required in order for the volume of the gas to have been 90.0 cm^3 at constant temperature?