Which change occurs when an atom in excited state returns to ground state? 1 energy is emitted 2energy is absorbed 3 the number of electrons decreases 4 the number of electrons increases

What is the de Broglie wavelength (in meters) of a 45-g golf ball traveling at 72 m/s?

A unit of compact bone is called a

Name four latin america countries where most of the precious metals (gold, silver, copper) are found.

What can be absorbed or produced as the result of a chemical reaction?

Which mixture is heterogeneous?

Sodium hypochlorite (Na xCl yO z) is the active ingredient in household bleach. A 250.0 g sample of sodium hypochlorite contains 77.2 g sodium, 119.1 g chlorine, and the remainder is oxygen. Calculate the empirical formula of sodium hypochlorite.

The tapeats sandstone in the grand canyon is an example of a clastic sedimentary rock. such clastic sedimentary rocks can be distinguished from biochemical sedimentary rocks by

An ice cube and a scoop of table salt are left outside on a warm, sunny day. Explain why the ice cube melts and the salt does not

Which atomic orbitals overlap to form the C-O bond of dimethyl ether, (CH3) 20? O c 2sp^3 + 2sp^3 OC 2sp^2 + 0 2p O c 2sp^2 + 0 25p^2 O C 2sp^3 + O 2sp?

For the reaction CO+2H2=CH3OH at 700 K, equilibrium concentrations are [H2]=0.072 M, [CO] = 0.020M, and [CH3OH] = 0.030 M. Calculate K