What does it mean to say that an electron's energy within an atom is quantized?

Which of the following has mechanical energy

Silver (Ag) has two stable isotopes: 107Ag, 106.90 amu, and 109Ag, 108.90 amu. If the average atomic mass of silver is 107.87 amu, what is the natural abundance of each isotope? (expressed as a percentage)

Which mineral property can be determined simply by observation

What did Democritus teach? A that all matter was composed of tiny atoms B that all mater was composed of earth, fire, water, and air C that atoms could be divided into smaller particles D that experiments should be done in a systematic way

Cuantos gramos de sal pueden disolverse en 50 gramos de agua?

A gas occupying a volume of 25 ft3 weighs 3.5 lbf on the moon, where the acceleration of gravity is 5.47 ft/s2. determine its weight, in lbf, and density, in lb/ft3, on mars, where g = 12.86 ft/s2.

What's the physical state of hydrogen and zinc in 2HCl+Zn=ZnCl2+H2

H2O (s) ⇒ H2O What would be the best argument against writing this in the form of a chemical equation?

What effect does an increase in products have on the reaction rate of a mixture at equilibrium?

Explain the basic principles of a distillation unit operation