Calculate the frequency of the red light emitted by a neon sign with a wavelength of 690nm

What's the difference between Al3 + and N3-

What is the importance of the electrons? (write in one paragraph)

1. What is the basic unit of organization of all living things

Do pure substances have the same chemical and physical properties

What can you do if you tried to separate a mixture of two substances (A and B) but both components traveled with the solvent front?

Describe your observations of the original solutions. Describe your observations when the silver nitrate was added to the sodium chloride solution.

A gas occupies 18.5L at stp. what volume will it occupy at 735 torr and 57°c?

When two elements form two different compounds, the masses of element B that combine with 1 g of element A can be expressed as a ratio of small whole numbers.

Which best identifies why the rusting of an iron nail in the presence of water and oxygen is in oxidation-reduction reaction

In the laboratory hydrogen gas is usually made by the following reaction:Zn (s) + 2HCl (aq) = H2 (g) + ZnCl2 (aq) How many liters of H2 gas, collected over water at an atmospheric pressure of 752 mmHg and a temperture of 21 Co, can made from 3.