Why are the atomic masses for most elements not whole numbers?

How many covalent bonds can each carbon atom form?

What makes a material electrically conductive on the atomic level?

What will be the partial vapor pressure of hexane at 68oC above the mixture of cyclohexane - hexane that contains 34 % of hexane by volume if it is known that the vapor pressure of pure hexane at the given temperature is 760 mm Hg

What is the mass number of an ion that has 83 protons, 80 elections, and 126 neutrons

Which half reaction equation correctly represents a reduction reaction?

How are revolution and year related

Read the scientific question below. "Does sunlight make plants live?" What is a likely hypothesis for the question?

A chemist is using a solution of HNO3 that has a pH of 3.75. What is [H+] for the solution?

What is the oxidation number for CO2

Which is a property of acids in aqueous solutions?