Need and will give alot of pointswhere is most of the mass in an atom? a. electrons b. nucleus c. electron cloud d. protons e. neutrons

What is the molar mass of potassium nitrate, kno3

Give one example of a pure (exact) number and of an estimated (measured) number.

How long could you survive without electricity? what parts of your life would be affected by loss of electricity? should you prepare for an electricity outage, and if so, how would you prepare? what backup system could your family or community install to generate limited amounts of electricity during an outage? how does this system create an electric force field and generate electric current?