Heating devices can be made by passing an electric current through a conductor of: high resistance
low resistance
high conductivity
low conductivity

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.

Write the chemical formula for a compound that is made of an element from group 1 and an element from group 17

Why do electrons further from the nucleus have more energy