What must be present in order for electricity to flow?

A. positive and negative charges

B. an electrical outlet

C. Neutrons

D. water

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

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.

A650 ml sodium bromine solution has a bromide ion concentration of 0.245 m. what is the mass (g) of sodium bromide in solution? a) 103.b)0.00155.c)16400.d) 16.4.e) 0.159