How many bromine molecules are in 250 g of bromine? (r

Asmall amount of a solid is added to water. the observation made after fifteen minutes is shown in the figure. which of these solids has been probably added to water? a) oil b) sand c) sugar d) wood chips

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

Many ionic compounds and a few highly polar covalent compounds are because they completely ionize in water to create a solution filled with charged ions that can conduct an electric current.