21.) This substance consists of two or more nonmetal elements in a fixed ratio. a.) element
b.) mixture
c.) molecule
d.) compound

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

Voltaic cells produce a positive overall charge. what does this indicate? a. the reaction is likely to be endothermic. b. the reaction is spontaneous. c. the reaction is not likely to occur. d. the reaction is not spontaneous.

How is the atomic number of a nucleus changed by alpha decay