What is the formula for sodium sulfide? a.) na3s b.) nas2 c.)nas d.) na2s

The number of moles of a given mass of a substance can be found without knowing its molecular formula or molar mass. true false

Which statement characterizes synthetic polymers? a. they come from animals and plants. b. they are found in nature. c. they are made in a lab. d. they are components of starch.

Ascientist conducted an experiment and discovered that certain plants grow faster when given a particular amount of fertilizer. anouther scientist conducted the same experiment and got similar results. which concept does this best illustrate? a) repetition b) replication c) precision d) validity