if you are given the mass of a substance sample in grams, what is the first step you should take to determine how many representative particles are in that sample?

find the molar mass of the substance

convert the grams to particles

convert the mass to moles

convert the moles to particles

Yes you are correct use the scientific method

The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .