This is the question- I take a scoop of driveway salt and put it in a bucket with water - stir and dissolve it. The bag says it contained magnesium chloride. Draw a picture of what it would look like at the atom level. I need help please I appreciate it!

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 .