What mass of dilute trioxonitrate (V) containing 10% W/W of pure acid will be required to dissolve 2.5g chalk CaCO3

Copper, silver, aluminum, cobalt, chromium, mercury 

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 .

What do you need with it’s not a question your just stating what it says

Answerrestate the main idea,essay or thesis, summarize the three subpoints of your essay, leave the reader with an interesting final impression;