Diluted < > Concentrated 4.2.1 Common units of concentration Chemists use grams per cubic decimetre (dm 3 ) + ( m 3 P I Volvo Logistics I Busjkss Ann Asia Click on the ad to read more Download free eBooks at bookboon.com Fundamentals of Chemistry Substances and Reactions 1.9 Physical separation 16 1.10 Physical and chemical change Physical change: • Does not involve changing substances into different shapes) and ductile (can be pulled out into.