18 B 19 C and 20 A
cuz that's it I hope it helps you
Courtney’s in minerals can vary due to impurities but is usually diagnostic we determine the relative hardness of minerals using a scale diversity bye mineralogists Freidrich Mohs The scale assigned hardness Tuten common index minerals and is based up on the ability of one mineral to scratch another
The answer is c. Calorimeter
They certainly can. However, they have other groups that are used to classify a compound.
