PLS HELP!! THIS IS MULTIPLE CHOICE QUESTIONS!
this is science!!

Ans 7. All of these choices are true

Talc -: Fingernail

Gypsum -: piece of copper

Fluorite -: Glass

Apatite -: steel file

Feldspar -: streak plate

Topaz -: spinel (rock shops)

Corundum -: Emery sandpaper

Diamond -: carborundum sandpaper

Explanation:

The fluorite would be scratched

All chocies are correct

Explanation:

in chemistry, a solution’s concentration is how much of a dissolvable substance, known as a solute, is mixed with another substance, called the solvent. the standard formula is c = m/v, where c is the concentration, m is the mass of the solute dissolved, and v is the total volume

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.