Home Chemistry Can copper be scratched by a fingernail or blade knife. why? Can copper be scratched by a fingernail or blade knife. why?Chemistry Jadea520October 23, 20215 CommentsCan copper be scratched by a fingernail or blade knife. why?
it could by blade knifeExplanation:fingernail has hardness 2.5; copper penny, about 3.5; a knife blade, 5.5Reply
The answer is 3.Explanation:MOHS' SCALE OF HARDNESSMineralHardness Fluorite4Elmwood mine, Tennessee 2.5 cm. (note phantom)Calcite3Elmwood Mine, Tennessee 8 cm. (twinned)Gypsum2Wyoming 12 cm. Note "fishtail" twin on leftTalc1Rope's Gold Mine, Michigan (green) 4 cm. across talc massReply
No, Because they r fast
Explanation:
it should be letter E
it could by blade knife
Explanation:
fingernail has hardness 2.5; copper penny, about 3.5; a knife blade, 5.5
A copper penny can scratch calcite, gypsum, and talc.
The answer is 3.
Explanation:
MOHS' SCALE OF HARDNESS
MineralHardness
Fluorite4Elmwood mine, Tennessee 2.5 cm. (note phantom)
Calcite3Elmwood Mine, Tennessee 8 cm. (twinned)
Gypsum2Wyoming 12 cm. Note "fishtail" twin on left
Talc1Rope's Gold Mine, Michigan (green) 4 cm. across talc mass