30 multiple - choice 1 point which statement is best supported by mohs hardness scale? mineral hardness mohs…

30 multiple - choice 1 point which statement is best supported by mohs hardness scale? mineral hardness mohs hardness scale approximate hardness of common objects talc 1 gypsum 2 calcite 3 fluorite 4 apatite 5 feldspar 6 quartz 7 topaz 8 corundum 9 diamond 10 finger - nail (2.5) copper penny (3.5) iron nail (4.5) glass (5.5) steel file (6.5) streak plate (7.0) a a fingernail will scratch calcite, but not quartz. b a fingernail will scratch quartz, but not calcite. c a piece of glass can be scratched by quartz, but not by calcite. d a piece of glass can be scratched by calcite, but not by quartz.

30 multiple - choice 1 point which statement is best supported by mohs hardness scale? mineral hardness mohs hardness scale approximate hardness of common objects talc 1 gypsum 2 calcite 3 fluorite 4 apatite 5 feldspar 6 quartz 7 topaz 8 corundum 9 diamond 10 finger - nail (2.5) copper penny (3.5) iron nail (4.5) glass (5.5) steel file (6.5) streak plate (7.0) a a fingernail will scratch calcite, but not quartz. b a fingernail will scratch quartz, but not calcite. c a piece of glass can be scratched by quartz, but not by calcite. d a piece of glass can be scratched by calcite, but not by quartz.

Answer

Brief Explanations:

Mohs Hardness Scale ranks minerals by their ability to scratch other substances. A harder substance can scratch a softer one. Fingernail has a hardness of 2.5, calcite 3, quartz 7, and glass 5.5. So, a fingernail can scratch calcite (since 2.5 < 3 is false in terms of scratching ability, but a harder - substance - to - softer - substance relation), and quartz (7) can scratch glass (5.5) while calcite (3) cannot.

Answer:

A. A fingernail will scratch calcite, but not quartz. C. A piece of glass can be scratched by quartz, but not by calcite.