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Rashid [163]
3 years ago
12

I need help with number 8 and fast it's due tomorrow. :)

Chemistry
1 answer:
EastWind [94]3 years ago
3 0
Nuetrons+protons. and number 7 is electrons and protons
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A mineral is scratched by apatite but not by calcite what could it’s hardness value be
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Answer:

hi!

Explanation:

The Mohs Hardness Scale ranks the order of hardness of minerals and some common objects. For example, your fingernail can scratch the minerals talc and gypsum, with a hardness of 2 or lower. A copper penny can scratch calcite, gypsum, and talc.

One of the most important tests for identifying mineral specimens is the Mohs Hardness Test.  

This test compares the resistance of a mineral to being scratched by ten reference minerals known as the Mohs Hardness Scale (see table at left).  

The test is useful because most specimens of a given mineral are very close to the same hardness. This makes hardness a reliable diagnostic property for most minerals.

"Hardness" is the resistance of a material to being scratched. The test is conducted by placing a sharp point of one specimen on an unmarked surface of another specimen and attempting to produce a scratch.  

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