Biology, 10.04.2020 01:25 smiley29162

Which mineral is harder than calcite but wont scratch a knife?

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Hardness is a measure of a mineral's resistant to abrasion. This property is easily determined and is used widely for field identification of minerals. More than a century ago. Friedrich Mohs (1773-1839), a German mineralogist, assigned arbitrary relative numbers to ten common minerals in order of their hardness.

Hardness
Mineral
Test
1TalcFingernail (2.5)
2Gypsum
3CalciteCooper coin (3)
4FlouriteKnife blade (5.5)
5Apatite
Glass plate (5.5+)

6K-feldspar
7QuartzStreak plate (7)
8Topaz
9Corundum
10Diamond
A simpler version of the Mho's scale can be established using three types of hardness:

SOFT - Minerals that can be scratched with a fingernail

INTERMEDIATE - Minerals that cannot be scratched with a fingernail but can be scratched with a steel nail.

HARD - Minerals that cannot be scratched with a steel nail.

Mineral
Hardness
Calcite

INTERMEDIATE

Mineral cannot be scratched with a fingernail but can be scratched with a steel nail.

Gypsum

SOFT

Mineral can be scratched with a fingernail

Pink Feldspar

HARD

Mineral cannot be scratched with a steel nail.

White Feldspar

HARD

Mineral cannot be scratched with a steel nail.

Gray Feldspar

HARD

Mineral cannot be scratched with a steel nail.

Quartz

HARD

Mineral cannot be scratched with a steel nail.

Answer from: Quest

hydroxyl -oh

alcohols, always polar, can form hydrogen bonds with h2o molecules

carboxyl -cooh

cargoxylic acids, has acidic properties which is a source of hydrogen ions, found in cells in ionized for with a charge of oh-1

carbonyl > co

ketone if within skeleton, aldehyde if group is at the end of skeleton, k & a may be structural isomers, it determines 2 sugars (ketose & aldose)

amino -nh2

amines, acts as a base, it can pick up h+ ions from surrounding solution, ionized with charge of 1+

methyl ch2

addition to rna/dna affects and gene expression

phosphate -opo3 ²⁻

organic phosphates, contributes to negative charge to, molecule that it is a part of, and potential to react with h20

sulfhydryl -sh

thiols, cross-linking stabilize the protein, and it is structure

Answer from: Quest

Air enters through the nose (and sometimes the mouth), moves through the nasal cavity, the pharynx, the larynx, enters the trachea, moves through the bronchi andbronchioles till the alveoli.

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