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Nastasia [14]
3 years ago
12

Which mineral has the same hardness as a fingernail?

Chemistry
2 answers:
Marina86 [1]3 years ago
4 0
Gypsum has the same hardness as a fingernail
ipn [44]3 years ago
4 0
<h3>Answer:</h3>

                  Gypsum

<h3>Explanation:</h3>

                   The hardness of minerals or substances is measured qualitatively using Mohs Scale. In this scale the hardness is measured qualitatively by characterizing the resistance shown by one substance when rubbed against second substance. Therefore, greater points are given to those substances which are capable of making scratches on other substances. The Mohs Scale of given compounds is as follow,

                                     Diamond        <em>  10</em>

                                     Fluorite          <em>  4</em>

                                      Topaz                <em>8</em>

                                      Gypsum            <em>1.5 to 2</em>

While the hardness value of Fingernail is <em>2 to 2.5</em>. Hence, this value is close to Mohs scale hardness value of Gypsum therefore, gypsum is the correct answer.

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How might you think it is possible to convert from moles to particles or grams to particles?
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Explanation:

To convert moles to particles or grams to particles, let us have a firm understanding of what a mole is.

A mole is the unit of measuring quantity of particles.

It is the amount of substance that contains the Avogadro's number of particles.

The particle can be atoms, molecules, formula units, electrons, protons, neutrons, etc.

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    1 mole of a substance  contains 6.02 x 10²³ particles

To convert from grams to particles;

  First convert to moles;

        number of moles  = \frac{mass}{molar mass}  

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Answer:

Here's what I get

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