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KatRina [158]
3 years ago
10

Gary has a piece of diamond and a piece of graphite. He wants to test the hardness of these two minerals. When he rubs the diamo

nd against the piece of graphite, the graphite gets scratched. When he rubs the piece of graphite against the diamond, the diamond does not get scratched. Which of these is true? A. The graphite is harder than the diamond. B. This test does not show which mineral is harder. C. The diamond is harder than the graphite. D. Both minerals have the same hardness.
Biology
2 answers:
lutik1710 [3]3 years ago
8 0
C ) The diamond is harder than graphite !!
otez555 [7]3 years ago
5 0

Answer:

Option (C)

Explanation:

The hardness of any material depends upon the type of chemical bonds and the energy requires to break that bond. Diamond and graphite has covalent bonding between their carbon atoms.

Gary rubs the diamond the graphite piece is scratched because diamond has strong covalent bonding then graphite. The bond energy of diamond is much higher than graphite. Gary rubs the piece of graphite against diamond, diamond doesn't scratch because diamond is harder than graphite.

Thus, the correct answer is option (C).

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just olya [345]

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Similarly, Rh trait is determined by the presence or absence of rhesus antigen in the erythrocytes. Rhesus antigen is an antigen first discovered in rhesus monkey. Rh+ indicates the presence of rhesus antigen in the red blood cells while Rh- indicates the absence of rhesus antigen in the red blood cells.

6 0
3 years ago
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so what's the question here??

8 0
2 years ago
_________is severe pain and constriction about the heart, usually radiating to the left shoulder and down the left arm and creat
White raven [17]

Answer:

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Explanation:

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3 years ago
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Which mitotically inactive portion of the root tip acts as a reserve of healthy cells in case the apical meristem becomes damage
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The quiescent center is the mitotically inactive portion of the root tip that acts as a reserve of healthy cells in case the apical meristem becomes damaged.

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The root quiescent center is a pool of rarely dividing stem cells inside the root apical meristem. The Quiescent center maintains the environment more regularly by dividing initials, forming the root apical meristem cell niche.

To learn more about the quiescent center: brainly.com/question/411841

#SPJ4

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2 years ago
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