Your question: Why is diamond so hard Mcq?

Why the diamond is so hard?

The outermost shell of each carbon atom has four electrons. In diamond, these electrons are shared with four other carbon atoms to form very strong chemical bonds resulting in an extremely rigid tetrahedral crystal. It is this simple, tightly-bonded arrangement that makes diamond one of the hardest substances on Earth.

Why is diamond very hard in short?

The heat and pressure causes the diamonds molecules to change so that they’re so close together, the molecules can’t move (known as covalent bonding). The closeness of these molecules forms a rigid bond, therefore making the diamond hard.

Why is diamond hard 10th?

Diamond is hard because of the strong covalent bond between its carbon atoms forming a regular tetrahedron which is hard to break. … The various layers of the carbon atoms are far apart from each other; hence, the covalent bond cannot exist.

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Why is diamond hard and dense?

In a diamond, the carbon atoms are arranged tetrahedrally. … This accounts for diamond’s hardness, extraordinary strength and durability and gives diamond a higher density than graphite (3.514 grams per cubic centimeter). Because of its tetrahedral structure, diamond also shows a great resistance to compression.

What’s harder than diamond?

Moissanite, a naturally occurring silicon-carbide, is almost as hard as diamond. It is a rare mineral, discovered by the French chemist Henri Moissan in 1893 while examining rock samples from a meteor crater located in Canyon Diablo, Arizona. Hexagonal boron-nitride is 18% harder than diamond.

Why diamond is hard Quora?

Diamond is composed of pure carbon and the atomic bonding of the atoms makes it the hardest material. Extremely strong bonding makes diamond hardest among all other substances, but there is one direction where the bonds are not as strong and a diamond can be cleaved along this direction with impact.

Why is diamond hard class 11?

In diamond the octet of each carbon atom is completed. Structure of the diamond is a rigid three dimensional network. This causes high density and hardness to the diamond. Diamond is chemically inactive due to its rigid three dimensional structure.

Can you smash a diamond with a hammer?

As an example, you can scratch steel with a diamond, but you can easily shatter a diamond with a hammer. The diamond is hard, the hammer is strong. Whether something is hard or strong depends on its internal structure. … Diamonds, because of their lack of flexibility in the structure, are not actually very strong at all.

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Why is diamond so hard compared to graphite?

Diamond is harder than graphite because each of its carbon atoms form four covalent bonds in a tetrahedral structure and also due to the presence of strong covalent bonds in it. A chemical bond involving the exchange of electron pairs between atoms is known as a covalent bond.

Why diamond is bad conductor?

As we know diamond is a giant covalent structure i.e. each carbon atom is covalently bonded with other carbon atoms. So the four outermost electrons, four carbon atoms, are engaged or trapped in the covalent bonds which means that there are no free electrons. … So diamond is a bad conductor of electricity.

Why diamond is hardest and graphite is softest?

Graphite is soft because it has weak inter molecular forces between its layers. Diamond is hard due to its giant covalent lattice and it has many strong covalent bonds.

Which allotrope of carbon is softest?

Diamond is the hardest mineral known (10 on the Mohs scale), but graphite is one of the softest (1–2 on Mohs scale).

Why is diamond hard GCSE?

The rigid network of carbon atoms, held together by strong covalent bonds, makes diamond very hard. … Like silica, diamond has a very high melting point and it does not conduct electricity.

Why is diamond metastable?

Diamond and Graphite

Diamond is composed of the single element carbon, and it is the arrangement of the C atoms in the lattice that give diamond its amazing properties. … So diamond is said to be metastable, since it is kinetically stable, not thermodynamically stable.

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Why is diamond considered to be the hardest substance on Earth although it is made up of carbon just like graphite which is brittle explain?

While there are strong covalent bonds between carbon atoms in each layer, there are only weak forces between layers. This allows layers of carbon to slide over each other in graphite. … In this rigid network atoms cannot move. This explains why diamonds are so hard and have such a high melting point.