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Why melting point of diamond is higher than that of silicon carbide?
Diamond is a covalent network solid, and those types of compounds have higher melting points than other types of compound.
Which mineral is the hardest known-to-man?
Diamond is still the hardest substance known to man. Various carbides such as tungsten carbide, boron carbide, and silicon carbide are also extremely hard, but you will notice that they all contain carbon (diamond is pure carbon - the rest are carbon compounds.)
What type of bond is in a diamond?
A diamond consists of covalent bonds between carbon atoms, where each carbon atom shares electrons with four neighboring carbon atoms to form a strong, three-dimensional network. This results in the diamond's hardness and durability.
What are diamonds soluble in and why?
Diamonds are not soluble in any liquid or substance due to their strong covalent bonds. The carbon-carbon bonds in diamonds are extremely stable, making them resistant to dissolution in most solvents.
Any impenetrably or unyielding hard substance?
Diamond is one of the hardest substances known, with a rating of 10 on the Mohs scale of mineral hardness. Other examples of hard substances include tungsten carbide and silicon carbide.
Why melting point of diamond is higher than that of silicon carbide?
Diamond is a covalent network solid, and those types of compounds have higher melting points than other types of compound.
What are the characteritics of covalent compounds?
Covalent compounds are formed by the sharing of electrons between atoms. They typically have lower melting and boiling points compared to ionic compounds. Covalent compounds are often insoluble in water and non-conductive in their solid state.
Which mineral is the hardest known-to-man?
Diamond is still the hardest substance known to man. Various carbides such as tungsten carbide, boron carbide, and silicon carbide are also extremely hard, but you will notice that they all contain carbon (diamond is pure carbon - the rest are carbon compounds.)
Why diamond has a higher melting point than silicon carbide?
The bond energy of Si -C is generally considered to be lower than that of the C-C, so a simple explanation is that diamond has a stronger bond. Both diamond and silicon carbide have a three dimensional network structure. Diamond consists of tetrahedral bonded carbon atoms whereas silicon carbide has many polymorphs (crystal structure which are temperature dependant). As you heat silicon carbide up the crystal structure changes. Silicon carbide does not melt "congruently" to give a liquid of the same composition, it decomposes at around 2700 0C .
Why are covalent compound volatile sublime?
There are some covalent compounds that are volatile and undergo sublimation such as iodine. Although, covalent compounds aren't always volatile. For example, diamond, the hardest solid known, does not change its phase even in a higher temperature around 3000 K.
Which type of bond forms compounds with distinctive shapes rather than forming massive crystals?
Covalent bond. Molecular compounds are formed by covalent bonds. Ionic bonds and metallic bonds form large crystal lattices (Some large crystals are covalent- like diamond)
Why are the melting and boiling points of covalent compounds lower than those of ionic compounds?
Molecular covalent compounds (where there are discrete molecules) have van der waals forces holding the molecules together in the solid and liquid phases. These forces are weak due to the small electrostatic charges involved as these originate in permanent or instantaneous dipoles. Ionic compounds are giant lattices where the ions are held together by electrostatic forces deriving fromthe relatively large charges on ions. It therefore takes more energy to break ionic lattices. NOTE that giant covalent molecules like diamond, silicon carbide also have high melting points. In these much energy is required to break the covalent bonds that hold the giant molecule together.
A brittle nonconducting solid might belong to which group?
A brittle nonconducting solid might belong to the group of covalent compounds, such as diamond or silicon dioxide. These compounds have strong covalent bonds that make them rigid and nonconducting of electricity.
Is wax a giant covalent?
No, wax contains very large molecules.
What does giant covalent mean?
Giant covalent structures are substances in which atoms are bonded together by strong covalent bonds in a continuous network, forming a three-dimensional structure. Examples include diamond, graphite, and silicon dioxide (silica). These substances typically have high melting points and are insoluble in most solvents.
What is the similaritie between diamond and iodine bond?
Both diamond and iodine bond are covalent bonds, where electrons are shared between atoms to form a stable chemical bond. Diamond consists of carbon atoms forming strong covalent bonds in a crystalline structure, while iodine forms covalent bonds with itself in diatomic form.
Which type of bond is considered the strongest?
Ionic compounds are said to be the compounds that form relatively stronger bonds. But there are exceptions such as diamond, graphite and carborundum which are covalent compounds.
