why is diamond clear and hard while graphite is soft?
Why is coal hard and chunky?
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Explanation:
- Diamond and graphite both only have carbons and have covalent bonding involved. ... 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.
- Coal is a combustible sedimentary rock occurring in rock strata in layers or veins called coal beds. Because of pressure and elevated temperature the carbon becomes hard and chunky.
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