Yes.... they are very strong, and almost impossible to break. Diamond is an example of a compound made up of covalently bonded carbons
Breaking bonds requires energy.
Breaking covalent bonds throughout the solid would be required to melt a network solid.
If all the bonds involved in the reaction are ionic, the reaction occurs in solution, and no new covalent bonds need to be formed, the reaction would usually be faster than an average reaction that requires breaking covalent bonds. However, there are many exceptions. For example, reactions of elemental fluorine with almost anything else, which require breaking of fluorine to fluorine covalent bonds, are usually very fast.
no. melting is a physical change and does not involve breaking of covalent bonds
Yes it does
To break bonds you must provide an external source of energy.
breaking covalent bonds
Because the covalent bonds between the atoms are strong and require a lot of energy to break.
No, energy is consumed.
Ionic bonds are stronger than covalent bonds and therefore require more energy to break.
As a generalization, ionic bonds are much stronger than covalent bonds.
breaking the bonds in a disaccharide/ polysaccharide