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A covalent bond is a type of chemical bond where two atoms share one or more pairs of electrons in order to achieve a stable electron configuration.
A substance is likely to have covalent bonds if it is composed of non-metal elements, and if it has a low melting and boiling point, as these properties are indicative of weak bonds between molecules.
Yes, SiO2 (silicon dioxide) is covalently bonded. Silicon and oxygen are both non-metal elements, and SiO2 has a melting point of 1713°C and a boiling point of 2230°C, which are relatively low temperatures compared to ionic compounds.
Yes, C6H12O6 (glucose) is also covalently bonded. Carbon, hydrogen, and oxygen are all non-metal elements, and glucose has a melting point of 146°C and a boiling point of 295°C, again indicating weak bonds between molecules.
Yes, it is possible for a substance to have both covalent and ionic bonds. For example, a molecule of sodium chloride (NaCl) has both covalent bonds within the chlorine molecule and ionic bonds between sodium and chlorine atoms.