Answer:
1.)In chemistry, an ionic compound is a chemical compound composed of ions held together by electrostatic forces termed ionic bonding. The compound is neutral overall, but consists of positively charged ions called cations and negatively charged ions called anions
2.)Scientific definitions for covalent bond
covalent bond. [ kō-vā′lənt ] A chemical bond formed when electrons are shared between two atoms. Usually each atom contributes one electron to form a pair of electrons that are shared by both atoms. See more at coordinate bond double bond polar bond.
3.)a soft black lustrous form of carbon that conducts electricity and is used in lead pencils and electrolytic anodes, as a lubricant, and as a moderator in nuclear reactors. 2 : a composite material in which carbon fibers are the reinforcing material.
4.)the smallest unit of weight in the avoirdupois, Troy, and apothecaries' systems, based on the average weight of a grain of wheat: in the avoirdupois system it equals 1/7000 of a pound, and in the Troy and apothecaries' systems it equals 1/5760 of a pound. 1 grain is equal to 0.0648 gramAbbreviation: gr.