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Define the term Covalent Bond

A covalent bond is formed by a shared pair of electrons between two atoms.

Answered by Rex O. • Chemistry tutor

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You added 75cm^3 of 0.5moldm^-3 HCl to impure MgCO2, and some was left unreacted. The unreacted HCl reacted completely with 21.6cm^m of 0.5moldm^-3 NaOH. So what is the percentage purity of the MgCO3 sample?

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