Chemical Bonds

Science — First Preparatory

Applications and examples from life

Comparison aspect	Main idea	Keywords
The salt we eat	sodium chloride is an ionic compound. That is why it has a high melting point and dissolves in water separating into its ions	sodiumchlorideioniccompound
The water we drink	a water molecule is a covalent compound with one oxygen atom sharing electrons with two hydrogen atoms. For this reason water is not split into its elements by ordinary heating	moleculecovalentcompoundoxygen
The oxygen we breathe	an oxygen molecule O₂ contains a double covalent bond. Breaking that bond needs energy which living organisms use in respiration	moleculecontainsdoublecovalent

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