Cecil writes the equation for the reaction of hydrogen and oxygen below. H2 + O2 → H2O Why does his teacher ask him to balance the equation by including the correct coefficients? to show that most molecules exist in pairs to show that most compounds exist in pairs to show that atoms are conserved in chemical reactions to show that atoms are created in chemical reactions

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ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called

sound moves fastest in solids because the molecules are tightly packed and it allows sound to vibrate

segmented body, an exoskeleton made from chitin, and joint appendages.