Potassium Is a Very Reactive Metal

question 30

Multiple Choice

Potassium is a very reactive metal. Many of its compounds are not very reactive. For example, some class B fire extinguishers contain potassium bicarbonate as a dry powder for use in extinguishing burning liquids. Why is there such a difference in the reactivity of potassium in the bicarbonate salt and potassium that is a combustible metal?

• A) The difference in reactivity really is not that great to warrant an explanation.
• B) The potassium atom is bonded to an oxygen atom in the bicarbonate salt but is unbonded in the metal and free to react.
• C) The potassium metal possesses one additional electron that is easily transferred to other substances; the potassium in the bicarbonate salt already has lost this reactive electron.
• D) The potassium in the bicarbonate salt is a base, but the potassium metal is an acid.
• E) The potassium in the bicarbonate salt is an acid, but the potassium metal is a base.

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