QCAA Marine Science EA Practice Questions - QCAA Marine Science External Assessment (Queensland) Exam

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When atmospheric carbon dioxide (CO2) dissolves into surface ocean waters, which sequence of chemical reactions primarily causes ocean acidification?

CO2 reacts with NaCl to release free chlorine gas and carbonate ions CO2 reacts with H2O to form carbonic acid (H2CO3), which dissociates into H+ and bicarbonate ions (HCO3-) CO2 combines with dissolved oxygen to form ozone, lowering water temperature CO2 reacts with ammonia to form nitrate ions, consuming all hydroxide ions

Correct Answer:

CO2 reacts with H2O to form carbonic acid (H2CO3), which dissociates into H+ and bicarbonate ions (HCO3-)

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