A Guyanese fisherman notices that the iron hull of his boat corrodes faster in seawater than in fresh river water. Which factor best explains this observation?

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Question

A Guyanese fisherman notices that the iron hull of his boat corrodes faster in seawater than in fresh river water. Which factor best explains this observation?

Accepted Answer

Seawater is an electrolyte due to dissolved salts — Award 1 mark for identifying that dissolved salts (mainly sodium chloride) increase the electrical conductivity of seawater, accelerating the electrochemical corrosion process. A is incorrect — oxygen content is similar; it is the ionic nature that accelerates corrosion. C is incorrect — temperature is not the primary factor. D is incorrect — density of iron is constant regardless of the surrounding medium.

Answer

Seawater is an electrolyte due to dissolved salts

Answer

Seawater contains more dissolved oxygen

Answer

Iron is less dense in seawater

Answer

Fresh water has a lower temperature

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One real Integrated Science question.
No signup. 30 seconds.