GROWTH DEVELOPMENT CHILD
SUMMATIVE ASSESSMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Iron, oxygen, water
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Steel, oxygen, acid
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Iron, salt and water
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None of the above
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Detailed explanation-1: -The chemical equation for rusting of Iron is: Iron(Fe) + Oxygen(O2) + Water(H2O) → rust(Iron OxideFe2O3)
Detailed explanation-2: -Three things must be present for rusting to occur: iron, oxygen, and water. Rust forms when these three elements combine and create an electrochemical reaction. iron + water + oxygen → hydrated iron(III) oxide.
Detailed explanation-3: -Rusting is an oxidation reaction. The iron reacts with water and oxygen to form hydrated iron(III) oxide, which we see as rust. Iron and steel rust when they come into contact with water and oxygen – both are needed for rusting to occur.
Detailed explanation-4: -The exposure of iron (or an alloy of iron) to oxygen in the presence of moisture leads to the formation of rust.