QuestionJanuary 9, 2026

6. Chunk 6: Rust Formation Rust forms when iron reacts with oxygen and water, creating a new substance with different properties. Iron only Iron, oxygen, and water Iron and carbon dioxide Iron and heat

6. Chunk 6: Rust Formation Rust forms when iron reacts with oxygen and water, creating a new substance with different properties. Iron only Iron, oxygen, and water Iron and carbon dioxide Iron and heat
6. Chunk 6: Rust Formation Rust forms when iron reacts with oxygen and water, creating a new substance with different properties. Iron only Iron, oxygen, and water Iron and carbon dioxide Iron and heat

Solution
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Answer

B. Iron, oxygen, and water Explanation 1. Identify the Reactants in Rust Formation Rust is formed when iron reacts with both oxygen and water, not just iron alone or with carbon dioxide or heat. The chemical reaction involves iron (\mathrm{Fe}), oxygen (\mathrm{O_2}), and water (\mathrm{H_2O}). 2. Eliminate Incorrect Options "Iron only" is incorrect because rust requires more than just iron. "Iron and carbon dioxide" and "Iron and heat" do not produce rust. Only "Iron, oxygen, and water" correctly lists all reactants. 3. Select the Correct Option The correct answer must include iron, oxygen, and water as the substances involved in rust formation.

Explanation

1. Identify the Reactants in Rust Formation<br /> Rust is formed when iron reacts with both oxygen and water, not just iron alone or with carbon dioxide or heat. The chemical reaction involves iron ($\mathrm{Fe}$), oxygen ($\mathrm{O_2}$), and water ($\mathrm{H_2O}$).<br />2. Eliminate Incorrect Options<br /> "Iron only" is incorrect because rust requires more than just iron. "Iron and carbon dioxide" and "Iron and heat" do not produce rust. Only "Iron, oxygen, and water" correctly lists all reactants.<br />3. Select the Correct Option<br /> The correct answer must include iron, oxygen, and water as the substances involved in rust formation.
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