This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.

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Here are the answers for Question 3:
3.1 Hydrogen Hydrogen is an element. It cannot be broken down into different elements.
3.2 Water Water is a compound. It can be broken down into different elements: Hydrogen and Oxygen.
3.3 Iron Iron is an element. It cannot be broken down into different elements.
3.4 Sulfur dioxide Sulfur dioxide is a compound. It can be broken down into different elements: Sulfur and Oxygen.
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3.1 Hydrogen Hydrogen is an element. It cannot be broken down into different elements.
This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.