Using Hydrogen (H₂) to Reduce Magnetite (Fe₃O₄) to Iron (Fe)

question 32

Multiple Choice

Using hydrogen (H₂) to reduce magnetite (Fe₃O₄) to iron (Fe) is considered to be "greener" than using carbon monoxide (CO) because

• A) there are more molecules of the CO₂ by-products produced than molecules of the water by-product.
• B) water contributes less to climate change than carbon dioxide does.
• C) using hydrogen uses much less energy than using carbon monoxide does.
• D) the iron produced by using hydrogen can be replaced by aluminum more easily.

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Definitions:

Production Based

A method or approach that focuses on enhancing the efficiency and output of the manufacturing process, often measured against set production targets.

Straight-Line

A method of allocating the cost of an asset evenly over its useful life for the purposes of depreciation or amortization.

Declining-Balance

A method of depreciation where an asset loses value at a rate that decreases over time, opposite of straight-line depreciation.

Useful Life

The estimated duration of time an asset is expected to be useful and productive for the purpose it was acquired.