Write balanced chemical equations for the following reactions.
(a) The reaction of aluminum and iron(III) oxide to form iron and aluminum oxide (known as the thermite reaction).
(b) The reaction of carbon and water at high temperature to form a mixture of gaseous CO and H₂ (known as water gas and once used as a fuel).
(c) The reaction of liquid silicon tetrachloride and magnesium forming silicon and magnesium chloride. This is one step in the preparation of ultrapure silicon used in the semiconductor industry.

Data given in Example 3.1

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EXAMPLE 3.1 Balancing an Equation for a Combustion Reaction Problem Write the balanced equation for the combustion of ammonia gas (NH3) to give water vapor and nitrogen monoxide gas (NO). What Do You Know? You know the correct formulas and/or names for the reac- tants (NH3 and oxygen, O₂) and the products (H₂O and nitrogen monoxide, NO). You also know their states. Strategy First write the unbalanced equation. Next balance the N atoms, then the H atoms, and finally the O atoms.