Exam 21: Metallurgy and the Chemistry of Metals

The following equation correctly represents the balanced chemical equation illustrating the thermite reaction.2Al(s) + Fe₂O₃(s) $\rarr$ Al₂O₃(s) + 2Fe(l)

Which of these ions is most likely to substitute for Ca²⁺ in the human body

Aluminum is an active metal, but does not corrode as iron does because

The Hall process involves the reduction of Al₂O₃ to aluminum by

The flotation process used in metallurgy involves

Cast iron as it is prepared in a blast furnace is a product of high purity.

Which of the following diagrams represents an insulator

Barite, anglesite, and epsomite are all examples of what type of mineral

Potassium superoxide, KO₂(s), is used in the breathing systems of biohazard suits. The following separate chemical equations show how KO₂(s) reacts with moisture and carbon dioxide in exhaled air to generate oxygen gas. 2KO₂(s) + 2H₂O(l) $\rarr$ 2KOH(aq) + O₂(g) + H₂O₂(aq) 4KO₂(s) + 2CO₂(g) $\rarr$ 2K₂CO₃(s) + 3O₂(g)

In the production of potassium metal, the source of electrons in the reduction of K⁺ ions is

Which one of these metals would normally be obtained by electrolytic reduction

For the reaction 3Fe(s) + C(s) $\rarr$ Fe₃C(s), $\Delta$ H ^$\circ$ = 21 kJ/mol and $\Delta$ S ^$\circ$ = 20.4 J/mol·K at 25 ^$\circ$ C. Estimate the minimum temperature above which the formation of cementite (Fe₃C) is favored.

The alkali metals listed in order of increasing melting point is consistent with which of the following

Write the chemical formula of corundum.

Alloys of iron that contain 1.0-1.5% carbon and some manganese, phosphorus, silicon, and sulfur are called

The chemical formula of magnetite can be expressed as either Fe₃O₄ or FeO $\times$ Fe₂O₃

Write the chemical formula of pyrite.

In the Hall process, ____________ is reduced ____________.

The following reaction is used to produce chromium metal at high temperature.Cr₂O₃(s) + 2Al(s) $\rarr$ 2Cr(l) + Al₂O₃(s) Which element is oxidized and which is reduced

The following two reactions represent the chemical reactions that can take place when magnesium is burned in air.2Mg(s) + O₂(g) $\rarr$ 2MgO(s) and 3Mg(s) + N₂(g) $\rarr$ Mg₃N₂(s)