* not completed

. In the reaction: 2Mg + O₂ 2MgO

Magnesium is the reducing agent and is oxidized by oxygen. correct incorrect

Magnesium is the oxidizing agent and is reduced by oxygen. correct incorrect

Oxygen is the reducing agent and is oxidized by magnesium. correct incorrect

* not completed

. Half-reactions:

are conceptual halves of one process and are written to show oxidation and reduction more clearly correct incorrect

represent oxidation reactions only correct incorrect

represent reduction reactions only correct incorrect

* not completed

. A redox reaction is spontaneous when:

E⁰ = 0 correct incorrect

E⁰ > 0 correct incorrect

E⁰ < 0 correct incorrect

* not completed

. In an Ox/Red couple:

"Ox" is strongly oxidizing if the E⁰ is strongly positive. correct incorrect

"Ox" is strongly oxidizing if the E⁰ is strongly negative. correct incorrect

"Red" is strongly reducing if the E⁰ is strongly positive. correct incorrect

* not completed

. The stability field of water shows:

the region of pH and reduction potential where couples are oxidized by hydrogen ions but cannot reduce hydrogen ions correct incorrect

the region of pH and reduction potential where couples are not oxidized by hydrogen ions but can reduce hydrogen ions correct incorrect

the region of pH and reduction potential where couples neither are oxidized by hydrogen ions nor reduce hydrogen ions correct incorrect

* not completed

. The E^o of the Fe³⁺/Fe²⁺ couple is equal to +0.77 V. If a solution containing Fe²⁺ is exposed to air, and if O₂(g)/H₂O(l) and H⁺(aq)/H₂(g) reduction potentials are +1.23 V and 0.00 V respectively, then:

The Fe²⁺ will remain unchanged because its E^o is in the stability field of water. correct incorrect

The Fe²⁺ will slowly be oxidized to Fe³⁺ by atmospheric oxygen. correct incorrect

Fe²⁺ will slowly and spontaneously oxidize H⁺ to H₂. correct incorrect

* not completed

. Which statement is the correct one?

Comproportionation is a redox reaction in which the oxidation number of an element is simultaneously raised and lowered. Disproportionation is the opposite of comproportionation. correct incorrect

Disproportionation is a reaction in which the oxidation number of an element is raised. Comproportionation is a reaction in which the oxidation number of an element is lowered. correct incorrect

Disproportionation is a redox reaction in which the oxidation number of an element is simultaneously raised and lowered. Comproportionation is the opposite of disproportionation. correct incorrect

* not completed

. Which statement is correct in reference to the Ellingham diagram?

For temperatures at which the C/CO line lies above the metal oxide line, C can be used to reduce the metal oxide. The C is oxidized to CO. correct incorrect

For temperatures at which the C/CO line lies below the metal oxide line, C can be used to reduce the metal oxide. The C is oxidized to CO. correct incorrect

For temperatures at which the CO/CO₂ line lies below the metal oxide line, C can be used to reduce the metal oxide. The C is oxidized to CO. correct incorrect

* not completed

. Find the correct statement concerning the Latimer diagrams:

Latimer diagrams are also called oxidation diagrams correct incorrect

The data from the Latimer diagrams cannot be used when calculating the standard potentials of redox reactions. correct incorrect

Latimer diagram contains different chemical species of an element with the most highly oxidized species on the left and the most reduced species of the element on the right correct incorrect

* not completed

. Identify the correct statement:

Iron and copper are extracted from their ores by electrochemical reduction; aluminum is extracted by chemical reduction. correct incorrect

Aluminium and copper are extracted from their ores by electrochemical reduction; iron is extracted by chemical reduction. correct incorrect

Aluminium is extracted from its ore by electrochemical reduction; iron and copper are extracted by chemical reduction. correct incorrect