Question 1

Write the equation for the initial treatment of titanium ore. A)TiO₂(s)+ Cl₂(g)+ C(s)→ TiCl₂(g)+ CO₂(g) B)TiCl₄(s)+ 2 H₂O(l)→ TiO₂(g)+ HCl(g) C)TiO₂(s)+ 2 Cl₂(g)+ C(s)→ TiCl₄(g)+ 2 CO(g) D)Ti(s)+ 2 Cl₂(g)→ TiCl₄(g) E)TiS(s)+ 2H₂O(l)→ TiO₂(g)+ 2 H₂S(g)

Accepted Answer

The equation shows the initial treatment of titanium ore. It involves reacting titanium oxide (TiO2) with chlorine gas (Cl2) and carbon (C) to form titanium tetrachloride (TiCl4) and carbon monoxide (CO). This is the most common method of extracting titanium from its ore. The other options either do not involve the initial treatment of titanium ore or are not commonly used methods.

Question 2

Which of the following is amphoteric? A)V₂O₅ B)CrO C)Al(H₂O)₆³⁺ D)Fe(H₂O)₆³⁺

Accepted Answer

The answer of Which of the following is amphoteric? A)V₂O₅ B)CrO C)Al(H₂O)₆³⁺ D)Fe(H₂O)₆³⁺...

Question 3

Choose the INCORRECT statement about metallurgy. A)Zone refining is refining to a certain zone of purity. B)Refining is the removal of impurities from a metal. C)The Kroll process uses Mg to reduce TiCl₄ to titanium. D)Zone refining uses a heating coil which passes along the rod of material. E)In zone refining impurities remain in the molten area.

Accepted Answer

Zone refining is not about refining to a certain zone of purity; it is a method used to purify metals by moving a molten zone through the material, causing impurities to concentrate in the molten region and move along with it.

Question 4

An iron plate of 0.559 m² surface area is to be chrome plated using a chromic acid-sulfuric acid plating bath.The anode and cathode half-equations are: Cathode: Cr₂O₇^2-(aq)+ 14 H⁺(aq)+ 12 e^- → 2 Cr(s)+ 7 H₂O(l)E° = 0.320 V Anode: 2 H₂O(l)→ O₂(g)+ 4 H⁺(aq)+ 4 e^- E° = 1.229 V Determine the minimum energy needed to produce a plating 0.115 mm thick on the iron plate.The density of chromium is 7.19 g/cm³. A)526 kJ B)780 kJ C)1.05 × 10³ kJ D)4.68 × 10³ kJ E)9.36 × 10³ kJ

Accepted Answer

The answer of An iron plate of 0.559 m² surface...

Question 5

MnO₄^-(aq)produces what manganese-containing species when used as an oxidizing agent in weakly basic solution? A)MnO₄^2- B)Mn C)Mn²⁺ D)Mn₂O₃ E)MnO₂

Accepted Answer

In weakly basic solutions, MnO₄⁻ is reduced to MnO₂ when it acts as an oxidizing agent.

Question 6

Choose the INCORRECT statement.
A)Hydrometallurgy handles materials as aqueous solutions.
B)The three steps of hydrometallurgy are leaching,purification and/or concentration and precipitation.
C)Leaching is adding chemicals to eat away the ore,leaving the metal.
D)Purification in hydrometallurgy is to remove impurities and concentrate solutions.
E)Purification in hydrometallurgy may include evaporation of water,ion exchange,and/or use of activated charcoal.

Accepted Answer

Leaching involves adding chemicals to dissolve the desired metal from the ore, not to eat away the ore.

Question 7

Choose the INCORRECT statement. A)Titanium is valued for its low density,high structural strength and corrosion resistance. B)Titanium chloride is the most widely used white pigment for paints. C)Chromium is often used to plate other metals for decorative purposes. D)Dichromate is Cr₂O₇^2-. E)Chromate is CrO₄^2-.

Accepted Answer

Titanium dioxide (TiO2), not titanium chloride, is the most widely used white pigment for paints.

Question 8

Choose the INCORRECT statement.
A)The extraction of copper is complicated by iron.
B)Blister copper has bubbles of air on the surface of the copper.
C)Refining to high purity copper is done electrolytically.
D)Pyrometallurgy is the roasting of an ore followed by reduction of the ore to metal.
E)"Pyro" as a prefix indicates high temperatures.

Accepted Answer

Blister copper has bubbles of sulfur dioxide, not air, on its surface due to the oxidation of sulfur during the smelting process.

Question 9

If an aqueous solution is prepared by dissolving 1.6 mol Na₂CrO₄ in 1.0 L of a buffer at pH 8.24,what will be [Cr₂O₇^2-] in the solution? The resultant equilibria are: HCrO₄^-(aq)⇌ H⁺(aq)+ CrO₄^2-(aq)K_a = 3.2 × 10^-7 2 HCrO₄^-(aq)⇌ Cr₂O₇^2-(aq)+ H₂O(l)K = 33 A)9.9 × 10^-5 M B)2.9 × 10^-28 M C)8.9 × 10^-9 M D)8.6 × 10² M E)2.8 × 10^-2 M

Accepted Answer

The answer of If an aqueous solution is prepared by...

Question 10

At 273 K,ΔG° for the reaction 2 C(s)+ O₂(g)→ 2 CO(g) Is about -280 kJ,and at 1480 K is about -580 kJ. For the reaction 2 Zn(s)+ O₂(g)→ 2 ZnO(s) ΔG° at 273 K and 1480 K,respectively,is -640 and -280 kJ.Calculate ΔG° at 273 K and 1480 K,respectively,for the reduction of zinc oxide by carbon. A)+180 and -150 kJ B)+360 and -300 kJ C)-360 and +300 kJ D)-180 and +150 kJ

Accepted Answer

The reduction of zinc oxide by carbon can be represented as:2 ZnO(s) + 2 C(s) → 2 Zn(s) + 2 CO(g)To find ΔG° for this reaction, we use the given ΔG° values for the reactions:1. 2 C(s) + O2(g) → 2 CO(g)2. 2 Zn(s) + O2(g) → 2 ZnO(s)At 273 K:ΔG° = ΔG°(2 C + O2 → 2 CO) - ΔG°(2 Zn + O2 → 2 ZnO)= (-280 kJ) - (-640 kJ) = +360 kJAt 1480 K:ΔG° = ΔG°(2 C + O2 → 2 CO) - ΔG°(2 Zn + O2 → 2 ZnO)= (-580 kJ) - (-280 kJ) = -300 kJTherefore, the correct choice is A: +180 and -150 kJ.

Question 11

What volume of carbon monoxide,measured at 1200 °C and 720 Torr,would be released when 5.0 kg of an ore containing 45% zinc oxide as the only reacting species is treated with excess carbon? [ZnO(s)+ C(s)→ Zn(s)+ CO(g)] A)1.2 × 10² L B)1.5 × 10³ L C)3.5 × 10³ L D)7.8 × 10³ L E)7.0 × 1 0⁴ L

Accepted Answer

Step 1: Calculate the moles of ZnO in 5.0 kg of the ore.

Mass of ZnO = 0.45 x 5.0 kg = 2.25 kg

Moles of ZnO = (2.25 kg / 81.39 g/mol) = 0.02766 mol

Step 2: From the balanced chemical equation, it is clear that 1 mol of ZnO produces 1 mol of CO. Therefore, the number of moles of CO produced will also be 0.02766 mol.

Step 3: Calculate the volume of CO at the given conditions of temperature and pressure using the ideal gas law:

PV = nRT

V = (nRT) / P

V = [(0.02766 mol) (0.08206 L atm/mol K) (1473 K)] / (720 Torr)

V = 3.47 L or 3.5 x 10^3 mL

Therefore, the volume of CO released will be 3.5 x 10^3 mL or 3.5 L, which corresponds to choice (C).

Question 12

What are the formulas of the missing compounds,1 and 2,respectively,in the reaction below? This reaction is used in the production of metallic zinc. ZnO(s)+ 1 → Zn(g)+ 2 A)C(s)and CO(g) B)CO(g)and ZnCO₃(s) C)CO(g)and C(s) D)C(s)and CO₂(g)

Accepted Answer

The reaction for the production of metallic zinc involves the reduction of zinc oxide (ZnO) with carbon (C) to produce zinc (Zn) and carbon monoxide (CO). Therefore, the missing compounds are carbon (C) as the reducing agent and carbon monoxide (CO) as the byproduct.

Question 13

Choose the INCORRECT statement.
A)The product of a blast furnace is pig iron.
B)Cast iron is pig iron poured directly into molds.
C)Pig iron is converted to steel by reducing the carbon content,removing Si,Mn,P,and other impurities,and adding alloying elements.
D)The most important method of steel-making today is the basic oxygen process.
E)In the basic oxygen process,oxygen is bubbled into the blast furnace.

Accepted Answer

Oxygen is not bubbled into the blast furnace in the basic oxygen process, but rather into a vessel called a converter.

Question 14

Choose the INCORRECT statement.
A)In steel making,DRI stands for Detection and Recovery of Iron.
B)In the basic oxygen process,a lance is a water cooled tube to deliver limestone and oxygen.
C)Alloying elements with steel include Cr,Ni,Mn,V,Mo and W.
D)The direct reduction of iron depends on the availability of natural gas.
E)Steel is an alloy of iron.

Accepted Answer

DRI stands for Direct Reduced Iron, not Detection and Recovery of Iron.

Question 15

Choose the INCORRECT statement. A)Iron is the most widely used metal from the earth's crust. B)The simplified equation for the reduction of iron is Fe₂O₃(s)+ 3 CO(g)→ 2 Fe(l)+ 3 CO₂(g). C)One process in the making of steel from pig iron is to reduce the carbon content. D)The product of a blast furnace is steel. E)The solid reactants in a blast furnace are iron ore,coke,and a slag-forming flux.

Accepted Answer

The product of a blast furnace is not steel. It is actually pig iron, which is further processed to make steel.

Question 16

Which of the following forms a colorless aqueous solution? A)CuClO₄ B)CoSO₄ C)NiCl₂ D)FeCl₃

Accepted Answer

CuClO₄ is a colorless aqueous solution because the Cu²⁺ ion is not colored and the ClO₄^- ion is a weak ligand that does not form colored complexes with Cu²⁺.

Question 17

Order the following compounds from acidic to basic,with the most acidic on the left. CrO,Cr₂O₃,CrO₃ A)CrO₃ > Cr₂O₃ > CrO B)CrO₃ > CrO > Cr₂O₃ C)Cr₂O₃ > CrO₃ > CrO D)CrO > Cr₂O₃ > CrO₃

Accepted Answer

CrO3 is the most acidic as it is a higher oxidation state oxide of chromium, Cr2O3 is amphoteric, and CrO is basic.

Question 18

Which of the following definitions is INCORRECT?
A)amalgam: a solid solution or alloy containing mercury
B)coinage metals: the transition elements of Group 11 (1B)
C)galvanized iron: iron which has been electroplated with tin
D)lanthanides: elements of atomic number 58 through 71
E)pig iron: slightly impure iron as obtained directly from the blast furnace

Accepted Answer

Galvanized iron refers to iron that has been coated with zinc, not tin.

Question 19

The main source of titanium is: A)seawater B)rutile ore,TiO₂ C)oxide ores D)TiS₂ E)atmospheric gases

Accepted Answer

Rutile ore is the main source of titanium. While titanium can also be found in other forms such as oxide ores, the largest and most commonly used source is rutile ore. Seawater and atmospheric gases do contain trace amounts of titanium, but not in significant enough quantities to be considered a viable source of the metal. TiS₂ is not a legitimate chemical compound.

Question 20

Find the FALSE combination of a metallurgical process and its example: A)leaching: 4 Au(s)+ 8 CN^-(aq)+ O₂(g)+ 2 H₂O(l)→ 4 [Au(CN)₂]^-(aq)+ 4 OH^-(aq) B)reduction: ZnCO₃(s)→ ZnO(s)+ CO₂(g) C)roasting: 2 Cu₂S(s)+ 3 O₂(g)→ 2 Cu₂O(s)+ 2 SO₂(g) D)precipitation: Zn²⁺(aq)+ S^2-(aq)→ ZnS(s) E)conversion: 2 Co(OH)₃(s) Co₂O₃(s)+ 3 H₂O(g)

Accepted Answer

The answer of Find the FALSE combination of a metallurgical...

Quiz 23: The Transition Elements

Write the equation for the initial treatment of titanium ore.

Which of the following is amphoteric?

Choose the INCORRECT statement about metallurgy.

MnO₄^-(aq) produces what manganese-containing species when used as an oxidizing agent in weakly basic solution?

Choose the INCORRECT statement.

Choose the INCORRECT statement.

Choose the INCORRECT statement.

If an aqueous solution is prepared by dissolving 1.6 mol Na₂CrO₄ in 1.0 L of a buffer at pH 8.24,what will be [Cr₂O₇^2-] in the solution? The resultant equilibria are: HCrO₄^-(aq) ⇌ H⁺(aq) + CrO₄^2-(aq) K_a = 3.2 × 10^-7 2 HCrO₄^-(aq) ⇌ Cr₂O₇^2-(aq) + H₂O(l) K = 33

What volume of carbon monoxide,measured at 1200 °C and 720 Torr,would be released when 5.0 kg of an ore containing 45% zinc oxide as the only reacting species is treated with excess carbon? [ZnO(s) + C(s) → Zn(s) + CO(g) ]

What are the formulas of the missing compounds,1 and 2,respectively,in the reaction below? This reaction is used in the production of metallic zinc. ZnO(s) + 1 → Zn(g) + 2

Choose the INCORRECT statement.

Choose the INCORRECT statement.

Choose the INCORRECT statement.

Which of the following forms a colorless aqueous solution?

Order the following compounds from acidic to basic,with the most acidic on the left. CrO,Cr₂O₃,CrO₃

Which of the following definitions is INCORRECT?

The main source of titanium is:

Find the FALSE combination of a metallurgical process and its example:

Quiz 23: The Transition Elements

Write the equation for the initial treatment of titanium ore.

Which of the following is amphoteric?

Choose the INCORRECT statement about metallurgy.

MnO4-(aq) produces what manganese-containing species when used as an oxidizing agent in weakly basic solution?

Choose the INCORRECT statement.

Choose the INCORRECT statement.

Choose the INCORRECT statement.

If an aqueous solution is prepared by dissolving 1.6 mol Na2CrO4 in 1.0 L of a buffer at pH 8.24,what will be [Cr2O72-] in the solution? The resultant equilibria are: HCrO4-(aq) ⇌ H+(aq) + CrO42-(aq) Ka = 3.2 × 10-7 2 HCrO4-(aq) ⇌ Cr2O72-(aq) + H2O(l) K = 33

What volume of carbon monoxide,measured at 1200 °C and 720 Torr,would be released when 5.0 kg of an ore containing 45% zinc oxide as the only reacting species is treated with excess carbon? [ZnO(s) + C(s) → Zn(s) + CO(g) ]

What are the formulas of the missing compounds,1 and 2,respectively,in the reaction below? This reaction is used in the production of metallic zinc. ZnO(s) + 1 → Zn(g) + 2

Choose the INCORRECT statement.

Choose the INCORRECT statement.

Choose the INCORRECT statement.

Which of the following forms a colorless aqueous solution?

Order the following compounds from acidic to basic,with the most acidic on the left. CrO,Cr2O3,CrO3

Which of the following definitions is INCORRECT?

The main source of titanium is:

Find the FALSE combination of a metallurgical process and its example:

MnO₄^-(aq) produces what manganese-containing species when used as an oxidizing agent in weakly basic solution?

If an aqueous solution is prepared by dissolving 1.6 mol Na₂CrO₄ in 1.0 L of a buffer at pH 8.24,what will be [Cr₂O₇^2-] in the solution? The resultant equilibria are: HCrO₄^-(aq) ⇌ H⁺(aq) + CrO₄^2-(aq) K_a = 3.2 × 10^-7 2 HCrO₄^-(aq) ⇌ Cr₂O₇^2-(aq) + H₂O(l) K = 33

Order the following compounds from acidic to basic,with the most acidic on the left. CrO,Cr₂O₃,CrO₃