i) ii) Steel essentially contains a) 80% or more iron b) 50% or more iron c) Alloying elements like chromium, tungsten, nickel and copper d) Elements like phosphorous, sulfur and silicon in varying quantities At room temperature, steel is mostly -------- with patches of - a) Ferrite, austenite b) Austenite, ferrite c) Ferrite, pearlite d) Austenite, cementite iii) Nickel in steel a) Improves wear resistance, cutting ability and toughness b) Refines grain size and improves heat resistant properties c) Improves cutting ability and reduces hardening d) Gives ductility, toughness, tensile strength and anticorrosion properties

i) ii) Steel essentially contains a) 80% or more iron b) 50% or more iron c) Alloying elements like chromium, tungsten, nickel and copper d) Elements like phosphorous, sulfur and silicon in varying quantities At room temperature, steel is mostly -------- with patches of - a) Ferrite, austenite b) Austenite, ferrite c) Ferrite, pearlite d) Austenite, cementite iii) Nickel in steel a) Improves wear resistance, cutting ability and toughness b) Refines grain size and improves heat resistant properties c) Improves cutting ability and reduces hardening d) Gives ductility, toughness, tensile strength and anticorrosion properties

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter4: Energy And Chemical Reactions

Section: Chapter Questions

Problem 73QRT: Three reactions very important to the semiconductor industry are The reduction of silicon dioxide to...

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Three reactions very important to the semiconductor industry are The reduction of silicon dioxide to crude silicon, SiO2(s) + 2 C(s) → Si(s) + 2 CO(g) ΔrH° = 689.9 kJ/mol The formation of silicon tetrachloride from crude silicon, Si(s) + 2 Cl2(g) → SiCl4(g) ΔrH° = −657.01 kJ/mol The reduction of silicon tetrachloride to pure silicon with magnesium, SiCl4(g) + 2 Mg(s) → 2 MgCl2(s) + Si(s) ΔrH° = −625.6 kJ/mol Calculate the overall enthalpy change when 1.00 mol sand, SiO2, changes into very pure silicon by this series of reactions.
Aluminum is produced commercially by the electrolysis of Al2O3 in the presence of a molten salt. If a plant has a continuous capacity of 1.00 million A, what mass of aluminum can be produced in 2.00 h?
Aluminum is the most abundant metal in the earth’s crust. It is also a common household utensilmetal. The extraction of Aluminum from its ore is expensive because the metallurgy uses a veryhigh amount of electricity. The extraction of Aluminum metal takes place in a number of steps,which may be summarized below.Step 1: Washing and mechanical processes employed to the ore to remove basic impurities.Step 2: Conversion of Aluminum ore (Bauxite) to powdered Alumina (Al2O3) by reaction withconcentrated NaOH solution.Step 3: Dissolving Alumina in molten Cryolite(Na3AlF6)Step 4: Electrolytic refining of the solution at step 2. (Diagram below) to form pure Aluminummetal.Step 5: Collecting pure molten Aluminum at the cathode, which change later to solid Aluminummetal.As you observed, many changes are taking place in different steps for the above extractionprocess. Classify them as physical or chemical change and explain why?a) Step 1 __________________________________________b) Step 2…
Consider the smelting of iron ore which consists of Fe2O3 and Fe3O4. If Fe is produced in the pig iron, and FeO is produced in the slag, what are the chemical equations involved?
A sample of pig iron contains 3.4 % C, 2% Si, 2% P. The remainder being iron. Discussbriefly how steel can be manufactured from such a sample.
A 6.35 kg mixed-mineral sample contains chromite (FeCr2O4) as the only chromium-bearing ore. The sample is subjected to an industrial process, using a ferrosilicon alloy as a reducing agent, which quantitatively converts all of the chromium into 12.5 kg of a ferrochrome alloy (stainless steel) which is 15.4% Cr by mass. What is the percentage of chromite (FeCr2O4) in the original sample?
Many important metals occur as sulfide, arsenide, and antimonide minerals, especially in the Sudburymineral complex. The first step in processing these ores involves “roasting” the ore in air to produce the metalor metal oxide, along with nonmetal oxides that can be serious pollutants if not trapped.Suppose that you roast 1.00 kg of the mineral maucherite, Ni11As8. The balanced equation for thereaction is:2 Ni11As8 + 31 O2 → 22 NiO + 8 As2O5(a) How many kg of NiO can be produced?(b) How many kg of the pollutant As2O5 can be produced?(c) How many liters of air at 25°C are required for roasting? Assume that air contains 23% O2 by mass,and that the density of air at 25°C is 1.2 g/L.Molar masses: Ni11As8 1245.0 g/mol NiO 74.69 g/mol As2O5 229.84 g/mol
Name the chief ores of aluminium and zinc.
what are the most common minerals found in soils are combinations of which four elements, which are also the most common elements.
Explain the different production process of advanced materials like carbon filter, ceramics, and micro alloys
Can all minerals of a metal act as ores? Justify.
An element "A" with an atomic weight of 39.23 g/mol is added to a pure element of "Z" with an atomic weight of 21.39 to form an alloy of 81 wt% element "A" and 19 wt% element "Z". Determine the percent atom compositions of both elements in the alloy.