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A type of cast iron containing 3-4 wt% C and 1-3 wt% Si.
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- Which of the following statements is false? a. Stainless steel contains chromium and nickel, which form protective oxide coatings. b. Galvanized steel is coated with zinc to form an oxide coating. c. Cathodic protection is a method used to protect steel in buried tanks and pipelines. d. Chromium and tin are often used to plate steel by forming a durable oxide coating. e. All of these are true.A steel model was cooled down from 1000°C. a. Find the composition of the steel, if, at 800°C the model contains austenite and ferrite at a ratio of 1:3. b. Calculate the relative amounts of cementite and ferrite at room temperature (X-95.6%).A sample of an iron alloy contains 87.7 g Fe, 2.60 g C, and 1.52 g Cr . Calculate the percent by mass of each component present in the alloy sample. _____%Fe ______%C ______%Cr
- Steels 2. This steel is used in railway wheels and tracks, gears, and crankshafts. * O High carbon steel O Low carbon steel Medium carbon steel Stainless steel 18. These are used in wide variety of applications owing to the properties like good fluidity, ease of casting, low shrinkage, excellent machinability, wear resistance and damping capacity.A. Clean and carefully weigh 2 strips of Cu, 2 strips of Fe, and a strip of Zn. Connect 1Cu strip and 1Fe strip together. Place them in a beaker containing salt water. Connect another Fe strip to one end of a Zn wire. Connect the other Cu strip to the other end of the same Cu wire. Place the connected strips in another beaker containing the same concentration of salt water. Set the mixtures aside for a couple of days. Wash the strips. Dry them. Weigh each strip. Determine the gain or loss of mass in each strip. Explain results2. Materials Properties and Bonding a. What is the grain boundary? Grain boundary density increase will decrease the strength values, is this correct? What is the difference between a low angle grain boundary and a high angle grain boundary? Draw pictures. b. If a material has equiaxed grains, would the materials properties be isotropic or anisotropic? c. A material is made up of a mixture of large grains and very small grains. Describe what happens when the material is heated at 90% of its' melting point for a long time? You can use 2 pictures or words. A material with a large bond strength generally has a high melting point: True or False? d. Do vacancies generally increase or decrease the resistivity of a metal? e. Arrange these crystal structures in order of APF (smallest to largest): всс, НСР, SC, FCC
- In the production process of copper described by the Pyrometallurgical Smelting Method, __ is used as the main oxidizing agent that removes the sulfur from the copper ore. a. oxygen b. carbon dioxide c. carbon monoxide d. limestone4m K R EMetals H X Se.com/u/1/c/MTUAMTYZNTK2OTM3/a/Mig0NjcAMzk0ODA4/delails tals Homework Packet 18.pdf Oper wth UNDERSTANDING ORES Most ores look like ordinary rocks. You would not guess that they contain shiny metal. The earth's crust is made up of many minerals. Minerals can be defined as naturally occuring chemical elements and compounds. People have discovered more than 2,000 different minerals. Many of these contain metals. But because the metal elements are linked with other elements in the minerals, the metals do not show all of their properties. Figure A 1. Most minerals are elements, compounds 2. In order to free the metal from the other elements, a mineral must be synthesized, decomposed Page 3 I 6 Q +Identify 3 composite materials that uses metallic bonding.
- 5. Which treatment is frequently used to protect aluminium articles from subsequent erosion? A. Making aluminium the anode during electrolysis. B. Dipping the aluminium in hot aqueous sodium hydroxide. C. Dipping the aluminium in molten cryolite. D. Coating the aluminium with a less reactive metal. Which of the following is not a use of silicones? A. Waterproofing. B. Lubricants. C. Computer chips. D. Implants. 7. Which of the following statements, comparing the physical properties of calcium and nickel is correct? (i) The melting point of calcium is lower than that of nickel. (ii) Calcium has a much higher density than nickel. (iii) Calcium does not behave as a catalyst whereas nickel does. A. (i), (ii) and (iii) are correct. B. (ii) and (iii) are correct. C. (iii) is correct. D. (i) and (iii) are correct. 8. Two allotropic forms of sulphur are rhombic and monoclinic. Which of the statements below is not true? A. They both dissolve in nonpolar solvents such as benzene. B. They both…What were the starting materials used in the synthesis of the thermochromic material? a. diethylamine HCl and isopropyl alcohol O b. Copper (II) chloride and absolute ethanol O c. diethylamine HCl and CuCl, O d. isopropyl alcohol and pure ethanol1. The __ process is the method used for producing sulfuric acid in high concentrations that involves the catalytic oxidation of SO2 to SO3 in a equipment called a converter. a. contact b.Nordhausen c.oleum d.exposure