1. A 50wt% Pb-50wt% Mg alloy is slowly cooled from 700°C to 400°C. (a) At what temperature does the first solid phase form? (b) What is the composition of this solid phase? (c) At what temperature does the liquid solidify completely? (d)What is the composition of this last remaining liquid phase? Temperature (°C) 700 600 500 400 300 200 100 D 20 40 Composition (at Pb) 10 60 Composition (wt% Pb) 40 70 100 1200 1000 900 Mg-Pb 600 400 200 Mg Pb 100 (Pb) Temperature F

1. A 50wt% Pb-50wt% Mg alloy is slowly cooled from 700°C to 400°C. (a) At what temperature does the first solid phase form? (b) What is the composition of this solid phase? (c) At what temperature does the liquid solidify completely? (d)What is the composition of this last remaining liquid phase? Temperature (°C) 700 600 500 400 300 200 100 D 20 40 Composition (at Pb) 10 60 Composition (wt% Pb) 40 70 100 1200 1000 900 Mg-Pb 600 400 200 Mg Pb 100 (Pb) Temperature F

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter9: Liquids, Solids, And Materials

Section: Chapter Questions

Problem 92QRT

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Sulfur exhibits two solid phases, rhombic and monoclinic. Use the accompanying phase diagram for sulfur given below to answer the questions that follow. (A). How many triple points are in the phase diagram? (B). What phases are in equilibrium at the topmost triple point? (C). How many phase transitions are there when rhombic sulfur at 1 atm and 80°C is heated to 500°C at constant pressure?
Refer to the phase diagram below. A copper-nickel alloy of composition 70 wt% Ni-30 wt% Cu is slowly heated from a temperature of 1300°C. (a) At what temperature does the first liquid phase form? (b) What is the composition of this liquid phase? (c) At what temperature does complete melting of the alloy occur? (d) What is the composition of the last solid remaining prior to complete melting?
The thermal and mechanical processing of materials is an important step in ensuring that they have the appropriate physical properties for their intended application. Suppose a metallic element undergoes a phase transit ion in which its crystal structure changes from cubic close-packed to bodycentredcubic. (a) Does it become more or less dense? (b) By what factor does its density change?
Use the following atomic masses (in g/mol):Mg = 24.31; O = 16; Ca = 40.08; C = 12.01; Na = 23; H = 1; N = 14.01; S = 32.06; Cl = 35.45; 2.) Limestone consists chiefly of mineral calcite (CaCO3). The carbonate content of 0.5413g of powdered limestone was measured by suspending the powder in water, adding 10mL of 1.392M HCl and heating to dissolve the solid and expel CO2. The excess acid required 39.96mL of 0.1004M NaOH for complete titration to a phenolphthalein end point. Find the % wt of calcite in limestone.
Scence Midterm Summ X Material%20Science_Midterm%2 x ewer?url=https://ttu-storage.s3.eu-central-1.amazonaws.com/account 1/attachments/390676/Ma ence Midte 02021.pdf Open with Google Docs 5. Iron has a BCC crystal structure, an atomic radius of 0.124 nm, and an atomic weight of 55.85 g/mol. Compute its theoretical density: 6. Below is a unit cell for a hypothetical metal. (a) To which crystal system does this unit cell belong? 40nm 030 nm 0.30 nm (b) What would this crystal structure be called? 1 1 2 7. Sketch a tetragonal unit cell. and witnin that Page Hocations of the point: DELL
B6
planar density
2. Which one of the following statements is incorrect? (a) According to the Gibbs phase rule, four phases of a pure substance cannot exist (b) All triple points correspond to a gas-liquid-solid equilibrium (c) The triple point in a P-T diagram becomes a triple line in a P-V diagram (d) The chemical potential determines which of several phases is the most stable
10-44 Determine the liquidus temperature, soli- dus temperature, and freezing range for the following NiO-MgO ceramic compositions: (a) NiO-30 mol% MgO; (b) NiO-45 mol% MgO; (c) NiO-60 mol% MgO; and (d) NiO-85 mol% MgO. [See Figure 10-8(b).] 2800 2600 2400 L+S 2200 (Ni, Mg)O 2000, 'NiO 20 40 60 80 MgO Mole percent Mg0 (b) Figure 10-8(b) The equilibrium phase diagram for the NiO-MgO system. (Repeated for Problems 10-44, 10-50, 10-53, 10-57, and 10-71.) Temperature (°C)
The vapor pressures of solid Cl2 are 352 Pa at -112°C and 35 Pa at -126.5'C. The vapor pressure of liquid Cl2 are 1590 Pa at-100°C and 7830 Pa at -80°C. Calculate (i) A sub H, (ii) Avap H, (iii) A fus H, and (iv) the triple point temperature (T3). Select one or more: A. (i) 87.5 kJ/mol, (ii) 78.9 kJ/mol, (iii) 9.0 kJ/mol, (iv) -36.7°C B. (i) 21.3 kJ/mol, (ii) 13.9 kJ/mol, (iii) 45.4 kJ/mol, (iv) 45°C C. (i) 31.4 kJ/mol, (ii) 13.9 kJ/mol, (iii) 17.5 kJ/mol, (iv) -88°C * D. (i) 31.4 kJ/mol, (ii) 23.9 kJ/mol, (iii) 7.5 kJ/mol, (i) -88°C Your answer is incorrect.
help
A sample of mineral containing water as the onlyvolatile constituent contains 26.40% SiO2 and8.86% H2O. What is the corrected percentage of SiO2(%SiO2) in the material after sufficient heating to drive off allof the water?

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