Make schematic sketches of the microstructures that would be observed for conditions of very slow cooling for a 50 wt% Pb -50 wt% Mg at (a) 500°C and (b) 300°C. Label all phases and indicate their approximate compositions. Composition (at% Pb) 10 20 30 40 70 100 700 L 1200 600 + a +L M82PB M 1000 500 800 400 L + Mg2Pb 600 300 400 200 a + M&2PB Mg Pb 200 100 Mg Pb 81% 16.920 34.7 40 60 61.5 80 100 (Mg) Composition (wt% Pb) (Pb) Temperature (°C) 하 Temperature (°F)

Make schematic sketches of the microstructures that would be observed for conditions of very slow cooling for a 50 wt% Pb -50 wt% Mg at (a) 500°C and (b) 300°C. Label all phases and indicate their approximate compositions. Composition (at% Pb) 10 20 30 40 70 100 700 L 1200 600 + a +L M82PB M 1000 500 800 400 L + Mg2Pb 600 300 400 200 a + M&2PB Mg Pb 200 100 Mg Pb 81% 16.920 34.7 40 60 61.5 80 100 (Mg) Composition (wt% Pb) (Pb) Temperature (°C) 하 Temperature (°F)

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

See similar textbooks

Similar questions

A binary mixture with components A and B is to be separated in a distillation column to obtain 95 mol%. A as the top product. The binary mixture has a con stant relative volatility AB = 2. The column feed is a a - saturated liquid containing 50 mol % of A. Under the usual simplifying assumptions such as constant molal overflow, negligible heat loss, ideal trays, the mini mum reflux ratio for this separation is (rounded off to one decimal place)
For a 35 wt% Sn - 65 wt% Pb composition, draw the schematic of microstructural at the points (solid red circle) in the following diagram when cooled development from 320°C. T(°C) 300 200 TE 100 O α L+a Pb-Sn system L 183°C a + ß I 1 20 35 40 1 60 L+B 80 100 C, wt% Sn
(1) Fill in the table with the missing properties for H20 T (°C) P (kPa) v (m'/kg) 0.001080 State description Saturated liquid 90 0.86 175 Saturated vapor 300 0.15 110 2000 9000 700 515 0.18 310 150 0.001043 35 25.205
1. ) A Txy diagram is shown below for a two-component system (A and B) at P = 1 atm. Use the diagram to answer the following questions. Temperature (°C) d) e) 110 100 90 80 70 60 50 0 0.2 0.4 0.6 0.8 Mole fraction A 1.0 a) ) What are the dew point temperature and the bubble point temperature for a mixture containing 0.8 mol A/mol and the balance of B? b) What is the composition of the vapor phase for the same mixture if heated to 90°C? Specify units. c) temperature of B? > Which component is more volatile, (A or B)? Explain briefly. How would the boiling point temperatures of A and B change if the pressure was increased to 5 atm? Explain briefly. ) What is the normal boiling point
5. hařreloWith reference to the liquid-solid phase diagram below, label the four regions of the diagram appropriately. Consider that we have a mixture of composition xâ = 0.65 at T = 400°C. Describe (narrate) what is happening as we cool the melt down to the eutectic temperature (150°C). Describe the phases (liquid phase and solid B phase: remember the lever rule) and their respective relative molar amounts when this mixture is cooled to 200°C. (Refer to the Liquid-Solid [L-S] Phase Diagram; note that scoring for this item would be based on certain terms or phrases that are expected in describing a L-S profile).
Solid-liquid phase diagram of naphthalene-biphenyl system was formed by determination of arrest and break points in cooling curves of different composition mixtures as follows 82 283 2222 90 80 Temperature (°C) 111 70 1 50 40 30 20 10 0 Area Area 1 0.2 Phase Diagram Area Il Area IV Area III 0.8 0.4 0.6 Mole fraction of naphthalene 1 a. Write the phases of naphthalene and biphenyl in different areas on graph (assume that these molecules are completely miscible in liquid phase and immiscible in solid phase) of phases Explanations (Which phases present?) 12 b. Explain briefly the eutectic point and explain its position on graph
These are characteristics of solvent used for recrystallization except: should react with the substance to be dissolved should dissolve an appreciable amount of the substance to be purified when hot and should crystallize most of the substance when cold should be capable of easy removal from the filtered crystals and therefore its boiling point should be preferably w/in 60 - 100 OC could yield well formed crystals of the desired substance
3.4. At 0°C, enthalpy of fusion of ice water is 1434,6 cal/mol. Volume of water in solid an liquid form are 1,098 and 1,001 ml/g, respectively. Determine the dP/dT for the melting proces and the melting temperature of ice water at 4 atm. Answer: Tfusion (4atm) = -0,0243 °C
2. A liquid at 1000°C and an overall composition of 55% zinc (45% copper) is cooled to 600 C. a. What phases are present? b. What are the compositions of each phase? What are the mass fractions of each phase? с.
The following table gives the vapor pressures of liquid chloroform(1) + acetone(2) solutions at 35 °C. 0.200 0.600 Pi/kPa p2/ kPa 4.5 19.7 39.1 45.9 36.0 13.6 a) Calculate the Raoult's law activity coefficient nRL of chloroform at composition xI =0.200. b) Calculate the Raoult's law activity coefficient pRL of acetone at composition xi =0.600. c) nkL and 2KL are both < 1. Why? Give a molecular explanation. Hint: chloroform and acetone molecules hydrogen-bond in liquid solutions
Given the phase diagram below, which of the following statements are TRUE: Temperature (°C) 1600 1500 1400 1300 1200 1100 1000 1085 °C 0 (Cu) 20 B) Point "A" is a homogeneous system At 1100 C, pure Cu exists in liquid phase Composition (at% Ni) 20 40 60 80 Liquid Liquidus line B. A At 1453 C, pure Cu exists in both liquid and solid phases CL 40 60 Composition (wt% Ni) Solidus line Cu and Ni have complete solubility in both liquid and solid phases E Both liquid and solid phases for Cu and Ni exist at point "B" 1453 °C 100 80 2800 2600 2400 2200 2000 100 (Ni) Temperature (°F)