Use the Pb-Sn diagram below to answer the following questions. 350 327°C Liquid, L 300 250 232°C Pb-rich 200 solid (Pb) Sn-rich solid (Sn) 183°C 18.3% 61.9% 97.8% 150 100 50 Two phase: (Sn) + (Pb) 10 20 30 40 50 60 70 80 90 100 Pb Sn wt.% Sn (a) What are the values of the state variables (composition and temperature) at constitution point 1? (b) Mark the constitution points for Pb-60wt% Sn and Pb-20wt% Sn alloys at 2500C. What phases are present in each case? (c) The alloy at constitution point 1 is cooled very slowly to room temperature, maintaining equilibrium. At which temperatures do changes in the number or type of phases occur? What phases are present at constitution points 2 and 3? Temperature, T (°C)
Use the Pb-Sn diagram below to answer the following questions. 350 327°C Liquid, L 300 250 232°C Pb-rich 200 solid (Pb) Sn-rich solid (Sn) 183°C 18.3% 61.9% 97.8% 150 100 50 Two phase: (Sn) + (Pb) 10 20 30 40 50 60 70 80 90 100 Pb Sn wt.% Sn (a) What are the values of the state variables (composition and temperature) at constitution point 1? (b) Mark the constitution points for Pb-60wt% Sn and Pb-20wt% Sn alloys at 2500C. What phases are present in each case? (c) The alloy at constitution point 1 is cooled very slowly to room temperature, maintaining equilibrium. At which temperatures do changes in the number or type of phases occur? What phases are present at constitution points 2 and 3? Temperature, T (°C)
Chemistry
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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...
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Transcribed Image Text:QUESTION 1
Use the Pb-Sn diagram below to answer the following questions.
350
327°C
Liquid, L
300
250
232°C
Pb-rich
Sn-rich
solid (Sn)
200
solid (Pb)
183°C
18.3%
61.9%
97.8%
150
100
50
Two phase: (Sn) + (Pb)
10
20
30
40
50
60
70
80
90
100
Pb
Sn
wt.% Sn
(a) What are the values of the state variables (composition and temperature) at constitution point 1?
(b) Mark the constitution points for Pb-60wt% Sn and Pb-20wt% Sn alloys at 2500C. What phases are
present in each case?
(c) The alloy at constitution point 1 is cooled very slowly to Poom temperature, maintaining eqilibrium.
At which temperatures do changes in the number or type of phases occur? What phases are present at
constitution points 2 and 3?
(d) The alloy at constitution point 4 is cooled slowly to room temperature. Identify the following:
(i) the initial composition, temperature and phase(s);
(ii) the temperature at which a phase change occurs, and the final phase(s).
Temperature, T (°C)
3,
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