Question

Q7 (15 pts): Consider the following phase diagram of carbon: 106 SOLID (diamond) 105 LIQUID 104 Prosaure Pressure (bar) 103 SOUD (graphite) 102 GAS 10 2000 4000 6000 Temperature (0) a. [10 pts). Describe the phases, changes, names and types of the process(es) a carbon sample might undergo as it changes from point "b" to point "d". b. [5 pts). Under what conditions a carbon sample at point "b" can be changed into diamond?

Answer 1

given in Please diagram : solid lokamond) You ./. solid d. (Liquid) graphite) b(Gas)in in de Pressurl 03 (bar) You 10 7. 6ovo, ot. Qovo 4000 (Temp: -1 a . go a less than Joo bar it, is graphical representation of physical states of substance under different pressure and Tenip: Two states of Substance Coexist a Equilibrium linea. The point where all 3 stale (solid, liquid, : exist is known as tople point. Phases :- is at temperature ( 4000 k. p solid state w if Temperature > 4.500k and pressure → gas estate (w if Temperature > 45ook and pressure around tlooo oooo) bar then it is liquid phase. Change å ů in het a Temperature > 45ook, if pressure increase from: To bar to looo bar their gas. Convert into Convert into liquid - condensation (wit. Temperature > 4500 k and pressure further increase more Than 105 bar liquid convert to asolid → Range then > freezing

ai it Tempaattoos and pressure < 10obar and - Temperature reduces from Googk to 4000 k Thea gas Convent to asolid Deposition Regeeres despa روکه changes from point bi to point. & point b at los bar where as point d at 10000 bar first at constant. Temperature (soook). by increasing pressure from 100 to loved bases Conversion occurs from gas to liquid, '/ Then at pressure lowook, decrease the Temperature around 4500 kg phase change from liquid to e asolid a (graphite). Cinn," ) ) ) Phase change Dicgrum. Melting solid Liquid freezing D, n! -1) sublimise Depositions gous Vapowrise Conden setion asublimation : at lobar, increase Temperature from. 4000 to 6ooo ke Vapouri sanion : at 6ooo k Temperature, reduce pressure by from 10000 bar to 1oooo bar to 10 bar Melting: at 10000 an increase Temperature from 4000 to 6000 k.

62 Condition for Carbon at point bh to Convert into Diamond =) point "b" positioned at loo bar and soook, aso we have to reduce Temperature first, ܫܵܝܬܚܟܩܣܣܐ ܫܡܝܙܠܣ>2 ܝܩܘܩ ܤܓ ܢܦܝܩܩܫܘܟܚܐܒ فيتام كف ما لهمة reduced from 5000 K To Sooo k Te'. 3000 K. gemeente isolid (graphite) by Deposition plenamenor. after that at Constant Temperature of 3000K increase the pressure from loo bar to |రాణం ban, tot The solid Convert Te solid (diamonds (graphite)

Just notice the temperature and pressure variations.