Interpretation:
The reason as to why zone refining, used to make ultra-pure silicon, would not be a practical method of making ultra-pure carbon is to be stated.
Concept introduction:
Zone refining is a method that is used to form pure solid crystals of different substances. Zone-refining is based on the principle that impurities are more soluble in the molten state than in the solid state. The impure substance is placed on a heating belt which is moving continuously, a temperature gradient is maintained on the belt. The substance is melted on one side of the belt and gets cooled to solidify on the other side of the belt. The impurities remain in the molten state and a pure solid substance is obtained.
Want to see the full answer?
Check out a sample textbook solutionChapter 7 Solutions
Student Solutions Manual for Ball's Physical Chemistry, 2nd
- Please correct answer and don't used hand raitingarrow_forwardCalculate the packing factor of CaTiO3. It has a perovskite structure. Data: ionic radii Co²+ = 0.106 nm, Ti4+ = 0.064 nm, O² = 0.132 nm; lattice constant is a = 2(rTi4+ + ro2-). Ca2+ 02- T14+ Consider the ions as rigid spheres. 1. 0.581 or 58.1% 2. -0.581 or -58.1 % 3. 0.254 or 25.4%arrow_forwardGeneral formula etherarrow_forward
- Please provide the retrosynthetic analysis and forward synthesis of the molecule on the left from the starting material on the right. Please include hand-drawn structures! will upvote! Please correct answer and don't used hand raitingarrow_forwardPlease provide the retrosynthetic analysis and forward synthesis of the molecule on the left from the starting material on the right. Please include hand-drawn structures! will upvote!arrow_forward(please correct answer and don't used hand raiting) Please provide the retrosynthetic analysis and forward synthesis of the molecule on the left from the starting material on the right. Please include hand-drawn structures! will upvote!arrow_forward
- CaTiO3 has a perovskite structure. Calculate the packing factor.Data: ionic radii Co+2 = 0.106 nm, Ti+4 = 0.064 nm, O-2 = 0.132 nm; lattice constant is a = 2(rTi4+ + rO-2).(a) 0.581(b) -0.581(c) 0.254(d) -0.254arrow_forwardIn the initial linear section of the stress-strain curve of a metal or alloy. Explain from the point of view of atomic structure?(a) No, the atomic level properties of the material can never be related to the linear section.(b) The elastic zone is influenced by the strength of the bonds between atoms.(c) The stronger the bond, the less rigid and the lower the Young's Modulus of the material tested.(d) The stronger the bond, the less stress is necessary to apply to the material to deform it elastically.arrow_forwardThe degree of polymerization of polytetrafluoroethylene (Teflon) is 7500 (mers/mol). If all polymer chains have equal length, state the molecular weight of the polymer and the total number of chains in 1000 g of the polymer(a) 50 000 g/mol; 0.03·1020 chains(b) 100 000 g/mol; 1.03·1020 chains(c) 750 000 g/mol; 8.03·1020 chainsarrow_forward
- In natural rubber or polyisoprene, the trans isomer leads to a higher degree of crystallinity and density than the cis isomer of the same polymer, because(a) it is more symmetrical and regular.(b) it is less symmetrical.(c) it is irregular.arrow_forwardMost ceramic materials have low thermal conductivities because:(a) Electron mobility is strongly restricted due to their strong ionic-covalent bonding.(b) False, in general they are excellent thermal conductors (they are used in ovens).(c) Electron mobility is dependent on T and therefore they are poor conductors at high temperatures.(d) Electron mobility is very restricted by secondary bonds.arrow_forwardResistivity and electrical conductivity.(a) In metals, resistivity decreases.(b) In metals, resistivity decreases and conductivity in semiconductors also decreases with increasing temperature.(c) With increasing temperature, resistivity in metals and conductivity in semiconductors also increases.(d) None of the above.arrow_forward
- Physical ChemistryChemistryISBN:9781133958437Author:Ball, David W. (david Warren), BAER, TomasPublisher:Wadsworth Cengage Learning,Chemistry: Matter and ChangeChemistryISBN:9780078746376Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl WistromPublisher:Glencoe/McGraw-Hill School Pub CoChemistry: The Molecular ScienceChemistryISBN:9781285199047Author:John W. Moore, Conrad L. StanitskiPublisher:Cengage Learning
- Chemistry & Chemical ReactivityChemistryISBN:9781337399074Author:John C. Kotz, Paul M. Treichel, John Townsend, David TreichelPublisher:Cengage LearningChemistry for Engineering StudentsChemistryISBN:9781285199023Author:Lawrence S. Brown, Tom HolmePublisher:Cengage LearningChemistry & Chemical ReactivityChemistryISBN:9781133949640Author:John C. Kotz, Paul M. Treichel, John Townsend, David TreichelPublisher:Cengage Learning