4. Discuss: a.) Delta fH• becomes less negative along the series LiF, NaF, KF, R
ID: 900742 • Letter: 4
Question
4. Discuss:a.) Delta fH• becomes less negative along the series LiF, NaF, KF, RbF and CsF, but more negative along the series Lil, NaI, KI, RbI and CsI.
b.) Raising the temperature of a sample of alpha- Fe from 298K to 1200K(at one bar pressure) results in a change of coordination number of each Fe atom from 8-12.
c.) Although a non-metal, graphite is often used as an electrode material.
d.) The semiconducting properties of silicon are improved by adding minute amounts of boron.
e.) The Cr and Ni content of stainless steel a used to make knife blades is different from that used in the manufacturing process. 7. There has been a "recent" flurry of interest in the possibility of cold fusion of hydrogen atoms in metallic palladium. The original idea came from the enormous solubility of hydrogen gas in palladium. Palladium metal has an fcc lattice. Hydrogen atoms occupy the octahedral holes. If 70% of the octahedral holes are filled by nitrogen atoms and the lattice doesn't explains upon hydrogenation. How many grams of hydrogen will be contained in one cubicv meter of palladium hydride? Compare this to the density of liquid hydrogen in grams/-3. Comment.
4. Discuss:
a.) Delta fH• becomes less negative along the series LiF, NaF, KF, RbF and CsF, but more negative along the series Lil, NaI, KI, RbI and CsI.
b.) Raising the temperature of a sample of alpha- Fe from 298K to 1200K(at one bar pressure) results in a change of coordination number of each Fe atom from 8-12.
c.) Although a non-metal, graphite is often used as an electrode material.
d.) The semiconducting properties of silicon are improved by adding minute amounts of boron.
e.) The Cr and Ni content of stainless steel a used to make knife blades is different from that used in the manufacturing process. 7. There has been a "recent" flurry of interest in the possibility of cold fusion of hydrogen atoms in metallic palladium. The original idea came from the enormous solubility of hydrogen gas in palladium. Palladium metal has an fcc lattice. Hydrogen atoms occupy the octahedral holes. If 70% of the octahedral holes are filled by nitrogen atoms and the lattice doesn't explains upon hydrogenation. How many grams of hydrogen will be contained in one cubicv meter of palladium hydride? Compare this to the density of liquid hydrogen in grams/-3. Comment.
4. Discuss:
a.) Delta fH• becomes less negative along the series LiF, NaF, KF, RbF and CsF, but more negative along the series Lil, NaI, KI, RbI and CsI.
b.) Raising the temperature of a sample of alpha- Fe from 298K to 1200K(at one bar pressure) results in a change of coordination number of each Fe atom from 8-12.
c.) Although a non-metal, graphite is often used as an electrode material.
d.) The semiconducting properties of silicon are improved by adding minute amounts of boron.
e.) The Cr and Ni content of stainless steel a used to make knife blades is different from that used in the manufacturing process. 7. There has been a "recent" flurry of interest in the possibility of cold fusion of hydrogen atoms in metallic palladium. The original idea came from the enormous solubility of hydrogen gas in palladium. Palladium metal has an fcc lattice. Hydrogen atoms occupy the octahedral holes. If 70% of the octahedral holes are filled by nitrogen atoms and the lattice doesn't explains upon hydrogenation. How many grams of hydrogen will be contained in one cubicv meter of palladium hydride? Compare this to the density of liquid hydrogen in grams/-3. Comment.
4. Discuss:
a.) Delta fH• becomes less negative along the series LiF, NaF, KF, RbF and CsF, but more negative along the series Lil, NaI, KI, RbI and CsI.
b.) Raising the temperature of a sample of alpha- Fe from 298K to 1200K(at one bar pressure) results in a change of coordination number of each Fe atom from 8-12.
c.) Although a non-metal, graphite is often used as an electrode material.
d.) The semiconducting properties of silicon are improved by adding minute amounts of boron.
e.) The Cr and Ni content of stainless steel a used to make knife blades is different from that used in the manufacturing process. 7. There has been a "recent" flurry of interest in the possibility of cold fusion of hydrogen atoms in metallic palladium. The original idea came from the enormous solubility of hydrogen gas in palladium. Palladium metal has an fcc lattice. Hydrogen atoms occupy the octahedral holes. If 70% of the octahedral holes are filled by nitrogen atoms and the lattice doesn't explains upon hydrogenation. How many grams of hydrogen will be contained in one cubicv meter of palladium hydride? Compare this to the density of liquid hydrogen in grams/-3. Comment.
4. Discuss:
a.) Delta fH• becomes less negative along the series LiF, NaF, KF, RbF and CsF, but more negative along the series Lil, NaI, KI, RbI and CsI.
b.) Raising the temperature of a sample of alpha- Fe from 298K to 1200K(at one bar pressure) results in a change of coordination number of each Fe atom from 8-12.
c.) Although a non-metal, graphite is often used as an electrode material.
d.) The semiconducting properties of silicon are improved by adding minute amounts of boron.
e.) The Cr and Ni content of stainless steel a used to make knife blades is different from that used in the manufacturing process. 7. There has been a "recent" flurry of interest in the possibility of cold fusion of hydrogen atoms in metallic palladium. The original idea came from the enormous solubility of hydrogen gas in palladium. Palladium metal has an fcc lattice. Hydrogen atoms occupy the octahedral holes. If 70% of the octahedral holes are filled by nitrogen atoms and the lattice doesn't explains upon hydrogenation. How many grams of hydrogen will be contained in one cubicv meter of palladium hydride? Compare this to the density of liquid hydrogen in grams/-3. Comment.
4. Discuss:
a.) Delta fH• becomes less negative along the series LiF, NaF, KF, RbF and CsF, but more negative along the series Lil, NaI, KI, RbI and CsI.
b.) Raising the temperature of a sample of alpha- Fe from 298K to 1200K(at one bar pressure) results in a change of coordination number of each Fe atom from 8-12.
c.) Although a non-metal, graphite is often used as an electrode material.
d.) The semiconducting properties of silicon are improved by adding minute amounts of boron.
e.) The Cr and Ni content of stainless steel a used to make knife blades is different from that used in the manufacturing process. 7. There has been a "recent" flurry of interest in the possibility of cold fusion of hydrogen atoms in metallic palladium. The original idea came from the enormous solubility of hydrogen gas in palladium. Palladium metal has an fcc lattice. Hydrogen atoms occupy the octahedral holes. If 70% of the octahedral holes are filled by nitrogen atoms and the lattice doesn't explains upon hydrogenation. How many grams of hydrogen will be contained in one cubicv meter of palladium hydride? Compare this to the density of liquid hydrogen in grams/-3. Comment.
Explanation / Answer
a) dHf becomes less negative along the series LiF, NaF, KF, RbF and CsF because as we move down the group the size alkali metal increases and hence the interaction between cation and anion becomes less effective and hence less strong bond formation takes place consequently less negative energy (i.e less amount of energy is released)
b) This is because different crystal structure exist at different temperatures and also stable at different temperature range values.
c) Graphite, is a good conductor of electricity, but it is a nonmetal although comparable to metals. However, if metals had been used for making electrodes, it might have corroded, or would have dissolved in acids or bases. This would reduce the efficiency of the cell. Graphite, on the other hand, does not have these problems. It does not dissolve in acids or bases or even water and is a non-corrosive material. Moreover, graphite is cheaper than metals. This also adds to reduce the cost of production of the cells.
d) When we add small amount of impurities to a semiconductor then an extrinsic semiconductor is formed which is an improved intrinsic semiconductor and the process is known as doping, which alters the electrical properties of the semiconductor and improves its conductivity. Introducing impurities into the semiconductor materials also can control their conductivity. The addition of trivalent impurities such as boron, aluminum or gallium to an intrinsic semiconductor creates deficiencies of valence electrons,called "holes" and improves electrical conductivity. It is typical to use B2H6 diborane gas.
e)
Related Questions
Hire Me For All Your Tutoring Needs
Integrity-first tutoring: clear explanations, guidance, and feedback.
Drop an Email at
drjack9650@gmail.com
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.