(a)
Interpretation:
The valence band, conduction band, and band gap in the given figure has to be identified.
Concept introduction:
Valence band:
Valence band is defined as valence electron orbital of an element. It is a bunch of orbitals from which electrons shift to conduction band when excitation occurs. Conduction band and valence band are combined together in conductors. In semiconductors, there is a small band gap which separates conduction band and valence band.
Conduction band:
It is a bunch of orbitals into which electrons shift from valence band when excitation occurs. Electrons present in conduction band are free to move which creates
Band gap:
Band gap is the difference in energy between conduction band and valence band. In semiconductors, there is a small band gap which separates conduction band and valence band.
(b)
Interpretation:
The change in electron population when silicon dopes with gallium has to be drawn.
Concept introduction:
Valence band:
Valence band is defined as valence electron orbital of an element. It is a bunch of orbitals from which electrons shift to conduction band when excitation occurs. Conduction band and valence band are combined together in conductors. In semiconductors, there is a small band gap which separates conduction band and valence band.
Conduction band:
It is a bunch of orbitals into which electrons shift from valence band when excitation occurs. Electrons present in conduction band are free to move which creates electric current.
Band gap:
Band gap is the difference in energy between conduction band and valence band. In semiconductors, there is a small band gap which separates conduction band and valence band
(c)
Interpretation:
The change in electron population when silicon dopes with arsenic has to be drawn.
Concept introduction:
Valence band:
Valence band is defined as valence electron orbital of an element. It is a bunch of orbitals from which electrons shift to conduction band when excitation occurs. Conduction band and valence band are combined together in conductors. In semiconductors, there is a small band gap which separates conduction band and valence band.
Conduction band:
It is a bunch of orbitals into which electrons shift from valence band when excitation occurs. Electrons present in conduction band are free to move which creates electric current.
Band gap:
Band gap is the difference in energy between conduction band and valence band. In semiconductors, there is a small band gap which separates conduction band and valence band
(d)
Interpretation:
The electrical conductivity of doped silicon and pure silicon has to be compared. Also the differences has to be explained.
Concept introduction:
Valence band:
Valence band is defined as valence electron orbital of an element. It is a bunch of orbitals from which electrons shift to conduction band when excitation occurs. Conduction band and valence band are combined together in conductors. In semiconductors, there is a small band gap which separates conduction band and valence band.
Conduction band:
It is a bunch of orbitals into which electrons shift from valence band when excitation occurs. Electrons present in conduction band are free to move which creates electric current.
Band gap:
Band gap is the difference in energy between conduction band and valence band. In semiconductors, there is a small band gap which separates conduction band and valence band.
Effect of change in temperature:
Increase in temperature increases electrical conductivity of semiconductors because when temperature raises, there will be more electrons in conduction band and hole in valance band. On the other hand, electrical conductivity decreases when temperature increases due to increased vibrational motion of metal cation around lattice leads to disruption of flow of electrons in crystal.
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Chapter 21 Solutions
General Chemistry: Atoms First
- Predict the product of this organic reaction: IZ + HO i P+H₂O Specifically, in the drawing area below draw the skeletal ("line") structure of P. If there is no reasonable possibility for P, check the No answer box under the drawing area. No Answer Click and drag to start drawing a structure. ☐ :arrow_forwardPredict the products of this organic reaction: 0 O ----- A + KOH ? CH3-CH2-C-O-CH2-C-CH3 Specifically, in the drawing area below draw the condensed structure of the product, or products, of this reaction. (If there's more than one product, draw them in any arrangement you like, so long as they aren't touching.) If there aren't any products because this reaction won't happen, check the No reaction box under the drawing area. No reaction Click anywhere to draw the first atom of your structure. X ⑤ èarrow_forwardPredict the products of this organic reaction: O CH3 + H2O + HCI A A? CH3-CH2-C-N-CH3 Specifically, in the drawing area below draw the condensed structure of the product, or products, of this reaction. If there's more than one product, draw them in any arrangement you like, so long as they aren't touching. If there aren't any products because this reaction won't happen, check the No reaction box under the drawing area. No Reaction Click anywhere to draw the first atom of your structure.arrow_forward
- What is the missing reactant in this organic reaction? R+ HO-C-CH2-CH3 0= CH3 CH3 —CH, C−NH—CH CH3 + H₂O Specifically, in the drawing area below draw the condensed structure of R. If there is more than one reasonable answer, you can draw any one of them. If there is no reasonable answer, check the No answer box under the drawing area. Note for advanced students: you may assume no products other than those shown above are formed. No Answer Click anywhere to draw the first atom of your structure. €arrow_forward个 CHEM&131 9267 - $25 - Intro to Mail - Hutchison, Allison (Student x Aktiv Learnin https://app.aktiv.com Draw the product of the reaction shown below. Ignore inorganic byproducts. + Na2Cr2O7 Acetone, H2SO4 Type here to search Dryng OH W Prarrow_forwardPredict the products of this organic reaction: OH + NaOH A? Specifically, in the drawing area below draw the skeletal ("line") structure of the product, or products, of this reaction. (If there's more than one product, draw them in any arrangement you like, so long as they aren't touching.) If there aren't any products because this reaction won't happen, check the No reaction box under the drawing area. No reaction Click and drag to start drawing a structure. ✓ Sarrow_forward
- Predict the products of this organic reaction: CH3-C-O-CH2-CH2-C-CH3 + H₂O ? A Specifically, in the drawing area below draw the condensed structure of the product, or products, of this reaction. (If there's more than one product, draw them in any arrangement you like, so long as they aren't touching.) If there aren't any products because this reaction won't happen, check the No reaction box under the drawing area. No reaction Click anywhere to draw the first atom of your structure. :☐ darrow_forwardDE d. Draw an arrow pushing mechanism for the following IN O CI N fo 人 P Polle DELL prt sc home end ins F5 F6 F7 F8 F9 F10 F11 F12arrow_forwardPredict the products of this organic reaction: + H₂O H* ? A Specifically, in the drawing area below draw the skeletal ("line") structure of the product, or products, of this reaction. (If there's more than one product, draw them in any arrangement you like, so long as they aren't touching.) If there aren't any products because this reaction won't happen, check the No reaction box under the drawing area. No Reaction Click and drag to start drawing a structure.arrow_forward
- Predict the major organic products of the reaction below and draw them on right side of the arrow. If there will be no significant reaction, check the box below the drawing area instead. C Cl CH, OH There will be no significant reaction. + pyridine G Click and drag to start drawing a structure.arrow_forwardWhat is the missing reactant in this organic reaction? H R+ H2O Δ OH 0= CH3-CH-O-CH3 + CH3-C-OH Specifically, in the drawing area below draw the condensed structure of R. If there is more than one reasonable answer, you can draw any one of them. If there is no reasonable answer, check the No answer box under the drawing area. No Answer Click anywhere to draw the first atom of your structure. dyarrow_forwardYou are trying to determine whether the following organic reaction can be done in a single synthesis step. If so, add any missing reagents or conditions in the drawing area below. If it isn't possible to do this reaction in a single synthesis step, check the box below the drawing area instead. Note for advanced students: if you have a choice of reagents to add, you should choose the least reactive and most economical reagents possible. Cl It isn't possible to do this reaction in a single synthesis step. + T OHarrow_forward
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