
Interpretation:
Change in electrical resistance with increase in temperature differs in semiconductor and metallic conductor has to be explained.
Concept Introduction:
Semiconductors are the substances that have electrical conductivity between conductors and insulators such as materials of silicon and germanium.
Valence band contains valence electrons of atom and these electrons jumps to conduction band when excited. Conduction band is the band of high energy and generally has no free electrons and is empty. Electrons get excited to this band and move freely and conduct electricity.
Metallic conductors are those that cause

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Chapter 3 Solutions
Chemical Principles: The Quest for Insight
- Can I please get help with this?arrow_forward.. Give the major organic product(s) for each of the following reactions or sequences of reactions. Show ll relevant stereochemistry [3 ONLY]. A H Br 1. NaCN 2 NaOH, H₂O, heat 3. H3O+ B. CH₂COOH 19000 1. LiAlH4 THF, heat 2 H₂O* C. CH Br 1. NaCN, acetone 2 H3O+, heat D. Br 1. Mg. ether 3. H₂O+ 2 CO₂ E. CN 1. (CH) CHMgBr, ether 2 H₂O+arrow_forwardAssign this COSY spectrumarrow_forward
- Can I please get help with this?arrow_forward1. Draw structures corresponding to each of the following names [3 ONLY]: A. 2,2,2-trichloroethanal (chloral). B. trans-3-isopropylcyclohexanecarbaldehyde C. What is the correct structure for 2-hydroxyacetophenone? Circle the letter of your response. a C 0 OH OH OH HO b. H3C CH 0 H d OH D. Provide IUPAC names for each structure below. 0 H C-H 0 0 CH3 H NO₂ E. The substance formed on addition of water to an aldehyde or ketone is called a hydrate or a/an: a. vicinal diol b. geminal diol C. acetal d. ketalarrow_forwardAssign this spectrumarrow_forward
- Redraw the tripeptide with or without its acidic hydrogensto demonstrate where the total charge of -2 comes from: *see imagearrow_forward2. Consider the data below to answer the following questions. Cyanohydrins are important intermediates in the synthesis of α-hydroxycarboxylic acids from ketones and aldehydes. The nitrile functional group can be hydrolyzed by aqueous acid to yield a carboxylic acid. Nitriles can also be hydrolyzed to carboxylic acids using aqueous base. Unfortunately, when a cyanohydrin is treated with aqueous base the original carbonyl compound is isolated. OH CH-COOH 0 HO CN C H30* C. H H HC N NaOH H₂O C=O 0 cyanohydrin H + NaCN + H₂Oarrow_forwardAssign all integrated peaksarrow_forward
- - Consider the data in the Table below to answer the following questions: Acidities of Substituted Benzoic and Acetic Acids pk,s at 25C Y-CH COOH Y Y - CH₂COOH meta para H 4.75 4.19 4.19 2.47 3.64 3.55 3.57 4.09 4.46 CN OCH 3 A. Draw the structure of the strongest acid in the table above. B. Explain why cyanoacetic acid and methoxyacetic acid are more acidic than their correspondingly substituted benzoic acid counterparts.arrow_forwardDraw the curved arrow mechanism for this reaction starting with 2-propanol in sulfuric acid. Show all nonzero formal charges and all nonbonded electrons in each step. Species not involved in a particular step do not need to be included in that step, and resonance forms do not need to be shown. Note that the alcohol is in much higher concentration than H₂O in this reaction. Harrow_forwardProvide reactions showing the following conversions: * see imagearrow_forward
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