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Video: Puas yog xuab zeb yog lub network covalent khoom?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Covalent Network Solid
Covalent network solids muaj xws li cov pob zeb diamond, silicon, qee yam nonmetals, thiab qee qhov covalent cov khoom sib xyaw xws li silicon dioxide ( xuab zeb ) thiab silicon carbide (carborundum, abrasive ntawm sandpaper). Piv txwv li, pob zeb diamond yog ib qho nyuaj tshaj plaws uas paub thiab melts saum 3500 ° C
Raws li kev sib raug zoo, steel puas yog lub network covalent khoom?
Covalent solids yog tsim los ntawm tes hauj lwm los yog chainsof atoms los yog molecules tuav ua ke los ntawm covalent daim ntawv cog lus. Aperfect ib crystal ntawm a covalent khoom yog li ntawd asingle giant molecule. (a) Pob zeb diamond muaj sp3 hybridizedcarbon atoms, txhua qhov sib txuas rau plaub lwm carbon atoms.
Ib tug kuj yuav nug, dab tsi yog piv txwv ntawm lub network covalent khoom? Network Covalent Khoom . Piv txwv ntawm network covalent solids muaj xws li pob zeb diamond thiab graphite (bothallotropes ntawm carbon), thiab cov tshuaj sib xyaw silicon carbide thiab boron-carbide.
Ib yam li ntawd, puas yog graphite lub network covalent khoom?
Covalent - network (tseem hu ua atomic) cov khoom khib nyiab - Ua los ntawm atoms txuas nrog covalent daim ntawv cog lus; lub zog intermolecular yog covalent bonds as well. Characterized li nyuaj heev nrog cov ntsiab lus melting siab heev thiab ua cov neeg ua haujlwm tsis zoo. Piv txwv ntawm hom no khov kho pob zeb diamond thiab graphite , thiab cov fullerenes.
Dab tsi ua rau covalent network ruaj khov?
A network ruaj khov los yog covalent network solid yog ib qho tshuaj sib xyaw ua ke (lossis cov khoom) uas cov atoms tau sib koom ua ke covalent bonds nyob rau hauv ib tug nruam network extending thoob plaws hauv cov khoom. Hauv ib network ruaj khov muaj noindividual molecules, thiab tag nrho cov siv lead ua los yog amorphous khov kho tej zaum yuav suav hais tias yog macromolecule.
Pom zoo:
Puas yog xuab zeb thiab dej homogeneous lossis heterogeneous?
Teb chaws As Mes Lis Kas: yog xuab zeb thiab dej yog homogeneous sib tov? Yog nws yog. Kev sib xyaw heterogeneous txhais tau tias koj tuaj yeem pom cov khoom ntawm tus kheej thiab cais lawv lub cev. Koj tuaj yeem pom cov xuab zeb hauv dej txawm tias koj swirl lawv ua ke
Lub npe ntawm lub network loj hauv lub cev yog dab tsi uas tswj cov noob qhia?
NARRATOR: Cov cim npe no thiab lwm tus tswj cov noob qhia los ntawm lub network loj hauv lub cev hu ua epigenome. RANDY JIRTLE: Epigenetics txhais tau tias tsuas yog lub ntsiab lus saum genome
Puas yog silicon carbide yog covalent network?
Piv txwv ntawm cov khoom siv network covalent muaj xws li pob zeb diamond thiab graphite (ob qho tib si allotropes ntawm carbon), thiab cov tshuaj sib xyaw ua ke silicon carbide thiab boron-carbide. Lub hardness thiab siab melting thiab boiling cov ntsiab lus ntawm network covalent solids stems los ntawm qhov tseeb hais tias covalent bonds tuav lawv ua ke tsis yooj yim tawg
Lub npe rau lub pob zeb nruab nrab ntawm cov pob zeb uas txias heev yog dab tsi?
Extrusive igneous pob zeb
Cov xuab zeb thiab dej puas tuaj yeem sib cais pom?
Kev piav qhia: Kev lim dej ua haujlwm zoo tshaj plaws yog tias cov ntsiab lus tsis yaj hauv cov kuab tshuaj. Piv txwv li, xuab zeb thiab dej tuaj yeem sib cais los ntawm kev pom vim tias ob qho tib si tsis yaj nrog ib leeg. Txawm li cas los xij, cov suab thaj thiab dej yuav tsis raug cais los ntawm kev pom thaum lawv yaj nrog ib leeg