Vim li cas lub melting point ntawm pob zeb diamond siab dua graphite?
Vim li cas lub melting point ntawm pob zeb diamond siab dua graphite?

Video: Vim li cas lub melting point ntawm pob zeb diamond siab dua graphite?

Video: Vim li cas lub melting point ntawm pob zeb diamond siab dua graphite?
Video: Luxurious Holiday at a Traditional Japanese Inn! Recharge in the Nature and Warm Hospitality 2024, Kaum ib hlis
Anonim

Hauv pob zeb diamond valence electrons yog tag nrho covalently bonded. Tab sis nyob rau hauv graphite Tsuas yog peb qhov sib koom ua ke thaum ib lub tshuab hluav taws xob txav tau yooj yim. Yog li nws zoo li ntawd melting point ntawm pob zeb diamond yuav tsum yog siab dua uas ntawm graphite vim in pob zeb diamond peb yuav tsum rhuav plaub covalent bonds thaum nyob rau hauv graphite tsuas yog peb daim ntawv cog lus.

Ntxiv mus, vim li cas lub melting point ntawm graphite qis dua pob zeb diamond?

Hauv graphite , txhua carbon atom txuas nrog peb lwm cov pa roj carbon atom los ntawm covalent bonds. Hauv pob zeb diamond txhua cov pa roj carbon atom txuas rau plaub lwm cov pa roj carbon atom los ntawm covalent bonds. Yog li nws zoo li paradoxical uas pob zeb diamond yuav muaj ib qis melting point . Txawm li cas los xij, cov khaubncaws sab nraud povtseg ntawm graphite muaj delocalized electrons.

Ib tug kuj yuav nug, yog vim li cas pob zeb diamond muaj lub siab melting point? Txhua carbon atom yog covalently bonded rau plaub lwm carbon atoms. Xav tau ntau lub zog los cais cov atoms hauv pob zeb diamond . Qhov no yog vim covalent bonds muaj zog, thiab pob zeb diamond muaj ntau ntau covalent bonds. Qhov no ua rau pob zeb diamond lub melting point thiab kub point heev siab.

Yog li ntawd, vim li cas lub melting point ntawm graphite siab?

Txawm li cas los xij, graphite tseem muaj heev siab melting thiab kub point vim tias muaj zog covalent bonds uas tuav cov carbon atoms ua ke nyob rau hauv cov khaubncaws sab nraud povtseg yuav tsum tau ib tug ntau ntawm tshav kub lub zog rau tawg.

Vim li cas lub melting point ntawm pob zeb diamond siab dua sodium chloride?

Cov ntawv cog lus hauv sodium chloride yog tsim nyog muaj zog ionic bonds thiab yog li nws muaj ib tug ncaj siab melting point ua 801c. Cov no yog cov ntawv cog lus muaj zog heev thiab yog li ntawd pob zeb diamond (thiab graphite) tsis yooj yim yaj . Qhov tseeb, cov tshuaj no tsis yog yaj tab sis sublime (tig rau hauv gaseous carbon atoms).

Pom zoo: