Video: Lub peev xwm tshwj xeeb ntawm octane yog dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Octane
| Cov npe | |
|---|---|
| Thaum tshav kub kub muaj peev xwm (C) | 255.68 J K−1 mol−1 |
| Std molar entropy (So298) | 361.20 J K−1 mol−1 |
| Std enthalpy ntawm kev tsim (ΔfH?298) | −252.1–248.5 kJ mol−1 |
| Std enthalpy ntawm combustion (ΔcH?298) | 5.53–5.33 MJ mol−1 |
Kuj paub, dab tsi yog qhov tshwj xeeb kub ntawm octane?
Kev daws: Cov tshwj xeeb kub ntawm octane , C8H18 (l), yog 2.22 J/g K.
Tsis tas li ntawd, lub peev xwm tshwj xeeb ntawm cov kua dej yog dab tsi? Dej muaj qhov siab tshaj plaws tshwj xeeb kub muaj peev xwm ntawm tej ua kua . Tshwj xeeb kub yog txhais raws li tus nqi ntawm kub ib gram ntawm cov khoom yuav tsum nqus los yog poob kom hloov nws qhov kub thiab txias los ntawm ib degree Celsius. Rau cov dej, tus nqi no yog ib calorie, lossis 4.184 Joules.
Tsis tas li ntawd, lub peev xwm tshwj xeeb ntawm cov roj av yog dab tsi?
| Khoom | Tshwj xeeb tshav kub - cp - | |
|---|---|---|
| (kJ / (kg K)) | (Btu/(lb oF)) (Kcal / kg oC) | |
| Roj Min. | 1.67 | 0.4 |
| Roj Roj max. | 2.09 | 0.5 |
| Roj av | 2.22 | 0.53 |
Dab tsi yog qhov tshwj xeeb kub peev ntawm paraffin?
Paraffin wax yog ib yam khoom zoo heev rau khaws cia kub ,cu ib tshwj xeeb kub muaj peev xwm ntawm 2.14–2.9 J g−1 K−1 (joules ib gram kelvin) thiab a kub fusion ntawm 200-220 J g−1.
Pom zoo:
Lub luag haujlwm ntawm CDK yog dab tsi hauv lub cev ua haujlwm ntawm tes tshwj xeeb hauv lub voj voog ntawm tes?
Los ntawm phosphorylation, Cdks teeb liab lub xov tooj ntawm tes uas nws tau npaj kom dhau mus rau theem tom ntej ntawm lub voj voog ntawm tes. Raws li lawv lub npe qhia, Cyclin-Dependent Protein Kinases yog nyob ntawm cyclins, lwm chav kawm ntawm kev tswj hwm cov protein. Cyclins khi rau Cdks, ua kom cov Cdks rau phosphorylate lwm cov molecules
Nws txhais li cas yog tias ib yam khoom muaj lub peev xwm kub tshwj xeeb?
Cov cua kub tshwj xeeb yog Jg−oK. Yog li, tus nqi siab txhais tau hais tias nws yuav siv ntau lub zog los tsa (lossis qis dua) nws qhov kub thiab txias. Ntxiv cov cua sov rau qhov "tseem ceeb tshwj xeeb" qhov sib xyaw ua ke yuav ua rau nws qhov kub thiab txias sai dua li ntxiv cov cua sov rau cov cua kub tshwj xeeb
Dab tsi yog qhov txawv ntawm electrostatic muaj peev xwm thiab electrostatic muaj peev xwm zog?
Tsis muaj qhov sib txawv ntawm electrostatic potentialenergy thiab hluav taws xob (al) muaj peev xwm zog. Lub peev xwm hluav taws xob ntawm ib qho taw tes yog kev ua haujlwm los ntawm lwm qhov kev quab yuam hauv kev txav chav tsev zoo los ntawm ib qho arbitrarilychosen xoom ntawm lub peev xwm (feem ntau infinity) mus rau lub ntsiab lus
Puas muaj peev xwm hluav taws xob thiab lub zog muaj peev xwm tib yam Vim li cas lossis vim li cas ho tsis?
Lub zog muaj peev xwm hluav taws xob Ue yog lub zog muaj peev xwm khaws cia thaum cov nqi tawm ntawm qhov sib npaug (xws li lub zog muaj peev xwm gravitational). Lub peev xwm hluav taws xob zoo ib yam, tab sis ib tus nqi, Ueq. Ib qho hluav taws xob muaj peev xwm sib txawv ntawm ob lub ntsiab lus hu ua voltage, V = Ue2q−Ue1q
Thaum tshav kub kub muaj peev xwm vs tshwj xeeb tshav kub yog dab tsi?
Molar Thaum tshav kub kub muaj peev xwm yog ib qho kev ntsuas ntawm cov cua sov uas tsim nyog los nce qhov kub ntawm ib mole ntawm ib tug ntshiab tshuaj los ntawm ib tug degree K. Tshwj xeeb kub muaj peev xwm yog ib qho kev ntsuas ntawm tus nqi ntawm cov cua sov tsim nyog los nce qhov kub ntawm ib gram ntawm ib tug ntshiab. khoom los ntawm ib degree K