Video: Koj ua li cas thiaj txiav txim siab qhov kub ntawm ib yam khoom?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Tshwj xeeb kub muaj peev xwm ntsuas los ntawm kev txiav txim npaum li cas kub lub zog yuav tsum tau nce ib gram ntawm ib yam khoom ib degree Celsius. Cov tshwj xeeb kub Lub peev xwm ntawm cov dej yog 4.2 joules ib gram ib degree Celsius lossis 1 calorie ib gram ib degree Celsius.
Ib sab ntawm qhov no, koj yuav ua li cas nrhiav tau qhov kub ntawm ib yam khoom?
Cov kub muaj peev xwm thiab cov tshwj xeeb kub muaj feem cuam tshuam los ntawm C = cm lossis c = C / m. Mas m, tshwj xeeb kub c, hloov kub ΔT, thiab kub ntxiv (los yog rho tawm) Q muaj feem cuam tshuam los ntawm kev sib npaug : Q=mcΔT. Tus nqi ntawm tshwj xeeb kub yog nyob ntawm cov khoom thiab theem ntawm ib tug muab yam khoom.
Tsis tas li ntawd, Q tshwj xeeb cua sov yog dab tsi? Q = kub zog (Joules, J) m = mass of a substance (kg) c = tshwj xeeb kub (units J/kg∙K) ∆ yog lub cim lub ntsiab lus "kev hloov hauv" ∆T = hloov kub (Kelvins, K)
Ntawm no, ib qho piv txwv ntawm cov cua sov tshwj xeeb yog dab tsi?
Piv txwv : 1. xam lub zog yuav tsum tau ua kom qhov kub thiab txias ntawm 2 kg ntawm dej los ntawm 20 ° C mus rau 100 ° C. Cov tshwj xeeb kub Lub peev xwm ntawm dej yog 4200 J / kg ° C. 2.
Dab tsi yog lub cim rau cov cua sov tshwj xeeb?
C
Pom zoo:
Yuav siv txoj hauv kev twg los txiav txim qhov purity ntawm txhua yam ntawm koj cov khoom uas tau rov qab los?
Cov txheej txheem tshuaj yooj yim tshaj plaws suav nrog gravimetry thiab titration. Kuj tseem muaj ntau txoj kev teeb pom kev zoo los yog spectroscopic, xws li UV-VIS spectroscopy, nuclear magnetic resonance thiab infrared spectroscopy. Cov txheej txheem chromatographic, xws li roj chromatography thiab kua chromatography, kuj tseem siv tau
Koj tuaj yeem sim ua li cas thiaj txiav txim siab seb qhov sib xyaw puas yog ionic lossis covalent?
Muaj ob peb txoj hauv kev los txiav txim siab seb daim ntawv cog lus yog ionic lossis covalent. Los ntawm kev txhais, daim ntawv cog lus ionic yog nruab nrab ntawm cov hlau thiab cov hlau tsis muaj hlau, thiab covalent daim ntawv cog lus yog nruab nrab ntawm 2 nonmetals. Yog li koj feem ntau tsuas yog saib ntawm lub rooj zaum thiab txiav txim siab seb koj cov khoom puas yog ua los ntawm cov hlau / nonmetal lossis tsuas yog 2 nonmetals xwb
Yuav ua li cas koj txiav txim siab yog hais tias ib yam khoom yog acidic los yog yooj yim?
Txhawm rau txiav txim siab seb cov khoom puas yog acid orabase, suav cov hydrogens ntawm txhua yam khoom ua ntej thiab tom qab cov tshuaj tiv thaiv. Yog hais tias tus naj npawb ntawm hydrogenshas txo cov tshuaj yog cov kua qaub (donates hydrogen ions). Yog tias tus naj npawb ntawm hydrogens tau nce ntxiv tias cov khoom yog lub hauv paus ( lees txais hydrogenions )
Ccal yog dab tsi thiab vim li cas koj thiaj li yuav tsum txiav txim siab Ccal rau lub calorimeter?
Los ntawm tus nqi ntawm cov dej hauv lub calorimeter thiab qhov kub thiab txias hloov los ntawm cov dej, qhov ntau ntawm cov cua sov absorbed los ntawm calorimeter, qcal, tuaj yeem txiav txim siab. Lub peev xwm kub ntawm lub calorimeter, Ccal, yog txiav txim los ntawm kev faib qcal los ntawm kev hloov kub
Yuav ua li cas koj txiav txim siab uas yog tus nqi txiav txim kauj ruam?
Tus nqi txiav txim siab kauj ruam yog kauj ruam qeeb tshaj plaws ntawm cov tshuaj tiv thaiv tshuaj uas txiav txim siab qhov nrawm (tus nqi) uas tag nrho cov tshuaj tiv thaiv ua tiav. Teb Tus nqi txiav txim kauj ruam yog kauj ruam thib ob vim nws yog kauj ruam qeeb. 2NO + 2H2 → N2 + 2H2O. Cov intermediates hauv cov tshuaj tiv thaiv no yog N2O2 thiab N2O