Qhov sib txawv ntawm lub cev thiab tshuaj hloov pauv yog qhov hloov pauv lub cev tsuas yog hloov cov duab thiab qhov loj ntawm cov tshuaj thaum hloov tshuaj lom neeg ua rau tag nrho cov khoom tshiab.
Muaj ntau tus uas yuav raug ntxias hais tias kev hloov pauv yog qhov hloov pauv thiab vim li cas thiaj li cuam tshuam rau qhov sib txawv ntawm lub cev thiab tshuaj hloov pauv. Tab sis nws yog ib qho tseem ceeb kom nkag siab qhov sib txawv ntawm ob hom kev hloov pauv no vim lawv cuam tshuam rau peb lub neej thiab ib puag ncig.
Lub cev hloov pauv yog dab tsi?
Koj yuav tsum tau pom cov kev hloov pauv hauv lub neej txhua hnub thiab. Koj lub fridge hloov dej rau hauv dej khov thiab koj lub tshuab nqus dej hloov dej rau hauv chav. Ob qho tib si yog kev hloov ntawm lub cev vim lawv tsuas yog hloov daim ntawv ntawm cov teeb meem thiab cov kev cuam tshuam rov qab los. Cov dej khov tau hloov pauv mus rau hauv dej thaum lub qhov cub kuj hloov mus rau hauv dej thaum txias. Thaum koj tsoo lub kaus poom, koj tsuas yog ua rau lub cev hloov pauv ntawm cov duab thiab qhov loj ntawm lub kaus poom. Ib yam li ntawd, thaum koj ntxiv ntsev lossis suab thaj rau hauv dej los ua cov kev daws teeb meem, nws yog ib qho kev hloov ntawm lub cev raws li koj tuaj yeem yooj yim cais cov ntsev thiab suab thaj los ntawm kev daws kom tau cov khoom qub.
Daim duab 01: Qee Cov Piv Txwv Lub Neej Ntawm Kev Hloov Lub Cev
Piv txwv ntawm qee qhov kev hloov ntawm lub cev muaj xws li hauv qab no:
- Kev txiav ib daim ntawv rau hauv me me
- Tswv dej khov
Tshuaj Hloov Pauv yog dab tsi?
Kev hloov tshuaj lom neeg yog cov tshuaj tiv thaiv uas teeb meem hloov mus rau lwm yam teeb meem. Cov tshuaj tiv thaiv yog irreversible thiab koj tsis tuaj yeem rov qab tau cov khoom ua ntej. Thaum lub cev ntawm koj lub tsheb xeb, nws yog ib qho kev hloov tshuaj (oxidation ntawm hlau los tsim xeb). Ib yam li ntawd, thaum koj hlawv ntoo, koj tau tshauv thiab charcoal uas muaj cov khoom sib txawv ntawm cov ntoo thiab koj tsis tuaj yeem thim cov txheej txheem kom rov qab ntoo. Ntawm qhov tod tes, txawm muaj pes tsawg daim me me ntawm daim ntawv koj txiav, nws tseem yog daim ntawv thiab tsis muaj kev hloov pauv ntawm nws cov khoom; li no nws tsis yog kev hloov tshuaj, tab sis hloov lub cev. Tab sis yog tias koj hlawv ntawv, qhov koj tau txais yog carbon thiab tsis yog ntawv. Yog li kev hloov pauv, yog tias nws ua rau tag nrho cov khoom sib txawv yog kev hloov tshuaj lom neeg (thaum yog tias cov khoom ntawm cov khoom tseem zoo li qub, nws hu ua kev hloov lub cev).
Daim duab 02: Hlawv Ntoo yog qhov piv txwv zoo ntawm kev hloov tshuaj
Piv txwv ntawm qee cov tshuaj hloov pauv suav nrog:
- Kub ntoo
- Browning of food
- Ua qe
- Sib tov cov kua qaub nrog cov hauv paus
Nyob zoo ib tsoom phooj ywg sawv daws
Qhov txawv ntawm lub cev thiab tshuaj hloov pauv yog dab tsi?
Lub cev vs tshuaj hloov pauv |
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| Ib hom kev hloov pauv uas daim ntawv hloov pauv tab sis ib yam khoom tsis hloov mus rau lwm qhov. | Ib txheej txheem uas ib lossis ntau yam khoom raug hloov ua ib lossis ntau yam tshiab thiab txawv. |
| Kev hloov pauv | |
| Lub cev hloov pauv hloov tau | Tshuaj hloov pauv tsis tau. |
| Kev hloov pauv sai | |
| Lub cev hloov pauv sai. | Tshuaj hloov pauv qeeb. |
| Properties | |
| Tsuas yog lub xeev hloov pauv thaum nws tseem muaj cov khoom qub. | Cov khoom tshiab tsim muaj tag nrho cov khoom sib txawv. |
Summary – Physical vs Chemical Change
Hloov cov teeb meem tuaj yeem yog lub cev lossis tshuaj lom neeg. Qhov sib txawv ntawm lub cev thiab tshuaj hloov pauv yog qhov hloov pauv lub cev tsuas yog hloov cov duab thiab qhov loj ntawm cov tshuaj thaum hloov tshuaj lom neeg ua rau tag nrho cov khoom tshiab.
