Baking with heat is a chemical change. Thaum koj noj cov khoom, koj hloov cov ntaub ntawv rau hauv ib yam dab tsi txawv, yog li ua brownies. Kev sim: … Ua kom cov brownies, peb yuav tsum tau siv daim ntawv qhia.
Puas ua ntej lub qhov cub puas muaj tshuaj lom lossis hloov lub cev?
Kub yog ib feem ntawm tshuaj tiv thaiv txheej txheemrau cov khoom ci ua nrog cov tshuaj tua kab mob, xws li cov hmoov ci. Thaum ci hmoov sib tov rau hauv ib lub batter los yog khob noom cookie, carbon dioxide npuas yog tsim, thiab tshwj tsis yog tias koj tau txais nws nyob rau hauv ib tug preheated qhov cub sai sai, cov khoom yuav tsis sawv li nws yuav tsum.
Puas yog cua sov hloov lub cev?
Kev siv cua sov rau qee yam tshuaj ua rau lub cev hloov pauv hauv uas tsis muaj cov tshuaj tshiab lossis cov tshuaj tsim tawm. Kev siv cua sov rau qee yam tshuaj ua rau muaj kev hloov pauv tshuaj, lossis tshuaj lom neeg, uas yog tsim los ntawm ib lossis ntau dua, nrog cov khoom sib txawv ntawm qhov qub.
Puas yog qhov cub hloov tshuaj?
Thaum koj ci ncuav mog qab zib, cov khoom xyaw khoom los ntawm kev hloov tshuaj. Kev hloov tshuaj lom neeg tshwm sim thaum cov molecules uas muaj ob lossis ntau dua cov tshuaj raug rov kho dua los tsim cov khoom tshiab! Thaum koj pib ci, koj muaj cov khoom xyaw sib xyaw.
Puas ua tshuaj hloov pauv lossis hloov lub cev?
Piv txwv tshuaj hloov pauvyog hlawv, ua noj, xeb, thiab rotting. Piv txwv ntawm kev hloov lub cev yog boiling, melting, khov, thiab shredding. Ntau yam kev hloov ntawm lub cev yog thim rov qab, yog tias muaj lub zog txaus. Tib txoj hauv kev los thim rov qab cov tshuaj hloov pauv yog los ntawm lwm cov tshuaj tiv thaiv.
