[DSE化學2019]同學準備好DSE CHEM未?

有catalyst會行新mechanism
雖然通常會多左steps 但無講過一定會
btw果題你畫多個peak都唔理你

唔係計加埋 最高Ea個step唔高過without catalyst果陣就ok

yes 2015開始cut左 得返VA
HKEAA個teacher notes有講明改左咩
https://www.edb.gov.hk/attachment/en/curriculum-development/kla/science-edu/ref-and-resources/Supplementary_note_for_Chem_30Oct2015_e.pdf

多謝d同學咁熱心肯提供d真跡出黎先做到
同埋我覺得呢d野遲早要有人行出黎做 真係有人讀書叻但考試廢 淨睇書唔識答題死十次都唔掂

至於鍾意chem 我會話係由鍾意教chem去引發呢件事
所以係大學grad左後先更鍾意chem
果時送曬d書比組仔女 過幾年都重新買過曬

同埋研究下點將d chem既觀念present到人人都識 絕對唔簡單得過chem本身

chemical cell with insert electrodes 係咪要 list 哂 OA 同 RA 之後再 identify strongest OA 同 strongest RA?

原則上係
同埋要留意揀果兩隻OA RA組合喺ecs上可唔可以spontaneous reaction
因為cell唔同electrolysis 要靠OA RA反應黎推動

無define既就叫standard enthalpy change of reaction (dHr)
直接跟條equation每種物質各自既coefficient行一次既enthalpy

standard enthalpy change of decomposition就指明要decompose果個fix 1 mole

你define唔到果d咪叫enthalpy change of reaction
佢要指明個主角先有得define
例如standard enthalpy change of decomposition of XXX 咁

因為計standard enthalpy change基本上一定係1 mole of XXX is decomposed (dH[XXX])
計出黎個數係kJ mol-1 (heat change per mole of XXX is decomposed)
得enthalpy change of reaction先唔洗主角

未anodize前有好多細孔 做到密封就會停

巴打點解2018 cut off 高左咁多