唔該巴打[DSE化學2019]同學準備好DSE CHEM未?
化學艾維斯
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屌係喎 唔該巴打
唔該巴打唔該
Maxwell -Boltzmann 幅圖入面，如果溫度上升 條curve 會唔同左，但點解T1同T2 條curve 下面嘅area 都係remain the same ？
因為total number of particles remain unchanged
Diamond同graphite比 係咪diamond既m.p高d
個解釋係咪因為diamond has a rigid tetrahedral structure. C atoms covalently bonded with other C atoms. 但graphite就得weak v.d.w force between layers所以低d
但點解網上有d話係graphite高d呢
個解釋係咪因為diamond has a rigid tetrahedral structure. C atoms covalently bonded with other C atoms. 但graphite就得weak v.d.w force between layers所以低d
但點解網上有d話係graphite高d呢
其實係graphite高d
因為graphite layer入面既可以delocalize 令C-C bond strength會勁左(bond order around 1.33 即勁過single但弱過double bond) 情況類似benzene ring (bond order 1.5)
graphite layer vdw force係解釋佢硬度低 但melting point講緊要break埋d C-C bond
因為graphite layer入面既可以delocalize 令C-C bond strength會勁左(bond order around 1.33 即勁過single但弱過double bond) 情況類似benzene ring (bond order 1.5)
graphite layer vdw force係解釋佢硬度低 但melting point講緊要break埋d C-C bond
Diamond同graphite比 係咪diamond既m.p高d其實係graphite高d
個解釋係咪因為diamond has a rigid tetrahedral structure. C atoms covalently bonded with other C atoms. 但graphite就得weak v.d.w force between layers所以低d
但點解網上有d話係graphite高d呢
因為graphite layer入面electron既可以delocalize 令C-C bond strength會勁左(bond order around 1.33 即勁過single但弱過double bond) 情況類似benzene ring (bond order 1.5)
graphite layer vdw force係解釋佢硬度低 但melting point講緊要break埋d C-C bond
原來係咁 唔該曬
想問下 hydrolysis of ester,
如果用acid, 條equation 係咪要寫個水係到
RCOOR + H2O ---> RCOOH + ROH
然後箭咀上面再寫 H+ 咁?
唔寫水 淨寫 H+ 得唔得
如果用acid, 條equation 係咪要寫個水係到
RCOOR + H2O ---> RCOOH + ROH
然後箭咀上面再寫 H+ 咁?
唔寫水 淨寫 H+ 得唔得
寫埋H2O 呢個情況水真係reactant
H+係catalyst
H+係catalyst
點解 c ii)
Ca(OH)2 (aq) 唔可以拆個Ca2+ 出黎
之後同右邊約左佢？
Ca(OH)2 (aq) 唔可以拆個Ca2+ 出黎
之後同右邊約左佢？
咁係佢條式既問題啫 要約咪寫H+ + OH- -> H2O
即係本書錯？
你可以google其他人點寫再判斷
唔好淨係信一本textbook或者我一條友講
唔好淨係信一本textbook或者我一條友講
我只係覺得係同我地學既野有出入
因為寫得aq 應該可以拆
因為寫得aq 應該可以拆
寫左aq既salt or acid/alkali等就可以拆
咁我堅持我既諗法啦
想問
SO2 可唔可以 reduce iron oxide to extract Fe ?
SO2 可唔可以 reduce iron oxide to extract Fe ?
做an chem 題目有時唔係好明, 通常叫你講一種 test 去分辦 chemical, 個方法係咪唔需要 specific only to the chemical? 例如
"Suggest a chemical test for detecting sulphur dioxide gas" 個答案係加K2Cr2O7/H+, 但其實好多野都可以 reduce dichromate 架wo, SO2 只係其中一種
"Suggest a chemical test for detecting sulphur dioxide gas" 個答案係加K2Cr2O7/H+, 但其實好多野都可以 reduce dichromate 架wo, SO2 只係其中一種
如果係distinguish既情況 只需做到兩個sample有明顯分辦得到既observation就ok
如果要好specific去detect一個species 其實現階段大部分學過既test都唔得 SO2果個用OA都唔得 但可以add test再test出黎隻gas (SO2)
如果要好specific去detect一個species 其實現階段大部分學過既test都唔得 SO2果個用OA都唔得 但可以add test再test出黎隻gas (SO2)
唔該哂
distinguish 果到我明 但咁啱 2017 呢條問 "detect", 所以有D 估唔到佢想點
distinguish 果到我明 但咁啱 2017 呢條問 "detect", 所以有D 估唔到佢想點
呀sir 可唔可以抽個時間答下
blue litmus paper係咪都得
turns red and then becomes white?
turns red and then becomes white?
i mean呢題既requirement
detect到佢有既property係咪就可以？
detect到佢有既property係咪就可以？