[DSE化學2017]同學準備好DSE CHEM未?

1001 回覆
44 Like 6 Dislike
2017-04-12 17:29:57
上面話C2H2係邊題

Enthalpy gor題

Oh ty

等我以為我又有咩錯左
暫時p1錯左~8分，p2 3分
仲未計文字題啱唔啱

等睇d人背有side product
我覺得錯
Only C H, won't give side product

Why cannot? 2C + 3H2 -> C2H6
2017-04-12 17:30:22
上面話C2H2係邊題

Enthalpy gor題

Oh ty

等我以為我又有咩錯左
暫時p1錯左~8分，p2 3分
仲未計文字題啱唔啱

等睇d人背有side product
我覺得錯
Only C H, won't give side product

問咩？其實果題我淨係記得226
2017-04-12 17:31:19
上面話C2H2係邊題

Enthalpy gor題

Oh ty

等我以為我又有咩錯左
暫時p1錯左~8分，p2 3分
仲未計文字題啱唔啱

等睇d人背有side product
我覺得錯
Only C H, won't give side product

Why cannot? 2C + 3H2 -> C2H6

Only 2C H2 bor?
If consider 2C H2
I wrote u can't control the exact ratio of C:H into 2:1 to give C2H2
2017-04-12 17:32:10
我想問測試na+ 同k+果題可以寫溶左佢落水
之後睇顏色？

溶落水有咩顔色睇

笑左，記錯左野

以我所知，我地學Na+ K+ all salt soluble in water & no colour ga wor
2017-04-12 17:33:11
上面話C2H2係邊題

Enthalpy gor題

Oh ty

等我以為我又有咩錯左
暫時p1錯左~8分，p2 3分
仲未計文字題啱唔啱

等睇d人背有side product
我覺得錯
Only C H, won't give side product

Why cannot? 2C + 3H2 -> C2H6

Only 2C H2 bor?
If consider 2C H2
I wrote u can't control the exact ratio of C:H into 2:1 to give C2H2

But...
I rmb I did a Q before is that
C + 0.5 O2 -> CO

This can't be determined directly because C will react with O2 to form CO2 (side reaction)
2017-04-12 17:34:53

Enthalpy gor題

Oh ty

等我以為我又有咩錯左
暫時p1錯左~8分，p2 3分
仲未計文字題啱唔啱

等睇d人背有side product
我覺得錯
Only C H, won't give side product

Why cannot? 2C + 3H2 -> C2H6

Only 2C H2 bor?
If consider 2C H2
I wrote u can't control the exact ratio of C:H into 2:1 to give C2H2

But...
I rmb I did a Q before is that
C + 0.5 O2 -> CO

This can't be determined directly because C will react with O2 to form CO2 (side reaction)

Maybe both acceptable gwa
2017-04-12 17:35:17

Enthalpy gor題

Oh ty

等我以為我又有咩錯左
暫時p1錯左~8分，p2 3分
仲未計文字題啱唔啱

等睇d人背有side product
我覺得錯
Only C H, won't give side product

Why cannot? 2C + 3H2 -> C2H6

Only 2C H2 bor?
If consider 2C H2
I wrote u can't control the exact ratio of C:H into 2:1 to give C2H2

But...
I rmb I did a Q before is that
C + 0.5 O2 -> CO

This can't be determined directly because C will react with O2 to form CO2 (side reaction)

Oh 我記得啦，我寫類似impossible to control all C and O2 100% react into C2H2，所以冇可能直接測 (係咪呢題？)
2017-04-12 17:35:34

Oh ty

等我以為我又有咩錯左
暫時p1錯左~8分，p2 3分
仲未計文字題啱唔啱

等睇d人背有side product
我覺得錯
Only C H, won't give side product

Why cannot? 2C + 3H2 -> C2H6

Only 2C H2 bor?
If consider 2C H2
I wrote u can't control the exact ratio of C:H into 2:1 to give C2H2

But...
I rmb I did a Q before is that
C + 0.5 O2 -> CO

This can't be determined directly because C will react with O2 to form CO2 (side reaction)

Oh 我記得啦，我寫類似impossible to control all C and O2 100% react into C2H2，所以冇可能直接測 (係咪呢題？)

Yup
2017-04-12 17:36:09

Oh ty

等我以為我又有咩錯左
暫時p1錯左~8分，p2 3分
仲未計文字題啱唔啱

等睇d人背有side product
我覺得錯
Only C H, won't give side product

Why cannot? 2C + 3H2 -> C2H6

Only 2C H2 bor?
If consider 2C H2
I wrote u can't control the exact ratio of C:H into 2:1 to give C2H2

But...
I rmb I did a Q before is that
C + 0.5 O2 -> CO

This can't be determined directly because C will react with O2 to form CO2 (side reaction)

Oh 我記得啦，我寫類似impossible to control all C and O2 100% react into C2H2，所以冇可能直接測 (係咪呢題？)

H2
2017-04-12 17:36:35

Oh ty

等我以為我又有咩錯左
暫時p1錯左~8分，p2 3分
仲未計文字題啱唔啱

等睇d人背有side product
我覺得錯
Only C H, won't give side product

Why cannot? 2C + 3H2 -> C2H6

Only 2C H2 bor?
If consider 2C H2
I wrote u can't control the exact ratio of C:H into 2:1 to give C2H2

But...
I rmb I did a Q before is that
C + 0.5 O2 -> CO

This can't be determined directly because C will react with O2 to form CO2 (side reaction)

Maybe both acceptable gwa

你答乜？
2017-04-12 17:37:07

等我以為我又有咩錯左
暫時p1錯左~8分，p2 3分
仲未計文字題啱唔啱

等睇d人背有side product
我覺得錯
Only C H, won't give side product

Why cannot? 2C + 3H2 -> C2H6

Only 2C H2 bor?
If consider 2C H2
I wrote u can't control the exact ratio of C:H into 2:1 to give C2H2

But...
I rmb I did a Q before is that
C + 0.5 O2 -> CO

This can't be determined directly because C will react with O2 to form CO2 (side reaction)

Maybe both acceptable gwa

你答乜？

can't control the exact ratio of C:H into 2:1 to give C2H2
2017-04-12 17:37:41
hess law唔係overall enthalpy change same regardness route of reaction咩
另外想問cycle個題幾分？
2017-04-12 17:38:12

等睇d人背有side product
我覺得錯
Only C H, won't give side product

Why cannot? 2C + 3H2 -> C2H6

Only 2C H2 bor?
If consider 2C H2
I wrote u can't control the exact ratio of C:H into 2:1 to give C2H2

But...
I rmb I did a Q before is that
C + 0.5 O2 -> CO

This can't be determined directly because C will react with O2 to form CO2 (side reaction)

Maybe both acceptable gwa

你答乜？

can't control the exact ratio of C:H into 2:1 to give C2H2

其實你個答案同會出side product咪一樣
都係非100% 出C2H2
2017-04-12 17:38:36
hess law唔係overall enthalpy change same regardness route of reaction咩
另外想問cycle個題幾分？

Yes
Overall 4/5
2017-04-12 17:39:09

Why cannot? 2C + 3H2 -> C2H6

Only 2C H2 bor?
If consider 2C H2
I wrote u can't control the exact ratio of C:H into 2:1 to give C2H2

But...
I rmb I did a Q before is that
C + 0.5 O2 -> CO

This can't be determined directly because C will react with O2 to form CO2 (side reaction)

Maybe both acceptable gwa

你答乜？

can't control the exact ratio of C:H into 2:1 to give C2H2

其實你個答案同會出side product咪一樣
都係非100% 出C2H2

唔同 有機會做唔到C2H2 =/= 出side product
2017-04-12 17:39:35
hess law唔係overall enthalpy change same regardness route of reaction咩
另外想問cycle個題幾分？

Yes
Overall 4/5

連埋definition explanation計數 overall 4/5?
2017-04-12 17:40:20
hess law唔係overall enthalpy change same regardness route of reaction咩
另外想問cycle個題幾分？

Yes
Overall 4/5

連埋definition explanation計數 overall 4/5?

Definition 自己1分
Why 1分
成個cycle 好似4/5
2017-04-12 17:49:36
2018 dse考生
如果想攞5以上
應該要點溫
做啲咩去溫

中五應該教到eqm
建議你煲爆dse al acid base eqm
Chem命脈 所有野關佢事
2017-04-12 17:50:04
2018 dse考生
如果想攞5以上
應該要點溫
做啲咩去溫

中五應該教到eqm
建議你煲爆dse al acid base eqm
Chem命脈 所有野關佢事

你掌握到eqm 你化學贏人好多
2017-04-12 17:50:50
mc錯左十條 lq要幾多先有5
2017-04-12 17:51:13
如果我paper1A31/36,paper2大約25,paper1B幾多分先有5？
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