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[化學 Chem] Abandoned HKDSE Chem Mock Paper 1B



Abandoned HKDSE Chem Mock Paper 1B

[隱藏]
感覺自己出 Integrated Sciences 卷多於 Pure Chem

以下謹為拋磚引玉,
有錯勿屌

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HKDSE_Chemistry_Paper_1B_Worked1.pngHKDSE_Chemistry_Paper_1B_Worked2.pngHKDSE_Chemistry_Paper_1B_Worked3.pngHKDSE_Chemistry_Paper_1B_Worked4.pngHKDSE_Chemistry_Paper_1B_Worked5.pngHKDSE_Chemistry_Paper_1B_Worked6.pngHKDSE_Chemistry_Paper_1B_Worked7.pngHKDSE_Chemistry_Paper_1B_Worked8.pngHKDSE_Chemistry_Paper_1B_Worked9.png

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Question 8

1.000 gram of an organic molecule burns completely in the presence of excess oxygen. It yields 0.0333 mol of CO2 and 0.599 g of H2O. What is the empirical formula of the organic molecule? (8 marks)

[ 本帖最後由 DutalaTortoise 於 2020-1-12 06:21 AM 編輯 ]




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Solution to Question 8

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[ 本帖最後由 DutalaTortoise 於 2020-1-12 06:23 AM 編輯 ]

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Question 9

[隱藏]
An amateur welder melts down two metals to make an alloy that is 45% copper by mass and 55% iron(II) by mass. The alloy's density is 3.15 g/L. One liter of alloy completely fills a mold of volume 1000 cm3. He accidentally breaks off a 1.203 cm3 piece of the homogenous mixture and sweeps it outside where it reacts with acid rain over years. Assuming the acid reacts with all the iron(II) and not with the copper, how many grams of H2(g) are released into the atmosphere because of the amateur's carelessness? (8 marks)

[ 本帖最後由 DutalaTortoise 於 2020-1-12 06:24 AM 編輯 ]

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Solution to Question 9

Untitled.png

[ 本帖最後由 DutalaTortoise 於 2020-1-12 06:25 AM 編輯 ]

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Section B2

Question 10

(a) Draw the Lewis Structure of Hexane. (1 mark)
(b) Will hexane dissolve in water? Explain briefly. (3 marks)

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Solution to Question 10

(a)
0.png
(b)
Hexane and water have different intermolecular forces. Hexane is non-polar and the molecules are packed only by weak dispersion force, while water is polar and packed with hydrogen bonding. There is no eletronegative attractions between Hexane and water so these 2 chemical are non-miscible.




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Question 11

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From the 6 pairs above,
(a) Pick 2 structural isomers
(b)
Pick 2 of the same compounds.
(4 marks)

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Solution to Question 11

[隱藏]
(a) [ b], [d]
(b) [a], [e]

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Question 12

(a) Is C7H16 Alkane or Alkene? Explain briefly. (2 marks)
(b) Show all isomers of the compounds in (a). (6 marks)

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Solution to Question 12.

(a) Alkane. It is of the molecular formula C[n]H[2n+2]
(b)
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Question 13

*Discuss, with concrete examples and chemical equations, the chemical properties of hydrogen. (4 marks)
[1 mark will be awarded for effective communication.]




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Solution to Question 13

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Question 14

[隱藏]
(a) Tabulate the oxidation states and colours of various aqueous Vanadium ions. (4 marks)
(b) Tabulate the oxidation states and acidity of various Manganese oxides. (4 marks)

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