SPM Chemistry(化学）急急急～ Chemistry这俩题怎样做？

ArianaCullen

各位SPM 化学大侠请救救我，我这俩题题目来自SPM Chemistry paper 3 section C， 请帮帮忙， 小女刚上中四什么都不适应，成绩一落千丈，不知如何是好


9. (a) Figure below shows the symbol representing an atom of sodium

                    nucleon no. : 23
                    proton no. : 11
                    symbol of element: Na

Based on the information given, elaborate the structure of sodium atom. your answer should include the diagram of electron arrangement and number of subatomic particles in the sodium atom.    (4 marks)

(b) Organic compound X is a solid at room temperature and pressure. The melting point of X is less than 100°C.                                 

(i) Describe a laboratory experiment to determine the freezing point of solid X. your answer should consist of following.

--> List of materials and apparatus required
--> Diagram showing the set-up of apparatus
--> Procedure of the experiment
--> Tabulation of data
--> Interpretation of data              (10 marks)

(ii) Describe the changes occurred in the arrangement of molecules, attractive forces between the molecules and the energy content of compound X when it is cooled from 100°C to room temperature.   (6 marks)


10. (a) (i) What is a chemical formula? (1 mark)
            (ii) State the qualitative and quantitative information that a chemical equation can provide. (3 marks)
        
       (b) (i) Name a metal which is less reactive than hydrogen in the reactivity series. (1 mark)
             (ii) Describe a laboratory experiment to determine the empirical formula of the oxide of the metal named in (b)(i) above. (10 marks)

(c) Nowadays, most of the cars are equipped with airbags that sodium azide, NaN3. Sodium azide decomposes quickly when heated to produce nitrogen gas and sodium. The gas prodeced will expand the air bag.
Calculate the mass of sodium azide required to produce just enough nitrogen gas to inflate an air bag of volume 35 dm3 at room conditions. (relative atomic mass: N,14; Na, 23; Molar volume of gas at room conditions = 24 dm3 mol-1)    (5 marks)

kaze1231

这是中四 第二课的吗？如果experiment的话多数参考书都有 我chemistry也没很好而且毕业两年了 帮不上太多忙

~^Magician^~

9. (a)

xiao.zhu

9b Naphthalene
Naphthalene is an organic compound with formula C10H8.
Melting point       
80.26 °C, 353 K, 176 °F
http://en.wikipedia.org/wiki/Naphthalene

ArianaCullen

kaze1231 发表于 2013-4-14 11:07 AM
这是中四 第二课的吗？如果experiment的话多数参考书都有 我chemistry也没很好而且毕业两年了 帮不上太多 ...

嗯～是第二课～请救救我T.T

ArianaCullen

~^Magician^~ 发表于 2013-4-14 11:08 AM
9. (a)

你还能再答吗？我真的不会，22我chemistry参考书念了还不会，上课又听不懂～

ArianaCullen

xiao.zhu 发表于 2013-4-14 11:36 AM
9b Naphthalene
Naphthalene is an organic compound with formula C10H8.
Melting point       

大侠还会吗？T.T 救命啊啊啊～

xiao.zhu

ArianaCullen 发表于 2013-4-14 12:02 PM
大侠还会吗？T.T 救命啊啊啊～

http://books.google.com.my/books ... 20point&f=false


refer activity 2.2

page 47

xiao.zhu

其实很多东西你google一下就有

ArianaCullen

xiao.zhu 发表于 2013-4-14 12:10 PM
其实很多东西你google一下就有

真的非常非常谢谢你。。。 那第10题的是哪一个experiment的？