Chemistry 化學 (高級)

Unit 3A Fossil Fuels and Carbon Compunds (化石燃料和碳化合物)

1.      Warm house gas include CO₂, CH₄, CCl₂F, NO and O₃.

温室氣體有CO₂, CH₄, CCl₂F, NO and O₃.

2.      Polystyreneis a packing material

聚苯乙烯是一種包裝物料

1998 36. Which statements concerning polystyrene is/are correct? (1) It is a condensation polymer. (2) It can be remoulded. (3) It can be used to make packaging material for electrical appliances. A.   (1) only. B.   (2) only. C.   (1) and (3) only D.   (2) and (3) only                                                                                                 ANS: D

3.       Leaded petrol is being banned in Hong Kong

含鉛汽油在香港是被禁止的

1998           47.                   statement 1 The use of leaded petrol has been banned in Hong Kong statement 2 Lead compounds in car exhaust can cause damage to human brains.                                                                                                                           AND: B

4.      Hard water is a water containing Ca²⁺, Mg²⁺. They will form ppt with anion of detergent.

硬水含有Ca²⁺，Mg²⁺。它們與洗滌劑的陰離子反應產物沉澱物。

29. Which of the following substances is/are responsible for the hardness of water? (1) Sodium chloride. (2) Calcium chloride. (3) Potassium chloride. (4) Magnesium chloride. A.   (1) only. B.   (2) only. C.   (1) and (3) only D.   (2) and (4) only                                                                                                         ANS: D