03CE Paper2 about town gas

2009-02-28 9:45 am
Which statement is true?

(1)Town gas is produced from coal.
(2)Town gas contains hydrogen as the major component.
(3)Oxygen is added to enhance the flammability of town gas prior to its delievery to consumers.

Answer係2同3.
我知2點解, 但係3就唔明
TOWN GAS本身就唔係好Flammable,因為有H2, 但點解仲要加O2?

thanks~^^

回答 (2)

2009-03-04 2:27 am
✔ 最佳答案
(3) Oxygen is added to enhance the flammability of town gas prior to its delievery to consumers.


英文解釋:
This is because oxygen is flammable which can increase the flammability of town gas.
But you say that “ hydrogen(H2) in town gas is flammable.” It is wrong, it is because hydrogen(H2) is explosive only, but not flammable.


中文解釋:
煤氣(town gas)本身就唔係好易燃(flammable),加入帶有易燃性的氧氣(oxygen/ O2),可增加其而易燃性,而氫氣(hydrogen/ H2)不是易燃,而是帶爆炸性(explosive)。

∴ 所以statement (3)是正確。




希望幫到您!
2009-03-02 4:23 am
各下應該忘記燃燒有三個條件
1: 燃料 (即 天然氣 等)
2: 助燃料 (即 氧氣 oxygen gas)
3: 溫度達到燃點
此乃 火三角

明白左火三角
咁加入氧氣 o既目的
就係令天然氣混和有助燃作用之氧氣
以增加其易燃性
咁就係town gas


收錄日期: 2021-04-27 17:20:52
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