1) 上面兩樣野英文應該點講呢?

2) 點樣用英文講點樣去 carry out 一個 test 去 test the present of
　a) oxygen
　b) hydrogen
　c) carbon dioxide
呢 ?

thx

JR8753 :1) 上面兩樣野英文應該點講呢?

2) 點樣用英文講點樣去 carry out 一個 test 去 test the present of
　a) oxygen
　b) hydrogen
　c) carbon dioxide
呢 ?

thx

1. 帶星火的木條 Glowing splint, 燃燒中的木條 Burning splint
2a. It relights a glowing splint.
2b. A pop sound can be heard when placing a burning splint into the test tube which is filled with hydrogen gas.
2c. It extinguishes a burning splint.

1.Burning Splint,glowing splint

2.
Oxygen(For growing splint):It will re-light
Oxygen(For burning splint):It will burn more brightly.

Hydrogen:Put any metals(Beware not avilable for gold,sliver and copper,you can try magazieum,it is fast) into a test tube,then add some acid and stopper at the tube top,it will have some bubbles appear(Becareful,magazieum will pop out the stopper),after a few minutes,put a burning splint into the test tube,a "pop" sound will hear.

Carbon Dioxide:It can get carbon dioxide in a fire test.(Light a candle and use a beaker cover the candle,then candle will goes out of fire cause no oxygen)Then test on lime water or Hydrogencarbonate Indicator,then mix up them,you can see lime water change to milk colour and hydrogencarbonate indicator changes into yellow.

中二IS? 上學期做過e幾個實驗

IS書都係話Burning Splint同glowing splint

a)Oxygen relights a glowing splint.氧把帶餘燼的木條(Chemistry)重燃。
b)Use a burning splint.Hydrogen burns with a "pop" sound.用燃燒中的木條。氫燃燒時會發出爆鳴聲。
c)Use limewater(one word).Carbon dioxide turns colourless limewater milky.用石灰水。二氧化碳令透明的石灰水變成奶白色。

碳酸氫鹽指示劑(hydrogencarbonate indicator)一般係化學檢驗二氧化碳時唔使用。不過f.2 science的話仲可以用。

Thank you all of you