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句容碧桂園學??茖W探究課堂之“神奇的化學”


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第一場由化學老師陳力老師主講——“神奇的化學。

(陳力:畢業于南京師范大學物理化學專業,主要研究方向為物理化學,研究生期間從事碳納米材料的制備,熒光特性研究及分析應用。 )

    The first talk was delivered by our very own Chemistry Teacher, Mr. Chen (A graduate from the Chemistry department of Nanjing Normal University. His main research is in the field of physical chemistry and carbo nano-materials.)

000

 

1.“彩虹杯 “Spectrum Beakers”

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酸堿指示劑能夠通過顏色的變化區分出溶液的酸堿性。在陳老師的指導下,一名學生將不同的酸堿溶液加到裝有指示劑的燒杯中,燒杯中液體顏色出現豐富多彩的顏色。

Through the use of colour, a pH indicator can tell us the pH value of a solution.  With Mr. Chen’s guidance, one of our students used the indicator with beakers filled with different solutions. The solutions showed the whole spectrum of colour demonstrating differing pH values.

2.消失的紅色 The End of Red!

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將氫氧化鈉加入事先混有無色酚酞的鹽酸溶液中,實驗先出現紅色,但馬上又褪去,直至溶液呈現紅色。

       A hydrochloric acid solution of phenolphthalein is usually colourless. However when adding sodium hydroxide, the solution all of a sudden turns a bright red before immediately disappearing again.

 

 

3.大象牙膏 Elephant Toothpaste

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將發泡劑、碘化鉀和雙氧水混合后,溶液迅速產生大量泡沫,并溢出圓底燒瓶。

By mixing foaming solution with potassium iodide and a hydrogen peroxide solution, a huge flurry of bubbles with fly out and the beaker will overflow.

 

4.蒸氣噴霧 Steam Spray

4

將黑色二氧化錳固體加入到雙氧水中,反應放出大量熱量,使液體瞬間沸騰轉變為水蒸氣。

    By placing black manganese dioxide in a hydrogen peroxide solution, a large amount of energy will be released, causing the solution to reach boiling point in the blink of an eye. This then

transforms into large quantities of steam.

 

5.飲料變色 Multi-coloured Drinks

5-25-1

碳酸鈉遇酚酞指示劑,溶液呈現為粉紅色,酷似雞尾酒,加入氯化鋇溶液后,變成乳白色的牛奶,再加入鹽酸后,溶液產生大量氣泡,變為無色的雪碧。

When sodium carbonate meets a phenolphthalein indicator, the solution will turn a bright pink, almost resembling a cocktail! When hydrochloric acid is added, a large quantity of bubbles are produced, the colour toning down to look like a glass of Sprite instead.

 

6.銀鏡反應 Silver Mirror Reaction

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硝酸銀、氨水、氫氧化鈉和葡萄糖溶液混合后,迅速搖晃,不一會兒,圓底燒瓶底部出現一層亮閃閃的銀鏡。

When a solution of silver nitrate, ammonia, sodium hydroxide and glucose is mixed together, it will quickly start to shake. Then after a small period of time, a layer of glistening silver will appear around the beaker.

 

2018年4月10日 11:32
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