化學榮譽證

1) 定義下列各項︰

a) 元素 (Elements)
b) 化合物 (Compounds)
c) 化學符號 (Chemical Symbols)
d) 溶液 (Solutions)
e) 原子 (Atoms)
f) 分子 (Molecules)
g) 元素周期表 (Periodic table)
h) 燃燒 (Combustion)
i) 酸 (Acid)
j) 鹽 (Salt)
k) 質子 (Proton)
l) 中子 (Neutron)
m) 電子 (Electron)
n) 蒸餾法 (Distillation)
o) 分餾法 (Fractional Distillation)
p) 過濾 (Filtration)

2) 了解甚麼氣體可用來滅火並其原理。解釋其中一種化學滅火筒的原理。

3) 舉出兩個一氧化碳的常見來源,並說明為何它是危險性的。

4) 指出物質的有何種形態。

5) 完成下列其中五項,並解釋當中的化學作用︰

a) 嘗試點燃一塊方糖,起初不放灰在方糖上,然後就放一些,這樣會展示了催化劑的作用。
b) 放一塊冰在一杯水內,然後放一條四吋長的線在杯上,嘗試不用手碰到冰而拿它出來。
c) 使用水、松節油及肥皂,使一幅報紙上的圖片變成白紙。
d) 使用一支蠟燭和一張卡紙,展示出燭火的三個部份給別人看。
e) 使用一碗水、一些木火柴、一堆砂糖和一些肥皂,展示糖及肥皂對於浮著的火柴的影響。
f) 把一隻鮮雞蛋放進清水內,然後放在鹽水內,留意當中的差別。
g) 以鐵線、鉛筆、一條橡皮筋、一個水杯及一碟水,展示生鏽(rust)會使用掉氧氣。
h) 展示出下列各項被燃燒時所發出的顏色︰鹽、銅、硫酸鹽(sulfate)及硼酸(boric acid)。
i) 製作隱形墨水。
j) 證明洗衣石鹼(washing soda)或碳酸鈉(sodium carbonate)藏有水份。

 

Level 2

English Version:

1. Define the following:
a. Elements
b. Compounds
c. Chemical Symbols
d. Solutions
e. Atoms
f. Molecules
g. Periodic table
h. Combustion
i. Acid
j. Salt
k. Proton
I. Neutron
m. Electron
n. Distillation
o. Fractional Distillation
p. Filtration

2. What gasses extinguish life, and how? Explain the principle of one kind of chemical fire extinguisher.

3. Name two common sources of carbon monoxide. Why is it dangerous?

4. What are the states of matter?

5. Do five of the following, and explain the chemical action that takes place:
a. Try to light a sugar cube, first without and then with some ash applied to the cube, thus showing the action of a catalyst.
b. Place an ice cube in a glass of water, place a four inch string on top of the glass and ice, then solve the problem of taking the ice cube out of the water without touching it.
c. With the use of water, turpentine, and soap, transfer a newspaper picture to a blank sheet of paper.
d. With the use of a candle and a piece of cardboard, demonstrate visually the three parts of a candle flame.
e. With the use of a bow I of water, wooden matchsticks, a lump of sugar, and some soap, demonstrate the action of sugar and soap on the floating matchsticks.
f. Place a fresh egg in fresh water and then salt water, noting the difference.
g. Demonstrate that rust uses up oxygen with the use of steel wool, a pencil, a rubber band, a water glass, and a dish of water.
h. Demonstrate the colors produced when the following are burned: salt, copper, sulfate, and boric acid.
i. Make an invisible ink.
j. Show that washing soda or sodium carbonate contains water.

 

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