CE--crossover 題
A student added a ball of calcium in concentrated hydrochlorice acid.(有個學生把球狀的鈣加入了濃鹽酸中。)
Chin
根據<<花潮>>一文，試比較該化學反應與海棠花盛開的相似之處。
Eng
A student wrote the following report:
"OK, as I am new to these experiment,
let me made a brief note of it.
The reaction was exothermical and exciting.
The calcium burn in brick-red flame,
and finally dissolved water."
There is a mistake in each single line. Correct it.
Math
It is known that the volume of gas given out, x dm3, is partly proportional to the mass of the ball, h kg, and partly proportional to the mass of hydrogen ions, k g. x=125 when h=120 and k=240 000. x=250 when h=240 and k=480 000. Write down an equation showing x in terms of h and k.
AMath
Assume the ball dissolves evenly, ie. keeping spherical. The rate of reaction depends on the surface area of the ball. Find the rate of change of mass when the rate of reaction is 5cm2/s
Phy
The ball moved quickly on the water surface at a speed of 10m/s. If it rebounded at the same speed after hiting the wall of the beaker and the contact time is 0.003s, find the average force acted by the ball on the beaker wall.
Chem
Give ONE safety precaution when doing this experiment.
Bio
State ONE use of calcium in our bodies and explain what would happen if that function is disabled.
PA
In order to measure the rate of reaction, the student first measured it according to the volume of gas formed. But in the second time he measured it according to the change in temperature. Explain why it is not appropriate with ONE Accounting concept you have learnt.
RS
Teenagers nowaday enjoy doing dangerous things. If you are a Christian, how would you encourage them not to do these? Give THREE ways and support each with a Bibical teaching.
copy form my friend's xanga 無聊:icon032: Originally posted by STAM at 2005-5-31 06:09 PM:
無聊:icon032:
我好似post 錯板:icon032: Originally posted by 晉文公 at 2005-5-31 06:11 PM:
我好似post 錯板:icon032:
post去邊個topic都會沉底..:icon101: 哈 PA
There is inconsistency in the method of measuring.:o Originally posted by STAM at 31-5-2005 06:17 PM:
post去邊個topic都會沉底..:icon101:
咁直接
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