請指教為何答案被認為是錯 - 教育講場

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教育王國 › 討論區 › 教育講場 › 請指教為何答案被認為是錯

查看: 857\|回覆: 8	go 請指教為何答案被認為是錯 [複製鏈接]

VIRUS

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發表於 18-1-16 20:41 |只看該作者 |倒序瀏覽 |打印

The equation of respiration : Food + oxygen →carbon dioxide + water + energy
The equation of burning : Fuel + oxygen→carbon dioxide + water +energy (heat and light)
Why is it that the teacher said both equations with energy could not be accepted as the correct answers?

0 0 0 0

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ABC-DAD

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	39589

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發表於 18-1-16 22:13 |只看該作者

Temperature?

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akys

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VIRUS 發表於 18-1-16 20:41
The equation of respiration : Food + oxygen →carbon dioxide + water + energy
The equation of burnin ...

如果當佢係一條Chemistry equation，就唔應該有 energy。

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Cheeselover

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VIRUS 發表於 18-1-16 20:41
The equation of respiration : Food + oxygen →carbon dioxide + water + energy
The equation of burnin ...

When we regard it as equation, we must balance both sides; either mass balance in engineering or mole balance in chemistry. The balance includes not only the numerical figures, but the unit also. Food, oxygen, CO2 and water can be expressed by weight, but not for energy (Theory of relativity is not applied here). Thus, your equation is invalid.

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cow

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回覆 VIRUS 的帖子

是對、不能說是錯，可以說不用寫。

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ABC-DAD

珍珠宮

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	39589

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發表於 18-1-17 11:42 |只看該作者

VIRUS 發表於 18-1-16 20:41
The equation of respiration : Food + oxygen →carbon dioxide + water + energy
The equation of burnin ...

好奇問下咩程度課程？

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planetearth

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發表於 18-1-17 20:18 |只看該作者

VIRUS 發表於 18-1-16 20:41
The equation of respiration : Food + oxygen →carbon dioxide + water + energy
The equation of burnin ...

本帖最後由 planetearth 於 18-1-17 21:22 編輯

In addition, consider conservation of energy law. Energy will just change forms, not being created. What is the energy applied at the left side and what is energy output? At the left side of the equation should be stored energy plus energy applied as input, the right side of the equation , there is energy output in other form.
During nuclear reaction, mass releases massive amount of energy, e=mc^2, applied, mass and energy are the same thing.

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planetearth

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發表於 18-1-17 21:49 |只看該作者

planetearth 發表於 18-1-17 20:18
本帖最後由 planetearth 於 18-1-17 21:22 編輯

In addition, consider conservation of energy law. E ...

This may be a better way to describe
Equation of respiration
Food+oxygen (stored energy) > Carbon dioxide+water (released energy as ATP)

Equation of burning
Fuel + oxygen (stored energy) > carbon dioxide+water (released energy as heat and light)

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ANChan59