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irakobra [83]
3 years ago
6

What would you expect to happen to the energy while a piece of paper is burning?

Chemistry
2 answers:
abruzzese [7]3 years ago
6 0
D. 

Energy cannot be created nor destroyed. It is just transferred through sound, heat and light. 
Naddika [18.5K]3 years ago
3 0

Answer: D) There is the same amount of energy before paper is burned and after the paper is burned.

Explanation: The person above me is correct, the energy is just transferred, not created.

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Isolated i believe dont hold me to that
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A 0.04358 g sample of gas occupies 10.0-ml at 292.0 k and 1.10 atm. upon further analysis, the compound is found to be 25.305% c
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3 years ago
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luda_lava [24]

Answer:

a)

Fe^{2+}⇒Fe^{3+}+e^-

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b)

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Explanation:

A)

Remember that positive number superscripts mean electrons lack and negative numbers mean electrons 'excess' (if we compare it with the neutral element). So, for the case of Fe2+ which is converted to Fe3+, we know that in Fe2+ there is a two electrons lack, while in Fe3+ there is a 3 electrons lack; it means that Fe2+ was converted to Fe3+ but releasing one electron:

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The same analysis is applied to Br2; Br2 is a molecule which is said to have a zero superscript because it is an apolar covalent bond; and it is converted to Br-, which, according to what I wrote above, means that there is a one electron excess. So, Br2 must have received an electron in order to change to Br-; but Br2 can't change to Br- as simple as that because Br2 is a molecule, not an atom; it is a molecule that has two Br atoms, so, Br2 must give two Br- ions as products, but receiving one electron for each one:

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Cr3+ has a 3 electrons lack, and Cr2+ a two electrons one, so, Cr3+ must receive an electron to convert to Cr2+:

Cr^{3+}+e^-⇒Cr^{3+}

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I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!
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