Chemistry, 17.07.2019 17:00 stgsry4003

Athermite reaction releases large amounts of heat and light, resulting in the melting of the iron metal that forms during the reaction. the balanced chemical equation is given below: fees001-1.jpgoes001-2.jpg + 2al es001-3.jpg ales001-4.jpgoes001-5.jpg + 2fe determine the correct mole ratios for the following substances, based on this chemical equation.

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Balanced chemical reaction: Fe₂O₃ + 2Al → 2Fe + Al₂O₃.
Fe₂O₃ is iron(III) oxide.
Al is aluminium.
Fe is iron.
Al₂O₃ is aluminium oxide.
In thermite reaction elemental aluminium reduces the iron (III) oxide or some other metal oxide.
Mole ratios from chemical reaction:
n(Fe₂O₃) : n(Al₂O₃) = 1 : 1.
n(Fe₂O₃) : n(Al) = 1 : 2.
n(Fe₂O₃) : n(Fe) = 1 : 2.

Answer from: kaliyab191

1:2

2:2

2:1

Explanation:

Right on edge 2021

Answer from: Quest

assuming that your periodic table has eighteen columns, you should highlight the four elements in the third column from the left of the table.

explanation

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the $3d$ have energy higher than those in the $4 s$ orbital while lower than those of the $4 p$ orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the $4s$ orbital is therefore filled right after $3p$ orbitals and before $3 d$ orbitals.

potassium has electron configuration $[\text{ar}] 4 s^{1}$ and calcium $[\text{ar}] 4 s^{2}$ . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration $[\text{ar}] 4 s^{2} \; 3d^{1}$ and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the $ns^{2} \; (n-1) p^{1}$ and should be highlighted as well.

Answer from: Quest

The answer is the first option just took the test

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Athermite reaction releases large amounts of heat and light, resulting in the melting of the iron me...

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