Chemistry, 27.12.2019 06:31 dayjionneam

When the following redox equation is balanced with smallest whole number coefficients, the coefficient for sn(oh)3– will be bi(oh)3(s) + sn(oh)3–(aq) → sn(oh)62–(aq) + bi(s) (basic solution)

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Answer from: kiera2599

The coefficient of $Sn(OH)_3^{-}$ is 3 in the balanced redox reaction.

Explanation:

Oxidation reaction is defined as the chemical reaction in which an atom loses its electrons. The oxidation number of the atom gets increased during this reaction.

$X\rightarrow X^{n+}+ne^-$

Reduction reaction is defined as the chemical reaction in which an atom gains electrons. The oxidation number of the atom gets reduced during this reaction.

$X^{n+}+ne^-\rightarrow X$

For the given chemical reaction:

$Bi(OH)_3+Sn(OH)_3^{-}\rightarrow Sn(OH)6^{2-}+Bi$

The half cell reactions for the above reaction follows:

Oxidation half reaction: $Sn(OH)_3^{-}+3OH^-\rightarrow Sn(OH)6^{2-}+2e^-$

Reduction half reaction: $Bi(OH)_3+3e^-\rightarrow Bi+3OH^-$

To balance the oxidation half reaction must be multiplied by 3 and reduction half reaction must be multiplied by 2 thus, the balanced equation is:-

$3Sn(OH)_3^{-}+3OH^-+2Bi(OH)_3\rightarrow 3Sn(OH)6^{2-}+2Bi$

The coefficient of $Sn(OH)_3^{-}$ is 3 in the balanced redox reaction.

Answer from: Quest

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.

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.

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