Chemistry, 25.01.2020 18:31 phillswift2020

What would be the first thing you would do if you are burned by a chemical while performing a lab experiment?

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Answer from: RanTam

The first step is to clean the burned area with cool water. If the chemical is an acid, you apply a base like soap. If it is a base, you clean it with water. if the condition remains the same then take sodium pellet and apply on the burnt area..!!!

Answer from: Geo777

Flood the affected area with cool water for at least 20 minutes. While doing so, determine what exact chemical has created the burn and respond accordingly. Also, ask for assistance from your lab consultant right away.

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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 teacher is mostly talking about the distillation of a mixture

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