Chemistry, 20.09.2019 02:50 Animallover100

Hydrofluoric acid (hf) is used to etch glass (sio2). the products of the reaction are silicon tetrafluoride and water. write the balanced chemical equation.

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Answer from: o11011195

The balanced chemical equation is written below.

Explanation:

A balanced chemical equation is defined as the equation in which total number of individual atoms on the reactant side is equal to the total number of individual atoms on the product side. These equations follow law of conservation of mass.

When hydrofluoric acid reacts with glass or silicon dioxide, it leads to the production of silicon tetrafluoride and water.

The chemical equation for the reaction of two follows:

$4HF+SiO_2\rightarrow SiF_4+2H_2O$

By Stoichiometry of the reaction:

4 moles of hydrofluoric acid reacts with 1 mole of silicon dioxide to produce 1 mole of silicon tetrafluoride and 2 mole of water.

Hence, the balanced chemical equation is written above.

Answer from: Quest

"the periodic table is arranged in order of atomic number."

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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Hydrofluoric acid (hf) is used to etch glass (sio2). the products of the reaction are silicon tetraf...

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