Chemistry, 20.11.2020 14:00 monyeemonyee12

If, in a particular process, reactants are able to form products, and products are also able to form reactants, then this process may be described as:. A. a reversible process. B. an elementary process. C. at equilibrium. D. forbidden. E. a forward process.

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Answer from: jayzelgaspar8441

A. Reversible Process

Explanation:

Going through the meaning of the options we have;

A Reversible: This reaction involves a backward and forward step.. This means that reactant would react to form products and products in turn wold react to form reactants. This is the correct option.

B. Elementary process: This refers to a single step reaction with a single transition state and no intermediates. This option is wrong because that is not what the question says.

C. Equilibrium Reaction: This refers to a reaction in which there is no change in the concentration of the reactants and products. Rate of forward reaction is equal to the rate of backward reaction.

D. Forbidden Reaction: This is not the correct option.

E. Forward process: This refers to the reaction that involves reactants reacting to form products. This is also not correct as the question states that the products are also able to form reactants.

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

; lc

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