Chemistry, 06.07.2019 02:00, datands

Which is a feature of a single replacement reaction? substance xyz breaks down into x and yz. substance g reacts with compound xy to form gy and x. substance x burns rapidly in the presence of oxygen. substance qr and gt exchange ions with each other.

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answered: kay4451

Single replacement generally equals A + BC –––> AB + C, so B is the correct answer.

answered: sheabenitez305

Let us understand all the reactions

a) Substance XYZ breaks down into X and YZ: this is simple decomposition reaction

b) Substance G reacts with compound XY to form GY and X.

here G is replacing X in XY so this is single replacement reaction

c) Substance X burns rapidly in the presence of oxygen.

This is combustion reaction

d) Substance QR and GT exchange ions with each other

this is double displacement reaction

Substance G reacts with compound XY to form GY and X.

answered: Guest

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.

answered: Guest

girl imma just put my comment here because i need a couple point okurrttt

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Which is a feature of a single replacement reaction? substance xyz breaks down into x and yz. subst...