Chemistry, 30.06.2019 02:30, ghernadez

Which is a type of heat transfer that causes the air at the top floor of a building to be hotter than the air at the bottom floor of a building?

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answered: jteh

Answer;

Convection

Explanation;Convection is on of the form heat transfer others being radiation and conduction.Convection involves transfer of heat in fluids, that is gases and liquids. The transfer by convection is enhanced by convection currents.Convection currents are circular paths through which the hot lighter fluid moves to the top and the denser cold fluid moves to the bottom. This enhances heat exchange between the hot fluid and the cold fluid as a result of temperature difference.Therefore, convection is the type of heat transfer that explains why the air at the top floor of a building is hotter than the air at the bottom of the building.

answered: Dianar4308

Confirmed correct answer is convection.

answered: Guest

You know how the first one if filled up like the objects do the same but with the other categories

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.

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Which is a type of heat transfer that causes the air at the top floor of a building to be hotter tha...