Chemistry, 06.05.2020 20:09 ashanti93

Wody słone na Ziemi występują w morzach i oceanach. Wody słodkie to woda zawarta w lodowcach ,wody podziemne ,wody powierzchniowe , woda w atmosferze i glebie. Wody słodkie stanowią 2,8 % zasobów wodnych Ziemi ,reszta- 97,2 %- to wody słone. Woda w lodowcach stanowi 82% wody słodkiej, 14% wody słodkiej to wody podziemne, 3% stanowią wody powierzchniowe , a reszta to wody w atmosferze i glebie. Narysuj w zeszycie kwadrat o powierzchni 100 cm 2 , który będzie przedstawiał 100 % zasobów wodnych Ziemi. W kwadracie tym zaznacz zawartość procentową każdego rodzaju wody i sformułuj wnioski. Proszę pomózcie!! Nie rozumiem tego :(. Daje Naj!

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Answer from: Quest

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).

Answer from: Quest

There is one s orbital, and there are three p orbitals, five d orbitals, and seven f orbitals. thus, the answer is b. do not confuse the number of orbitals in a subshell with the number of electrons the subshell can hold. each orbital can hold two electrons, so the capacity of an nf subshell is 14 electrons.

Answer from: Quest

Because electrons have negligible mass, to account for the mass of the isotope, there must be 16 neutrons, 16 neutrally charged, massive, fundamental particles present in the sulfur nucleus. and thus finally, if we have the 32s2− ion, there are 18 electrons, 16 protons, and 16 neutrons.

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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Wody słone na Ziemi występują w morzach i oceanach. Wody słodkie to woda zawarta w lodowcach ,wody p...