Chemistry, 24.09.2019 19:00 destinyshanece08

Asalt sample is placed into some water and nearly all of it dissolve without stirring and heating. the resulting solution is

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Answer from: winnie45

In the concept of dissolving a soluble compound in water to form an aqueous solution, there are three types of solution: unsaturated, saturated and supersaturated/

Saturated solution is the limiting boundary among the three. This solution is made when the maximum amount of salt is added to the water. This can be manifested when you add another pinch of salt but does not dissolve even if you dissolve it. This is because it has reached its limit. Below this is the unsaturated solution where it dissolves all of the solute. Supersaturated solution is when you force the solution to dissolve the additional salt even if it saturated already. This can be possible if you heat the solution.

Therefore, since the solution still dissolves the salt without heating and even without stirring, the resulting solution is still an unsaturated solution.

Answer from: Quest

when atmosphere interacts with biosphere they focuses on on the sources and sinks of green house gases (ghgs) air pollutants, particular matters, water and energy between the earth's surface and the atmosphere. the biosphere affects the climate. the atmosphere and biosphere are in constant interaction with each other, and all living things rely on gases in the atmosphere for life. organisms such as animals take in oxygen gas form the atmosphere to use in every cell of their body for smooth functioning of daily routine exercises.

What happens when the atmosphere interacts with biosphere

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.