Answer:
- <u><em>0.2 mol of CaCl</em></u><em><u>₂</u></em>
Explanation:
<em>Freezing point</em> depression of a solution, when a nonvolatile solute is dissolved in a solvent, is a colligative property, which means that it depends on the number of particles of solute dissolved.
The equation is:
![\Delta T_f=m\times k_f\times i](https://tex.z-dn.net/?f=%5CDelta%20T_f%3Dm%5Ctimes%20k_f%5Ctimes%20i)
Where:
- ΔTf is the decrease in the freezing point
- m is the molal concentration
- kf is the molal freezing point depression constant, which depends on the solvent
- i is the nan't Hoff factor, which accounts for the dissociation of ionic compounds.
Since the volume is the same for all the solutoins, the molal concentration will be higher for those solutions with more number of moles. Then, cross out the first two choices.
Since CaCl₂, in ideal conditions, dissociates into 1 Ca²⁺ ion and 2 Cl⁻ ions, the van't Hoff factor is 3, while for the molcecular C₆H₁₂O₆ it is 1.
Thus, the lowest freezing point will be produced by the sample of 0.2 mol of CaCl₂.
The answer is: gas
- First, we have to understand the 4 state of matter:
1) Solids: The molecular or ionic attracts each other by intermolecular forces. They connect with each other by strong convalent bonds that are hard to be broken in normal conditions. The heat energy is used to go through the weak intermolecular forces, So in a normal case, the solids usually have a stable shape.
2) Liquid: Unlike gases, It will take the container shape, and haven't the ability to change its volume to fill a container The intermolecular bonding is helping to give liquid its certain volume. Liquid able to flow and take any shape according to the container shape. The molecules of the liquid are closed together that is why it is hard to compress, the only high pressure will be able to compress it a little.
3)Gases: gases move rapidly in a straight line until it hit an object like the wall of the container then start to move with an aimless direction in a random way called random walk and unlike liquids, it can be compressed.
4) plasma: is unlike the gases, liquid and solid. It does not exist normally on the earth but we have to generate it from neutral gases.It has a neutral charge.
When sand and water are mixed in equal or unequal proportions, a heterogeneous mixture results.This mixture can be separated by following the processes of:
1)Sedimentation
2)Decantation
The mixture of sand and water is taken in a beaker and allowed to stand for sometime. The sand being heavier than water and insoluble in water settles at the bottom of the beaker. Next process is decantation.

Separate sand from water – Decantation
A process by which the clear liquid above the sediment is slowly separated by pouring out the liquid into another container. The clear liquid is called “supernatent” liquid.

Thus the separation of the mixture of sand and water can be achieved in two steps viz sedimentation and decantation.
Separate sand from water – Significance
The separation of a mixture does not involve any chemical reactions nor does it require any energy input.
The separation of a mixture involves only physical methods and the constituents can be recovered from the mixture without destroying any of the properties of either of the constituents.
The above methods of separation of sand from water support these observations. The methods of sedimentation and decantation are especially useful when the particle size of the insoluble impurity (sand in this case) is sufficiently big as to be isolated from the mixture without affecting the properties of either constituent.
These are some of the most common methods used in almost every house hold for many years to isolate the insoluble large particle sized impurities from water or from any solvent.
However the only drawback of this method is that the supernatant liquid is not obtained in a very pure form and the insoluble impurity has to be dried if it has to be obtained in the pure dry state.
The principle behind the sedimentation is that the insoluble impurities being heavier can easily settle down under the influence of gravity.
The importance of this process lies in the work of a river as the river flows on the surface of the earth. As the river corrodes the rocks and carries the broken pieces along its path downhill and flows through the plains the larger pieces of the rocks get deposited along the river bed and while it flows through the plains the finer particles get deposited in the river bed and the supernatant water with the soluble salts are carried away to the sea. The final result is large deposits of silt on the plains and the rich deposit
Answer:
<em>When an atom of hydrogen loses its electron it becomes positively charged.</em>
<h2>
<em>Hope</em><em> </em><em>it</em><em> </em><em>will</em><em> </em><em>help</em><em> </em><em>you</em><em>.</em><em>.</em><em>.</em><em>.</em><em>.</em><em>.</em><em>.</em><em>.</em></h2>
Answer:
group a
Explanation: because they are closet together
i think if it is wrong im sorry