Answer: A. The compound CuCl is 500 times less soluble in sea water than it is in pure water.
pure water.
Explanation:
Any change in the equilibrium is studied on the basis of Le-Chatelier's principle.
This principle states that if there is any change in a equilibrium reaction, the equilibrium will shift in a direction so as to minimize the effect.
Thus when a common ion is introduced to an equilibrium reaction, the equilibrium will shift in a direction where the concentration of common ion is decreasing.
When common ion such as 
from NaCl in sea water is introduced to an equilibrium reaction, the equilibrium will shift in a direction where the concentration of common ion is decreasing i.e. in the left side and thus solubility of CuCl further decreases.
Option C: The dissociation of a polar covalent compound in water.
Sugar is made up of sucrose molecules containing polar covalent bonds. They have same type of oxygen-hydrogen covalent bonds that are present in water.
Since, sugar is not an ionic compound, option a and option b are incorrect. Also, due to same type of bonding in water and sugar molecules there will be no such force of attraction between them, this will opt out the option d.
Thus, dissolution of sugar in water is the dissociation of a polar covalent compound in water and option c is correct.
2.3g of sodium would be needed to create a 100 millimole concentration in one liter.
Given,
Mole of Na+ = 100 millimole
As we know that,
1 millimole = 10 -³ mole
Mole of Na+ in 100 millimoles = 100 × 10 -³ mole
= 0.1mole
<h3>What is Mole? </h3>
Mole is defined as the ratio of mass of Na+ to the molar mass of sodium.
<h3>What is Molar Mass? </h3>
The molar mass is defined as the sum of the total mass in grams unit of the atoms present to make a molecule per mole.
Mole of Na+ = mass of Na + / molar mass of Na +
0.1 = mass of Na + / 22.99 gl mol
Mass of Na + = 0.1 × 22.99
= 2.299 g
Mass of Na + = 2.3 g
Thus, we calculated that 2.3g of sodium would be needed to create a 100 millimole concentration in one liter.
learn more about moles:
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Tyson decided to exclude Pluto from the exhibits of planets because it displays the characteristics of an icy body rather than a planet.
