When salt is added to water, all of the following happen except a. the water molecules surround the dissociated ions. b. the positive part of the water molecule is attracted to the negative ions. c. the negative part of the water molecule is attracted to the positive ions. d. the salt breaks into positive chlorine ions and negative sodium ions.

Option (d) is the correct answer.

Explanation:

When salt is added to water then the sodium and chlorine ions dissociate.

After the dissociation, both the positive and negative ions that is the sodium and chlorine ions will be surrounded by the water molecules. Thereafter, the positive part of water molecule will be attracted to the negative ions that is the chlorine ions and vice versa.

As sodium ion is a cation so it will hold a positive charge, and chlorine ion is an anion so it will hold a negative charge.

Thus, it can be concluded that when salt is added to water, all of the above will happen except option (d) that is the salt breaks into positive chlorine ions and negative sodium ions.

in the given question, the partial pressure is calculated by using the ideal gas equation, that is, pv = nrt

here, p is pressure, v is volume = 25 l, n is number of moles = 0.0104 moles, r is gas constant = -0.0821 l.atm / mol.k

t is temperature = 273 k

p = nrt / v

p = (0.0104 mol × 0.0821 l.atm / mol.k × 273 k) / 25 l

= 0.0093 atm

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.