Astudent has a solution of sodium nitrate and believes it is saturated. which statement provides the best evidence that the solution is saturated?
a) when more water is added, the appearance of the solution doesn’t change.
b) when some of the water evaporates, all of the sodium nitrate remains dissolved.
c) when a small amount of sodium nitrate is added, a large amount precipitates from the solution.
d) when additional sodium nitrate is added, it all settles to the bottom of the container.
e) when the temperature of the solution is increased, additional sodium nitrate can be dissolved.

D

Explanation:

saturated means that no more of the substance will dissolve. Anything that doesn't dissolve will settle to the bottom.

answer: - 3.) the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.

solution: - as per the rules, oxidation number of oxygen in its compounds is -2. the sum of oxidation numbers of all the elements of a molecule or compound is zero.

also, the oxidation number in elemental form is zero.

in no, the oxidation number of o is -2 so the oxidation number of n is +2 so that the sum is zero.

similarly, the oxidation number of c in co is +2 and o is -2.

on product side the oxidation number of n is 0 as it is in the elemental form() .

oxidation number of c in carbon dioxide is +4 as there are two oxygen in it and we know that each oxygen is -2.

so, oxidation number of n is changing from +2 to 0 and the oxidation number of c is changing from +2 to +4.

since nitrogen is reduced and hence no is acting as an oxidizing agent. carbon is oxidized and so co is acting as a reducing agent.

so, the right choice is number 3.)the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.

the electron configuration that you gave me has 16 electrons ergo it has 16 protons ergo it is the element sulfur.