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.

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

the increase of protons   hope this