4 points A solution consists of 2.50 moles of NaCl dissolved in
100. grams of H20 at 25°C. Compared to the boiling
point and freezing point of 100. grams of H20 at
standard pressure, the solution at standard pressure
has
A) a lower boiling point and a higher freezing point
B) a higher boiling point and a lower freezing point
C) a higher boiling point and a higher freezing point
D) a lower boiling point and a lower freezing point

hey your not cool]      

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

so what is the problem with your lab report and whats the subject of the lab report? i will you

a electronegativity decreases beacuse the size of nucleus is bigger.