NY Regents Chemistry Exam Jan 2023
Before the year 1828, it was thought that organic compounds were produced only by living organisms and that inorganic compounds were made from nonliving substances. Urea is an organic compound. In 1828, a chemist heated ammonium cyanate and produced urea, which is very soluble in water. The equation below represents this reaction.
77 Identify the element present in urea that is present in all organic compounds. 
All organic compounds must contain carbon.
78 Compare the formula mass of the two compounds in the equation. 
The two compounds in the equation have the same formula mass since they have the same formula: CN2H4O
Answer: The formula mass is the same
79 State, in terms of molecular polarity, why urea is very soluble in water. 
Water is polar. Like dissolves likes. Therefore, urea must be polar as well to dissolve in water
Answer: Urea is polar and that is while it is very soluble in water.