Urea is a product of digestion of proteins and other foods that contain nitrogen. It can react with water
and acid to form ammonium ions and bicarbonate ions according to the equation below
(NH2),CO(aq) + 2H20(1)+H+ (aq) → 2NH (aq)-HCO3(aq)
The enzyme urease catalyzes this reaction. If urease is added to a solution that contains ammonia and
other nitrogen-containing compounds (but no urea), will the urease catalyze any reactions? Explain your
answer.
I
DONE

7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation. 8. when a 2.5 mol of sugar (c12h22o11) are added to a certain amount of water the boiling point is raised by 1 celsius degree. if 2.5 mol of aluminum nitrate is added to the same amount of water, by how much will the boiling point be changed? show all calculations leading to your answer or use 3 – 4 sentences to explain your answer. 9. if 5.40 kcal of heat is added to 1.00 kg of water at 100⁰c, how much steam at 100⁰c is produced? show all calculations leading to an answer. 10. the freezing of water at 0⁰c can be represented as follows: h2o (l) ↔ h2o(s) the density of liquid water is 1.00 g/cm3. the density of ice is 0.92 g/cm3. in 3 – 4 sentences explain why applying pressure causes ice to melt.