The following reactions all have K < 1. 1) C6H5COO- (aq) + HCN (aq) C6H5COOH (aq) + CN- (aq) 2) NO2- (aq) + C6H5COOH (aq) HNO2 (aq) + C6H5COO- (aq) 3) HCN (aq) + NO2- (aq) CN- (aq) + HNO2 (aq) Arrange the substances based on their relative BASE strength. Clear All C6H5COO- HNO2 NO2- C6H5COOH HCN CN- strongest base intermediate base weakest base not a Bronsted-Lowry base

Which of the following signs of a chemical reaction are observed in the reaction of potassium with water? precipitate formed temperature change smell produced gas produced color change

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.

Why is the structure of molecule important to its function?