Question

QUESTION 2 A H-atom bonded to O atom (such as in water) can also form an intermolecular bond with which of the following atom(s): Select all that apply A. C B. N C. O D. F

The boiling points of hydrides of group-6 is shown below. The general trend of increasing boiling point with increasing molecular weight can be observed for H2S, H2Se and H2Te. The boiling point of H2O is unusually high and is 100 Celsius, The reason for this high boiling point of water can be attributed to? Compound Boiling point in Celsius H2O 100 H2S -60.7 H2Se -41.5 H2Te -2.2 A. H2O can make strong van der Waals bonds with the neighboring molecules B. H2O can make strong London forces with the neighboring molecules C. H2O can make hydrogen bonds with neighboring molecules D. None of the above

QUESTION 4 Molality ("m") is defined as moles of a substance / mass of the solvent in kilograms (Kg) Molality = moles of substance / mass of solvent in Kg. If 1.0 mole of NaCl is dissolved in 500 mL of water (density of water = 1.0 g / mL), what is the molality of this solution Hint: you must convert the volume of water into Kg of water. 1000 g = 1.0 Kg A. 2.0 m B. 2X10-3 m C. 0.5 m D. 1.0 m 1

QUESTION 5 Which of the following(s) is/are colligative properties of the solvent? Select all that apply: A. Boiling point elevation B. Freezing point depression C. Osmotic pressure D. Vapor pressure

QUESTION 6 The step-7 in lab procedure, you need to add NaCl into ice in 500 mL beaker. The purpose of this step is A. create a system that is exposed to 1 atm pressure B. to make sure the mass of water/ice solution in 500 mL beaker stays constant through the experiment C. to lower the temperature of the ice-water mixture in 500 mL beaker closer to -10 Celsius D. None of the above