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1 Name Practice IMFs and VP Date Which formula represents a nonpolar molecule containing polar covalent bonds? A) NH3 B) H2 C) CCl4 D) H2O 408. In substances that sublime, the forces of attraction are A) strong and the vapor pressure is high B) weak and the vapor pressure is high C) weak and the vapor pressure is low D) strong and the vapor pressure is low Which graph best represents the variation in the vapor pressure of water as temperature changes? A) B) C) D) Which of these formulas contains the most polar bond? A) H I B) H Br C) H Cl D) H F 293. Which sample of water has the greatest vapor pressure? A) 100 ml at 20ºC B) 200 ml at 25ºC C) 20 ml at 30ºC D) 40 ml at 35ºC 352. What is the vapor pressure of water at 105ºC? A) kpa B) 145 kpa C).60 kpa D) 120 kpa Which of these substances has the strongest forces? A) H2Te B) H2Se C) H2O D) H2S
2 1714. The chart below shows the change in vapor pressure of four pure liquids with increasing temperature. Which liquid has the lowest normal boiling point? A) A B) B C) C D) D What is the vapor pressure of a liquid at its normal boiling temperature? A) 1 kpa B) kpa C) 273 kpa D) 760 kpa Molecules in a sample of NH3( ) are held closely together by forces A) caused by unequal charge distribution B) existing between ions C) existing between electrons D) caused by different numbers of neutrons The boiling point of a liquid is the temperature at which the vapor pressure of the liquid is equal to the pressure on the surface of the liquid. What is the boiling point of propanone if the pressure on its surface is 48 kilopascals? A) 25 C B) 35 C C) 30. C D) 40. C Hexane (C6H14) and water do not form a solution. Which statement explains this phenomenon? A) Hexane is ionic and water is polar. B) Hexane is nonpolar and water is polar. C) Hexane is nonpolar and water is ionic. D) Hexane is polar and water is nonpolar Which compound has molecules that form the strongest hydrogen bonds? A) HCl B) HBr C) HI D) HF
3 5949. Which statement explains why low temperature and high pressure are required to liquefy chlorine gas? A) Chlorine molecules have strong covalent bonds. B) Chlorine molecules have weak forces of attraction. C) Chlorine molecules have strong forces of attraction. D) Chlorine molecules have weak covalent bonds In aqueous solution, a chloride ion is attracted to which end of the water molecule? A) the hydrogen end, which is the negative pole B) the oxygen end, which is the positive pole C) the hydrogen end, which is the positive pole D) the oxygen end, which is the negative pole At STP, fluorine is a gas and iodine is a solid. This observation can be explained by the fact that fluorine has A) weaker forces of attraction than iodine B) higher average kinetic energy than iodine C) stronger forces of attraction than iodine D) lower average kinetic energy than iodine What is the vapor pressure of water when it is boiling at 30.0ºC? A) kpa B) 5 kpa C).2 kpa D) 45 kpa Base your answers to the following questions on the information given below. Testing of an unknown solid shows that it has the properties listed below. (1) low melting point (2) nearly insoluble in water (3) electricity (4) relatively soft solid a State the type of bonding that would be expected in the particles of this substance.] b Explain in terms of attractions between particles why the unknown solid has a low melting point. c Explain why the particles of this substance are poor conductors of electricity.
4 5060. Base your answer to the following question on the information below. Each molecule listed below is formed by sharing electrons between atoms when the atoms within the molecule are bonded together. Molecule A: Cl2 Molecule B: CCl4 Molecule C: NH3 Explain why NH3 has stronger forces of attraction than Cl2. Base your answers to the next 2 questions on the table below Explain, in terms of forces, why hydrogen has a lower boiling point than hydrogen bromide Explain, in terms of molecular polarity, why hydrogen chloride is more soluble than hydrogen in water under the same conditions of temperature and pressure A liquid boils when the vapor pressure of the liquid equals the atmospheric pressure on the surface of the liquid. Using Reference Table H, determine the boiling point of water when the atmospheric pressure is 90. kpa.
5 Answer Key IMF Practice C 408. B A D 293. D 352. D C A B A B B D B C A B a covalent or molecular or nonpolar covalent b Examples: -The attractions between the particles of the solid are weak. -Weak attractions. c Example: -There are no freely moving charged particles Examples: NH3 has polar molecules that attract each other. NH3 has an unshared pair of electrons around the center atom. NH3 is capable of hydrogen bonding. unequal distribution of electrons in strong attraction Examples: Hydrogen has weaker forces than HBr. hydrogen weaker forces Examples: HCl's molecular polarity is more similar to water's polarity than H2's polarity compared to water's HCl and water both polar, H2 nonpolar, like dissolves like HCl polarity is more similar to water's polarity C ± 1 C.
Which substance is an ionic compound? A) A B) B C) C D) D
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