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In which of the following substances are intermolecular forces of attraction absent? A) HF(l) B) CCl4(l)...
Intermolecular Forces and Physical Properties of Pure Substances Which has the lowest normal boiling point? N2 CH3CH2CH3 NaCl Hg Which has the lowest normal boiling point? H2O CH4 Li2O C2H6 Which has the smallest vapour pressure at 25°C? H2O SiO2 SO2 O3 Which has the least viscosity? HOCH2CHOHCH2OH CH3(CH2)4CH3 CH3(CH2)3CH3 CH3CH2OH Which has the highest enthalpy of fusion? H2O MgO Li2O HF
Which of the following molecules is nonpolar? a. H2 b. HF c. HCl d. HI e. HBr Which of the following molecules can participate in Hydrogen bonding? a. HF b. CO2 c. CH4 d. H2S Which of the following molecules is polar? a. H2O b. CO2 c. CH4 d. N2 e. None of the above In lab, temperature changes caused by ________________ of liquids will be related to the strength of intermolecular forces. a. Evaporation b. Mass c. Density d....
Which of the following indicates the existence of strong intermolecular forces of attraction in a liquid? a very low vapor pressure a very low viscosity a very low enthalpy of vaporization Which of the following compound has the lowest normal boiling point? Which of the following pure substances has an unstably high normal baling point? CH_3OH_3 HC1 CH_3NH_2 CH_3SH CH_3CI Which of the following substance has the weakest intermolecular forces? I_2 CaO C_3H_15 SbCl_3 SiH_4 You are given the following...
Based on the predominant intermolecular forces, identify if the following should be soluble or insoluble. CCl4 and H20 A. insoluble CgH18 and C3H17C1 B. soluble CgH17Cl and H20 V HF and H20
Part A Which of the following substances will be more volatile? C6H6 CH3OH NaCl H2O a. NaCl b. H2O c. C6H6 d. C6H6 Part B Which substance has a higher melting point? C6H6 CH3OH NaCl H2O a. H2O b. NaCl c. C6H6 d. CH3OH Part C What is the intermolecular force present in I2 molecule? a. hydrogen bonds b. ionic attractions c. dipole-dipole forces d. dispersion forces
Identify the intermolecular forces present in each of these substances... HCl, He, CO, HF Match these to the correct groups below 1. Hydrogen bonding, dipole-dipole and dispersion 2. Dipole-dipole and dispersion only 3. Dispersion only
UP Determine what type of intermolecular forces are in the following molecules. a) N2 b) HCN c) CCL d) MgBr2 e) CH CI Dispersion forces only because nonpolar molecules) f) CH3CO2H 5. Which of the following substances would you expect to have a nonzero dipole moment? Explain, and show the direction of each. a) NF3 b) CH3NH2 c) XeF2 d) PCI e) XeFg f) BF;
1. Which one of the following substances has dispersion forces as its only intermolecular force? (A) CH3OH (B) NH (C) H2S (D) Brz
14. Which of the following substances will have the strongest intermolecular forces? a.H2S b, CO c.CH3OH d.HBr e.Xe
INTERMOLECULAR FORCES INTRODUCTION LEARNING OBJECTIVES To relate the effecet of intermolecular forces on relative melting points and vapour pressures of some organic substances THEORY Weak attractive forces that occur between individual molecules in substances are called intermolecular forces. These include London dispersion forces, dipole-dipole forces and hydrogen-bonding forces. Collectively, the three types of intermolecular forces are referred to as Van der Waals forces. These attractive forces are much weaker than the chemical bonds between atoms in a molecule. Note that...