CHEM2122 WEEK 1-9
PREVIEW:
Which kinds of substances are held together by intermolecular forces? - Molecules (covalent) in solid and liquid phases Does CH4 have hydrogen bonding? - No Van der Waals forces include - Both London and dipole-dipole attractions Dipole-dipole attraction occurs when molecules are polar. Which of these molecules contains a polar bond? - HCl Does H2O have hydrogen bonding? - Yes Which is the second strongest intermolecular force, after hydrogen bonding? - Dipole-dipole attraction All molecules have London forces between them, but dipole-dipole and hydrogen bonding are so much stronger that when they are present we can ignore London forces. Which of these has ONLY London forces? - I2 A substance capable of hydrogen bonding has a _______________ boiling point than a similar substance that doesn’t hydrogen bond. - Higher Does NH3 have hydrogen bonding? - Yes London forces are stronger in heavier atoms or molecules, and weaker in lighter atoms or molecules. Which of these has the strongest London forces? - I2 Which of these molecules could have dipole-dipole attraction? - PCl3 Does NO2 have hydrogen bonding? - No Which of these molecules could have dipole-dipole attractions? - HCl (electronegativity difference = 1.1) Does HF have hydrogen bonding? - Yes Does H2S have hydrogen bonding? - No Hydrogen bonding occurs when hydrogen is bonded to N, O, or F. Which of the following has hydrogen bonding? - NH3 Which kind of intermolecular force is strongest? - Hydrogen bonding Which of the following is NOT a kind of intermolecular force? - Covalent bond Which is stronger? - Intermolecular forces Does HCl have hydrogen bonding? - No 1 20/20 Define the term “mass” - The amount of matter in an object What is the measuring unit for mass? - Grams It is an indication of the escape of molecules from the surface of the liquid. - Evaporation The following liquids are poured in a beaker: alcohol (density=0.79), corn syrup (density=1.38), water (density=1.0), and cooking oil (density= 0.93). which of theses liquids will sink to the bottom of the beaker? - Corn syrup Fluids with very low viscosity very ______________. - Fast Which unit of measurement is used for volume? - Milliliter The piece of copper has a mass of 89g and a volume of 10cm3. What would be the density of the copper? - 8.9g/cm3
0 Comments:
Post a Comment