Which two factors play a role in the cohesion of water? Multiple select question. The covalent bonds that connect water molecules The hydrogen bonds that connect water molecules Water molecules are nonpolar Water molecules are polar
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Multiple Answer Which of the following are true: A. H2O contains polar covalent bonds. B. H2O can disrupt other hydrogen bonds in aqueous solutions. C. Non-polar molecules cannot have polar covalent bonds. D. H2O has a higher boiling point than methane primarily due to the hydrogen bond formation. Usually, hydrogen bonds are weaker than covalent bonds. Multiple Answer Which of the following are true: A. Ionic interactions are weak bonds in some conditions (aqueous). B. Hydrophobic interactions are caused by attraction between two hydrophobic molecules. C. Van der Waals interactions may generate significant interactions if at a large number. D. Weak bonds may allow repeated interactions between molecules. Multiple Answer Which of the following are true about strong and weak acids/bases? A. Weak acids, even if at a higher concentration, always generate fewer hydrogen ions than strong acids. B. Strong acids are usually completely ionized in aqueous solution. C. Weak bases are usually not completely ionized in aqueous solution. D. Carbonic acid (H2CO3) is a weak acid. Ammonia (NH3) is a strong base.
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22) What kind of bonds are responsible for the attraction of water molecules to one another? A) polar covalent bond B) hydrogen bond C) nonpolar covalent bond D) hydrophobic interaction E) ionic bond 23) Why are water molecules cohesive? A) hydrogen bonds B) hydrophobic interactions C) ionic bonds D) nonpolar covalent bonds E) both A and C 24) Which of the following effects is produced by the high surface tension of water? A) Organisms can't resist temperature changes. B) Water can act as a solvent. C) The pH of water remains exactly neutral. D) A water strider or some spiders can walk across the surface of a small pond. E) Lakes don't freeze solid in winter, despite low temperatures. 25) Why does ice float in liquid water? A) The ice has a life jacket and won't sink. B) Ice always has air bubbles that keep it afloat. C) The ice is less dense than the water. D) The ice is more dense than water. E) The liquid water molecules have more kinetic energy and thus support the ice.
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