Chapter 3 The Chemistry of Water

Chapter(3):The chemistry of water 1) The specific heat of water is : A.5 Cal per g per C B.2 Cal per g per C C.3 Cal per g per C D.1 Cal per g per C 2) The specific heat of water is A.High B.Low C.Moderate D.None of above 3) The sphere of water molecule around an ions is known as A.Hydration shell B.Cohesion C.Adhesion D.Surface tension 4) Each water molecules can form hydrogen bond with other ———molecules A.4 B.3 C.2 D.1 5) Ice floats above liquid water because A.Ice is less dense than water B.Liquid water is less dense than water C.Both of liquid water and ice have same density D.A+C E.None of the above 6) some evaporation can occur at———A.High temperature B.Low temperature C.Any temperature D.At 100C E.None of the above 7) Describe water’s heat of vaporization A.High B.Low C.Moderate D.It has none E.All of the above 8) when water vaporizes , which of the following bonds must be broken A.Ionic B.Polar covalent C.Hydrogen bond D.Hydrophobic E.None of the above 9) which the following is not property of liquid water A.Ice has a lower density than liquid water B.Liquid water has high surface tension C.Can form hydrogen bond with other water molecules D.Has low specific heat E.None of the above 10) Most important reason for unusual properties of water is A.The covalent bonding pattern-in water molecules B.The bond angle between two hydrogen atoms in the molecule C.Hydrogen bonding between water molecules D.None of the above E.All of the above 11) The property that can make water resistant to changing in its temperature A.High surface tension B.High specific heat C.High heat of evaporation D.Its V shape E.Covalent bond between water molecules 12) In aqueous solution , the solvent is ——A.Water chloroform B.Ether C.All of the above D.None of the above 13) which of the following classified as hydrophilic molecules but cannot dissolve in water A.Cellulose B.Cotton C.Oil D.Salt E.A+ B 14) Which of the following helps in the transporting of water against gravity A.Cohesion B.Adhesion C.Evaporation D.Condensation E.All of them except D 15) Hydration shell can be form around A.Ion B.Sugar C.Oil D.Glucose E.All of them except C 16) which of the following is true about electronegativity of oxygen and hydrogen A.Hydrogen is more electronegative than oxygen B.Oxygen is more electronegative than hydrogen C.Oxygen and hydrogen have the same electro negativity 17) which the following is hydrophobic material A.Paper B.Salt C.Wax D.Sugar E.Pasta 18) Transformation of material from liquid to gaseous state is known as A.Evaporation B.Vaporization C.Boiling D.Condensation E.A+B 19) The tendency of water molecules to stay close to each other as a result hydrogen bonding A.Acts to moderate temperature B.Keeps water moving through the vessels in tree trunk C.Is called cohesion D.Provide the surface tension that allows leaves to float on water E.All of the listed responses are correct 20) The oxygen atom in a water molecule due to its high electronegativity A.One negative charge B.Two negative charges C.One positive charge D.Two positive charges E.None of the above 21) Hydrogen bond is Attraction between hydrogen and electronegative atom 22) What is specific heat A.The temperature it takes to raise 1g of a substance by 1 degree C B.The temperature it takes to raise 1g of a substance by 1 degree F C.The temperature in Celsius to boil 1g of substance at boiling point 23) Based on your knowledge of the polarity of water molecules, the solute molecules depicted here is most likely. A.Positively charged B.Negatively charged C.Whiteout charged D.None polar 24) According to the figure A represent ———- bond while B represent ———bond 25 ) According to the figure which letters represent adhesion and which represent cohesion? 26)When water vaporizes, which of the following bonds is broken A. B. C. D. Ionic Hydrogen Polar covalent Non polar covalent Answers 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. D) 1 cal per g per C A)High A)Hydration shell A)4 A)Ice is less dense than water C)At any temperature A)High C)Hydrogen bond D)Has low specific heat C)Hydrogen bonding between water molecules B)High specific heat A)Water E)B+ A E)All of them except D E)All of them except C B)Oxygen is more electronegative than hydrogen C)Wax E)A+B E)All of the listed responses are correct B)Two negative charges Answered A.The temperature it takes to raise 1g of a substance by 1 degree C Positively charged A)polar. B)hydrogen bond A) Adhesion. B)Cohesion B)Hydrogen bonds **