Take Another Quiz

Water And Aqueous Systems Chapter 15 Chemistry

52 Questions
Chemistry Quizzes & Trivia

WATER AND AQUEOUS SYSTEMS &nbs p; chapter 15 Chemistry

Questions and Answers
  • 1. 
    What unique molecular compound is the foundation of all life on Earth? 
    • A. 

      Solid

    • B. 

      Ice

    • C. 

      Water

  • 2. 
    Approximately what fraction of Earth's surface is covered in water?       
    • A. 

      1/3

    • B. 

      3/4

    • C. 

      1/2

  • 3. 
    ln a _________________, the less electronegative hydrogen atoms acquire a slight positive charge and the oxygen atom acquires a slight negative charge.
    • A. 

      Hydrogen molecule

    • B. 

      Water molecule

    • C. 

      Oxygen molecule

  • 4. 
    A. High surface tension     B.low vapor pressure   C.high specific heat capacity   D.high heat of vaporization  E. high boiling point 
    • A. 

      Five important properties of water that result from hydrogen bonding.

    • B. 

      Five important properties of hydrogen that result from water bonding.

    • C. 

      Five important properties of oxygen that result from hydrogen bonding.

  • 5. 
    Because the ______________ has an H — O — H bond angle of 105°, the molecule as a whole is polar.  
    • A. 

      Water molecule

    • B. 

      Oxygen molecule

    • C. 

      Hydrogen molecule

  • 6. 
    In a full glass of water, the water surface seems to bulge over the rim of the glass. Water forms nearly spherical drops at the end of an eyedropper.           An insect called a water strider is able to "walk" on water.
    • A. 

      Those sentences describe how detergent molecules strengthen hydrogen bonding between water molecules.

    • B. 

      Those sentences describes how water beads up into small, nearly spherical drops on a paper towel.

    • C. 

      Those sentences describes results of the surface tension of water.

  • 7. 
    Why does a water drop have surface tension?
    • A. 

      Because air molecules at the surface cannot form hydrogen bonds with water molecules, molecules on the surface are drawn into the body of liquid. The inward pull on the molecules is surface tension.

    • B. 

      Because hydrogen molecules at the surface cannot form water bonds with air molecules, molecules on the surface are drawn into the body of liquid. The inward pull on the molecules is surface tension.

    • C. 

      Because water molecules at the surface cannot form hydrogen bonds with air molecules, molecules on the surface are drawn into the body of liquid. The inward pull on the molecules is surface tension.

  • 8. 
    What geometric shape has the smallest surface area for a given volume? 
    • A. 

      A sphere

    • B. 

      A cone

    • C. 

      A circle

  • 9. 
    Detergent molecules interfere with hydrogen bonding between water molecules. Detergents act as "wetting agents." When detergents reduce surface tension, beads of water collapse and the water spreads out.
    • A. 

      This correctly describes a property of water molecules.

    • B. 

      This correctly describes a property of detergents.

    • C. 

      This correctly describes a property of hydrogen bonding.

  • 10. 
    Do liquids that have higher surface tension produce drops that are flatter or more nearly spherical than liquids with lower surface tension?
    • A. 

      Liquids with higher surface tension produce drops that are greatly spherical.

    • B. 

      Liquids with higher surface tension produce drops that are more nearly spherical.

    • C. 

      Liquids with higher surface tension produce drops that are less nearly spherical.

  • 11. 
    What is the name for an agent, such as a detergent, that has the ability to reduce surface tension?
    • A. 

      Condensation

    • B. 

      Vaporize

    • C. 

      Surfactant

  • 12. 
    The high specific heat capacity of water is due to_____________ bonding.
    • A. 

      hydrogen

    • B. 

      Water

    • C. 

      Oxygen

  • 13. 
    Is the following sentence maybe, true or false? Iron requires nearly 10 times more heat than an equal mass of liquid water to produce the same temperature increase.
    • A. 

      True

    • B. 

      False

    • C. 

      Maybe

  • 14. 
    What effect does a large body of water have on the daily temperature of the air around it?
    • A. 

      It moderates the temperature by keeping it cooler during the day and warmer at night.

    • B. 

      It moderates the temperature by keeping it warmer during the day and cooler at night.

    • C. 

      It moderates the temperature by keeping it cooler during the day and cooler at night.

  • 15. 
    Is the following sentence sometimes, true or false? Because of hydrogen bonding, water absorbs a large amount of heat as it evaporates or vaporizes.
    • A. 

      Sometimes

    • B. 

      True

    • C. 

      False

  • 16. 
    The amount of heat given off during the condensation of one gram of water is the same as the amount of heat absorbed by one gram of water when it vaporizes.                                    An extensive network of hydrogen bonds tightly holds the molecules in liquid water together.
    • A. 

      True about vaporization or condensation of hydrogen.

    • B. 

      True about vaporization or condensation of oxegen.

    • C. 

      True about vaporization or condensation of water.

  • 17. 
    How are the evaporation and condensation of water important to regional temperatures on Earth? 
    • A. 

      Temperatures in tne tropics would be much lower if water did not absorb heat while evaporating from the surfaces of surrounding oceans. Temperatures in polar regions would be much higher if water did not release heat while condensing out of air.

    • B. 

      Temperatures in tne tropics would be much higher if water did not absorb heat while evaporating from the surfaces of surrounding oceans. Temperatures in polar regions would be much lower if water did not release heat while condensing out of air.

    • C. 

      Temperatures in tne tropics would be much higher if water absorbs heat while evaporating from the surfaces of surrounding oceans. Temperatures in polar regions would be much lower if water did not release cool while condensing out of air.

  • 18. 
    What is unusual about the boiling point of water? How can this difference be explained? 
    • A. 

      ? Water has a boiling point that is substantially higher than the other compounds. Because of hydrogen bonding in water, more heat is needed to disrupt attractions between hydrogen molecules.

    • B. 

      Water has a boiling point that is substantially higher than the other compounds. Because of hydrogen bonding in water, more heat is needed to disrupt attractions between water molecules.

    • C. 

      Water has a boiling point that is substantially lower than the other compounds. Because of oxygen bonding in water, more heat is needed to disrupt attractions between water molecules.

  • 19. 
    What happens to the density of most substances as they cool and solidify?
    • A. 

      Density usually increases as a substance warms.

    • B. 

      Density usually increases as a substance cools.

    • C. 

      Density usually decreases as a substance cools.

  • 20. 
    Why is ice less dense than liquid water?
    • A. 

      When ice melts, the framework collapses, and the molecules pack closer together.

    • B. 

      When ice melts, the framework inflates, and the molecules are packed looser together.

    • C. 

      When ice melts, the framework collapses, and the molecules pack looser together.

  • 21. 
                liquid water at 4 °C
    • A. 

      1.000 g/cm3

    • B. 

      0.9998 g/cm3

    • C. 

      1 -OQO 9/cm3

  • 22. 
                liquid water at 0 °C 
    • A. 

      0.9168 g/cm3

    • B. 

      0.9998 g/cm3

    • C. 

      1 -OQO 9/cm3

  • 23. 
    ice at 0 °C
    • A. 

      0.9168 g/cm3

    • B. 

      0.9998 g/cm3

    • C. 

      0.9168 9/cm3

  • 24. 
    What is unusual about the data in Question 23? Will ice float on liquid water?
    • A. 

      The density of liquid water decreases from 4 °C to 0 °C, and ice at 0 °C is more dense than liquid water at 0 °C.No, ice will float on liquid water.

    • B. 

      The density of liquid water increases from 4 °C to 0 °C, and ice at 0 °C is less dense than liquid water at 0 °C. No, ice will float on liquid water.

    • C. 

      The density of liquid water decreases from 4 °C to 0 °C, and ice at 0 °C is less dense than liquid water at 0 °C. Yes, ice will float on liquid water.

  • 25. 
    Water samples containing dissolved substances are called 
    • A. 

      Solvent solutions

    • B. 

      Aqueous solutions

    • C. 

      Homogeneous solutions

  • 26. 
    dissolving medium
    • A. 

      Solution

    • B. 

      Solute

    • C. 

      Solvent

  • 27. 
    dissolved particles
    • A. 

      Solution

    • B. 

      Solute

    • C. 

      Solvent

  • 28. 
    . homogeneous mixture of particles in  a dissolving medium
    • A. 

      Solution

    • B. 

      Solute

    • C. 

      Solvent

  • 29. 
    Is the following sentence maybe, true or false? After sodium chloride dissolves in a container of water, the sodium chloride will eventually settle to the bottom of  the container if the solution remains undisturbed at a constant temperature.
    • A. 

      True

    • B. 

      False

    • C. 

      Maybe

  • 30. 
    Solute particles can be either ionic or molecular, and their average diameters are usually less than 1.0 nanometers. When a solution is filtered, both solute and solvent will pass through the filter paper. Ionic compounds and substances containing polar covalent molecules readily dissolve in water.
    • A. 

      False about aqueous solutions.

    • B. 

      True about aqueous solutions.

    • C. 

      More information is needed.

  • 31. 
    Is the following sentence maybe, true or false? Solvents and solutes may be gases, liquids, or solids.
    • A. 

      Maybe

    • B. 

      True

    • C. 

      False

  • 32. 
    When a solid crystal of sodium chloride is placed in water, what happens?
    • A. 

      Water molecules collide with the crystal and attract its Na+ and Cl~ ions.

    • B. 

      Oxygen molecules collide with the crystal and attract its Na+ and Cl~ ions.

    • C. 

      Ionic molecules collide with the crystal and attract its Na+ and Cl~ ions.

  • 33. 
    What process occurs when solute ions become surrounded by solvent molecules?
    • A. 

      Solution

    • B. 

      Solvation

    • C. 

      Solvent

  • 34. 
    Look at the model of solvation in Figure 17.12 on page 483. If there is enough solvent, what will eventually happen to the ionic solid depicted on the left side of the diagram?
    • A. 

      Most of the ions will become surrounded by solvent molecules as the surface disappears into the solution.

    • B. 

      Some of the ions will become surrounded by solvent molecules as the surface disappears into the solution.

    • C. 

      All of the ions will become surrounded by solvent molecules as the surface disappears into the solution.

  • 35. 
    Select the sentence that best explains why the ionic compounds barium sulfate (BaSOJ and calcium carbonate (CaCO3) are nearly insoluble in water.
    • A. 

      The attractions between the ions in the crystals of these ionic compounds are weaker than the attractions between the ions and water molecules.

    • B. 

      The attractions between the ions in the crystals of these ionic compounds are stronger than the attractions between the ions and water molecules.

    • C. 

      There is no difference in the strength of the attractions between the ions in the crystals and the attractions between the ions and water molecules.

  • 36. 
    What saying sums up the observation that, as a rule, polar solvents dissolve ionic compounds and polar molecules, but nonpolar solvents dissolve nonpolar compounds?       
    • A. 

      "oxygen molecules"

    • B. 

      "solvent molecules"

    • C. 

      "like dissolves like"

  • 37. 
    What types of compounds can carry an electric current in the molten state or in aqueous solution?
    • A. 

      Electrolytes

    • B. 

      Ions

    • C. 

      Water

  • 38. 
    Is the following sentencemaybe,  true or false? All ionic compounds are electrolytes.
    • A. 

      True

    • B. 

      Maybe

    • C. 

      False

  • 39. 
    Compounds that do not conduct an electric current in either aqueous solution or the molten state are called
    • A. 

      Ions

    • B. 

      Nonelectrolytes

    • C. 

      Electrolytes

  • 40. 
    Water in a crystal that is an integral part of the crystal structure is called 
    • A. 

      Non conductive

    • B. 

      Ice crystal

    • C. 

      Water of hydration

  • 41. 
    A compound that contains water as an integral part of its crystal structure is called
    • A. 

      A hydrate

    • B. 

      Dehydrate

    • C. 

      Conductive

  • 42. 
    What does " .5H2O" mean when included in a chemical formula?
    • A. 

      The compound contains five water molecules per formula unit.

    • B. 

      The compound contains six water molecules per formula unit.

    • C. 

      The compound contains nine water molecules per formula unit.

  • 43. 
    Crystals of copper sulfate pentahydrate always contain five molecules of water for each copper and sulfate ion pair.  Heating blue crystals of copper sulfate pentahydrate above 100 °C drives off the water of hydration, leaving a white anhydrous powder.  It is possible to regenerate copper sulfate pentahydrate by treating an hydrous copper sulfate with water.
    • A. 

      True for hydrated compounds

    • B. 

      False for hydrated compounds

    • C. 

      For pentahydrate compounds

  • 44. 
    If a hydrate has a vapor pressure greater than that of the water in the surrounding air, the hydrate will lose water to the air, or        
    • A. 

      Anhydrous

    • B. 

      Effloresce

    • C. 

      Hygroscopic

  • 45. 
    Hygroscopic substances that remove water from the air are used as drying agents called
    • A. 

      Desiccants

    • B. 

      Copper sulfate

    • C. 

      Pentahydrate

  • 46. 
    What happens to dry sodium hydroxide pellets that are exposed to normally moist air? What kind of compound exhibits this behavior?
    • A. 

      The sodium hydroxide pellets remove enough water from the air to dissolve completely and form a solution. Sodium hydroxide is an example of a deliquescent compound.

    • B. 

      The ion hydroxide pellets remove enough water from the air to dissolve completely and form a solution. Sodium hydroxide is an example of a deliquescent elements.

    • C. 

      The water hydroxide pellets remove enough water from the air to dissolve completely and form a solution. nonelectrolytes hydroxide is an example of a deliquescent compound.

  • 47. 
    Is the following sentence maybe, true or false? Heterogeneous mixtures are not true solutions.
    • A. 

      Maybe

    • B. 

      True

    • C. 

      False

  • 48. 
    Heterogeneous mixtures in which particles settle out upon standing are called
    • A. 

      Colloid

    • B. 

      Colloidal particles

    • C. 

      Suspensions

  • 49. 
     Is the following sentencemaybe, true or false? When a suspension of clay particles in water is filtered, both clay and water will pass through the filter paper.
    • A. 

      Maybe

    • B. 

      True

    • C. 

      False

  • 50. 
    Heterogeneous mixtures in which particles are of intermediate size between those of true solutions and suspensions are called
    • A. 

      Colloids

    • B. 

      Solution

    • C. 

      Suspension

  • 51. 
    The scattering of light in all directions by colloidal particles is known as the
    • A. 

      Heterogeneous mixtures

    • B. 

      Tyndall effect

    • C. 

      Aqueous systems

  • 52. 
    Oil spills cause environmental problems because the__________ oil spreads out across the water.  As it spreads, it can come into contact with plants and animals. Oil clogs pores and does other damage to the life cycle of living organisms.
    • A. 

      Solvent

    • B. 

      Insoluble

    • C. 

      Soluble

Related Topics