Water As A Solvent And Hard Water Notes Quiz

10 Questions | Total Attempts: 125

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Water As A Solvent And Hard Water Notes Quiz

Water as a Solvent and Hard Water Notes Quiz


Questions and Answers
  • 1. 
    Water is a universal solvent because:
    • A. 

      Water is polar and can dissolve more substances than any other liquid

    • B. 

      Solutes are not polar molecules

    • C. 

      Water is made up hydrogen and oxygen atoms

    • D. 

      Water has a neutral pH

  • 2. 
    Calcium, Ca2+  and Magnesium, Mg2+  are ionically charged how does this help explain why these dissolved minerals make water ‘hard’?
    • A. 

      Hard water contains Calcium, Ca2+ and Magnesium, Mg2+cations. These ions form insoluble salt (dissolved mineral) deposits. The charge of these ionic minerals make it 'hard' for water to dissolve solutes such as soap.

    • B. 

      Hard water contains Calcium, Ca2+ and Magnesium, Mg2+ anions. These ions form soluble salt (dissolved mineral) deposits. The charge of these ionic minerals make water 'hard' and help to dissolve other solutes.

    • C. 

      Hard water contains Calcium, Ca2+ and Magnesium, Mg2+ cations. Ions are insoluble salts. Ionic minerals make water 'hard' and help to dissolve other solutes.

    • D. 

      Hard water contains Sodium, Na2+ and Chlorine, Cl2+ cations. Ions are insoluble salts. Ionic minerals make water 'hard' to dissolve other solutes.

  • 3. 
    What property of water makes it vulnerable to pollution?
    • A. 

      Universal solvent

    • B. 

      Polarity

    • C. 

      Surface Tension

    • D. 

      Capillary Action

  • 4. 
    Water as a universal solvent:  Identify which group of substances are all soluble:
    • A. 

      Ammonia, salt, dishwashing liquid, sugar, vinegar.

    • B. 

      Vinegar, salt, sugar, glue, dishwashing liquid.

    • C. 

      Vinegar, salt, sugar, hand lotion, dishwashing liquid.

    • D. 

      Vinegar,salt, dishwashing liquid, vaseline, sugar.

  • 5. 
    How does flour behave when mixed into water?
    • A. 

      Flour suspends in water, eventually settling out.

    • B. 

      Flour ionically bonds with water because of its crystalline structure.

    • C. 

      Flour ionically bonds with water because of its molecular structure.

    • D. 

      Flour bonds with water because of its powdery structure.

  • 6. 
    Some hard water is naturally softened___________
    • A. 

      Some hard water is naturally softened as it passes through and reacts with rock formations that contain certain minerals. These minerals remove the calcium and magnesium from the water, making it soft.

    • B. 

      Some hard water is naturally softened as it passes through and reacts with salt water. The salt removes the calcium and magnesium from the water, making it soft.

    • C. 

      Some hard water is naturally softened as it passes through other elements. These elements ionically bond with the calcium and magnesium from the water, making it soft.

    • D. 

      Some hard water is naturally softened as it passes through aquifers that contain fresh water. The fresh water removes the calcium and magnesium from the water, making it soft.

  • 7. 
    Hard water is made up of Calcium Ca2+ and Magnesium Mg2+.  These hard water __________ are __________charged ions.
    • A. 

      Hard water is made up of Calcium Ca2+ and Magnesium Mg2+. These hard water cations are positively charged ions.

    • B. 

      Hard water is made up of Calcium Ca2+ and Magnesium Mg2+. These hard water anions are negatively charged ions.

    • C. 

      Hard water is made up of Calcium Ca2+ and Magnesium Mg2+. These hard water anions are positively charged ions.

    • D. 

      Hard water is made up of Calcium Ca2+ and Magnesium Mg2+. These hard water cations are negatively charged ions.

  • 8. 
    How do water softeners begin to soften hard water?
    • A. 

      Water softeners work as the high calcium/magnesium water enters the softener into a tank where it interacts with a specially prepared bead that is saturated with sodium ions. The hardness minerals in the hard water attach themselves to the sodium ion beads and are "exchanged" for the sodium. This exchange removes the calcium/magnesium from the water replacing those ions with sodium ions.

    • B. 

      Water softeners work as the high sodium/magnesium water enters the softener into a tank where it interacts with a specially prepared bead that is saturated with calcium ions. The hardness minerals in the hard water attach themselves to the sodium ion beads and are "exchanged" for the calcium. This exchange removes the sodium/magnesium from the water replacing those ions with calcium ions.

    • C. 

      Water softeners work as the high calcium/sodium water enters the softener into a tank where it interacts with a specially prepared bead that is saturated with magnesium ions. The hardness minerals in the hard water attach themselves to the magnesium ion beads and are "exchanged" for the magnesium. This exchange removes the calcium/sodium from the water replacing those ions with magnesium ions.

    • D. 

      Water softeners work as the highly ionized water enters the softener into a tank where it interacts with a specially prepared bead that is saturated with hydrogen ions. The hardness minerals in the hard water attach themselves to the hydrogen ion beads and are "exchanged" for the hydrogen. This exchange removes the ions from the water replacing those ions with hydrogen ions.

  • 9. 
    Hard water contains large amounts of dissolved minerals, metals, and ions in the form of carbonates. The simplest way to determine if water is hard or soft is the __________ test. This test shows whether _________ or  __________ will ____________ when agitated.
    • A. 

      Hard water contains large amounts of dissolved minerals, metals, and ions in the form of carbonates. The simplest way to determine if water is hard or soft is the lather test. This test shows whether toothpaste or soap will lather up when agitated.

    • B. 

      Hard water contains large amounts of dissolved minerals, metals, and ions in the form of carbonates. The simplest way to determine if water is hard or soft is the smoothness test. This test shows whether toothpaste or shampoo will stick on to brushes when agitated.

    • C. 

      Hard water contains large amounts of dissolved elements, metals, and ions in the form of carbonates. The simplest way to determine if water is hard or soft is the stickiness test. This test shows whether dishwashing liquid or dishwashing powder will stick to dishes when agitated

    • D. 

      Hard water contains large amounts of dissolved minerals, metals, and ions in the form of carbonates. The simplest way to determine if water is hard or soft is the taste test. This test shows whether swishing or gargling hard water will taste bitter when agitated.

  • 10. 
    The electrical attraction between sodium ions (Na+) and chloride ions (Cl-) produces a ___________ arrangement.
    • A. 

      ​The electrical attraction between sodium ions (Na+) and chloride ions (Cl-) produces a crystalline arrangement.

    • B. 

      ​The electrical attraction between sodium ions (Na+) and chloride ions (Cl-) produces a hexagonal arrangement.

    • C. 

      ​The electrical attraction between sodium ions (Na+) and chloride ions (Cl-) produces a quadrilateral arrangement.

    • D. 

      ​The electrical attraction between sodium ions (Na+) and chloride ions (Cl-) produces a three cube arrangement.

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