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BIOS 100 Test 2
- Because of the polar nature of water, it is a universal
- solute.
- suspension.
- solvent.
- solution.
E. salt.:
Answer C. Solvent
- What makes ice less dense than liquid water?
- Hydrogen bonds between water molecules expand when solid.
- Nuclear forces form expansive crystals as freezing occurs.
- Hydrogen donates electrons to oxygen as freezing occurs.
- Covalent bonds within water molecules expand when solid.
E. Ionic bonds between water molecules expand when solid.:
Answer С.Hydrogen bonds between water molecules expand when solid
- How does water dissolve table salt?
- Water is a polar molecule that takes electrons from sodium chloride.
- Water is a polar molecule that disrupts hydrogen bonds between sodium and chloride.
- Water is a nonpolar molecule that breaks the ionic bonds between sodium and chloride.
- Water is a polar molecule that disrupts ionic bonds between sodium and chloride.
- Water is a nonpolar molecule that dissolves covalent bonds between sodi- um and
chloride.:
Answer D. Water is a polar molecule that disrupts ionic bonds between sodium and chloride.
- The surface tension of water is an example of
- capillary action.
- covalent bonding.
- adhesion.
- cohesion. 1 / 3
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E. strong hydrogen bonds.:
Answer D. cohesion.
- How does the molecular structure of a water molecule affect its polarity?
- The oxygen takes an electron from each hydrogen, yielding a negatively charged oxygen
- The oxygen and hydrogen rapidly exchange electrons in their outermost energy shells,
- The oxygen has a partial positive charge and the hydrogens have a partial negative charge,
- The oxygen donates an electron to each hydrogen, yielding a positively charged oxygen
- The oxygen has a partial negative charge and the hydrogens have a partial positive charge,
and two positively charged hydrogens that can form hydro- gen bonds.
producing structures that can form hydrogen bonds.
yielding a weakly polar water molecule that can form hydro- gen bonds.
and two negatively charged hydrogens that can form hydro- gen bonds.
yielding a weakly polar water molecule that can form hy- drogen bonds.:
Answer Е.The oxygen has a partial negative charge and the hydrogens have a partial positive charge, yielding a weakly polar water molecule that can form hydrogen bonds.
- What makes ice less dense than liquid water?
- Hydrogen bonds between water molecules expand when solid.
- Covalent bonds within water molecules expand when solid.
- Hydrogen donates electrons to oxygen as freezing occurs.
- Nuclear forces form expansive crystals as freezing occurs.
E. Ionic bonds between water molecules expand when solid.:
Answer С.Hydrogen bonds between water molecules expand when solid.
- The of water molecules explains how some insects can walk on water.
- adhesion
- solubility
- movement
- aversion
E. cohesion:
Answer Е.Cohesion
- In a water molecule, hydrogen atoms are bonded to oxygen by 2 / 3
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bonds, whereas neighboring water molecules are held together by bonds.
- polar covalent; hydrogen
- hydrogen; polar covalent
- polar covalent; ionic
- ionic; polar covalent
E. ionic; hydrogen:
Answer А.polar covalent; hydrogen
- The "stickiness" of water results from the bonding of
water molecules.
- covalent
- hydrophobic
- acidic
- hydrogen
E. ionic:
Answer D. hydrogen
- Olive oil is because .
- both hydrophilic and hydrophobic; it interacts with water and oil
- hydrophobic; it does not interact with water
- hydrophobic; it interacts with water
- hydrophilic; it does not interact with water
E. hydrophilic; it interacts with water:
Answer B. hydrophobic; it does not interact with water
- Which of the following is NOT a property of water?
- Water is liquid at 4°C.
- Due to unequal sharing of electrons, water molecules are polar.
- All biological molecules will dissolve in water.
- Water molecules adhere to charged surfaces.
E. Water molecules are cohesive to other water molecules.:
Answer C. All biological molecules will dissolve in water.
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