Polar and Nonpolar Molecules and Properties

Water is polar. What does that mean?

• it is a molecule with opposite charges on opposite ends

• it is a molecule with no charge

• it is a molecule with identical charges on opposite ends

• it is a molecule with too many protons

Which characteristic of water will allow a paperclip to remain floating on water when the paperclip is gently placed on top of the water?

• adhesion

• surface tension

• solvent properties

• nonpolar

Water striders can walk across the surface of calm water. Their feet push the surface of the water down slightly, but they do not break the surface. Why?

• The insects are light enough so they do not break the hydrogen bonds holding the water molecules together

• The insects actually use their wings to hover slightly above the water’s surface and they only skim it with their feet.

• The insect’s feet are non-polar, so they are repelled by the polar water molecules and are pushed away from the water’s surface.

• The insects are small enough to see the individual water molecules, so they are able to step carefully from one molecule to the next

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molecule in which opposite ends have opposite electric charges

• cohesion

• polar molecule

• hydrogen bond

• solution

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What kind of molecule is water?

• Ionic

• Polar Covalent

• Nonpolar Covalent

• Metallic

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Which of the following can water NOT dissolve?

• Ionic Compounds

• Polar Compounds

• Nonpolar Compounds

Which of the following best describes a polar molecule?

• A molecule with a symmetrical charge distribution

• A molecule with an asymmetrical charge distribution

• A molecule with no charge

• A molecule with a net positive charge

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What is the primary reason oil and water do not mix?

• Oil is polar and water is nonpolar

• Oil is nonpolar and water is polar

• Both oil and water are polar

• Both oil and water are nonpolar

Which property of water allows it to dissolve many substances?

• Nonpolarity

• High surface tension

• Polarity

• Low density

In a polar covalent bond, electrons are:

• Shared equally between atoms

• Transferred completely from one atom to another

• Shared unequally between atoms

• Not involved in bonding