Structure of Water and Hydrogen Bonding

Capillary action, which allows water to move against gravity up a narrow tube, is primarily driven by:

• Cohesion and adhesion

• Hydrophobic interactions

• Ionic bonding

• Hydrogen bonding

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SYI-1A

Topic-1.1

In a water molecule, oxygen has a:

• Slight positive charge

• Slight negative charge

• Neutral charge

• Strong positive charge

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SYI-1A

Topic-1.1

What property of water allows it to act as a solvent for many biochemical reactions?

• High viscosity

• Low surface tension

• High heat capacity

• Polarity and ability to form hydrogen bonds

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SYI-1A

Topic-1.1

Which of the following characteristics of water is not a result of hydrogen bonding?

• adhesive strength

• capillarity

• cohesive strength

• All of the above are a result of hydrogen bonding.

Attractions between water molecules are called

• Covalent bonds

• Ionic bonds

• Polar bonds

• Hydrogen bonds

Small insects can walk across the surface of calm water. Their feet push the surface of the water down slightly, somewhat like a person walking across a trampoline, but they do not break the surface. What is the best explanation for why this happens?

• The insects are light enough so that 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 insects' 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

A florist places a bouquet of white carnations in water containing blue dye. After a time, the flowers turn blue. What process helped the carnations to change color?

• Specific heat 

• Surface tension

• Cohesion and adhesion of water molecules 

• Formation of covalent bonds between hydrogen and oxygen molecules

Many fish and aquatic plants can survive a cold winter because the layer of ice that forms at the top of the lake insulates the water below and prevents the lake from freezing solid. What unique property of water contributes to this effect?

• Water absorbs heat when it evaporates and forms a gas

• Water expands and becomes less dense when it freezes.

• Water molecules completely separate into ions in solutions.

• Water forms hydrogen bonds with ions and other polar substances.

What is the molecular geometry of a water molecule?

• Linear

• Bent

• Tetrahedral

• Trigonal Planar

Which type of bond is primarily responsible for the high boiling point of water?

• Ionic bond

• Covalent bond

• Hydrogen bond

• Van der Waals forces

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NGSS.MS-PS1-1