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Bonds – ionic covalent metallic

Water’s Polar

Properties

Molecular Structure and

Polarity

Thermal Expansion/Contraction and Kinetic Energy

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Row 1, Col 1

The type of bond which is formed By attraction of + and – charged

ions.

What is ionic?

1,2

This property is the reason a dropOf water forms a mound

On a table top.

What is surface tension?

1,3

A linear bond between the same typeOf atoms would be this.

What is nonpolar covalent?

1,4

Use the word thermal expansionTo explain why an engineer would put joints

In sidewalk.

(Type the question for 1,4 here.)?

2,1

This type of bond involves equally Shared valence electrons OR unequally

Shared valence electrons..

What is covalent?

2,2

This property is the reasonWater “climbs” the edges of

Very narrow tubes.

What is capillary action?

2,3

The linear bond between hydrogenAnd flourine would be this.

What is polar?

2,4

Explain what happens to a gas when heated or cooled.

A gas expands when heated and contracts when cooled due to increasing or decreasing kinetic energy of the

particles ?

3,1

This type of bond leads to electrical conductivity. Atoms are held together by a “sea”

Of electrons.

What is metallic?

3,2

Increasing the kinetic energyReduces the amount of this

Dissolved substance.

What is dissolved gases?

3,3

Each of the four carbon-hydrogenBonds in methane is polar. Why is

The whole molecule nonpolar?.

The charges are balanced because of overall symmetry of the tetrahedral structure?

3,4

If thermal expansion holds true, whyDoes solid water increase in volume

Compared to liquid?.

The water molecules spread out when in the crystal lattice – this is an exception to the rule?

4,1

If there is a greater than 2.0 differenceIn this property, the bond will be

ionic.

What is electronegativity?

4,2

Explain why an electricallyCharged balloon can bend a stream of

Water. Use the words: dipole and polar.

The negatively charged balloon is attracted to the positive dipole in polar water molecules?

4,3

The reason (in terms of structure and dipoles)Water is polar.

Water is a bent molecule and the oxygen forms a negative dipole and the hydrogens form a positive

dipole?

4,4

Explain how a thermometer worksIn terms of thermal expansion.

The liquid transfers kinetic energy to the glass and then to the alcohol which expands and thus rises up the tube?

5,1

In methane, carbon is likely to form (number and type)

Of bonds with hydrogen atoms.

What is four and polar covalent?

5,2

Would you expect to see a meniscusIf you measured nonpolar rubbing

Alcohol in a graduated cylinder? Explain.

No, since rubbing alcohol is nonpolar, polar properties such as adhesion, cohesion and capillary action would

not be present.

5,3

Give the structure and polarity of Hydrochloric acid (HCl).

What is linear and polar?

5,4

A freezer cools off a room whenopen. True or false and why?

False! Heat moves high to low so it is the room warming up the freezer?