Answers Chemistry - SC3210 A-CRCovalent Bonding

Lab: Ionic and Covalent Bonds Answers

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Which type of bond will most likely be found in HBr given that the electronegativity of hydrogen is 2.20 and the electronegativity of bromine is 2.96?

an ionic bond

a metallic bond

a polar covalent bond

a nonpolar covalent bond

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Which structure shows the correct electron arrangement in CCl4?

A central upper C is single bonded to upper H above, below, and to the left, and single-bonded to upper C l to the right. The C l has three pairs of electron dots, above, right, and below.

A central upper C is single bonded to upper C l to the top, bottom, and left; those upper C l atoms have three pairs of electron dots on the sides away from the bond. The C is also single bonded to an upper H to the right.

A central upper C is single bonded to upper H above and below, and to upper C l to the left and right. The C l have three pairs of dots, above, below, and to the side opposite the bond.

A central upper C is single bonded to upper C l above, right, left, and below. All the C l atoms have 3 pair of electron dots, on the three sides that do not have the bond.

Which compound is an exception to the octet rule?

H2O

HCl

CCl4

ClF3

Which characteristic best explains the difference in melting behavior of covalent substances and ionic substances?

Ionic substances have weaker intermolecular attractions.

Ionic substances usually have stronger atomic bonds.

Covalent substances have weaker intermolecular attractions.

Covalent substances usually have stronger atomic bonds.

Which compound contains only a nonpolar covalent molecule?

HCl

H2O

NO3

Which element has the fewest valence electrons available for bonding?

iodine

aluminum

carbon

nitrogen

How many valence electrons are available for bonding in bromine (Br)?

one

two

five

seven

A solid compound in a sealed container was kept at a very low temperature in a freezer. When placed at room temperature, the substance quickly turned into a liquid. This compound is most likely which of the following?

an ionic compound because it has a low boiling point

a covalent compound because it has a low boiling point

an ionic compound because it has a low melting point

a covalent compound because it has a low melting point

What is the best reason for the difference in properties of LiCl and C6H14O?

LiCl and C6H14O have different atomic masses.

Cl and O belong to different groups of the periodic table.

One compound is ionic, and the other is metallic.

One compound is covalent, and the other is ionic.

Which pair of elements will form a covalent bond?

hydrogen and chlorine

sodium and chlorine

copper and bromine

zinc and bromine

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Lab: Ionic and Covalent Bonds Answers

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