Answers 25-26 KCS18 Chemistry ICTypes of Chemical Bonds

Covalent Bonding Answers

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Which type of bond will form between two chlorine atoms?

an ionic bond

a metallic bond

a polar covalent bond

a nonpolar covalent bond

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Some atoms are exceptions to the octet rule by having an expanded octet. Which characteristic is needed for an atom to have an expanded octet?

The atom has empty d-orbitals.

The atom has more than eight valence electrons before bonding.

The atom has empty p-orbitals.

The atom has fewer than eight valence electrons after bonding.

Which element has the greatest number of valence electrons available for bonding?

selenium

boron

calcium

chlorine

Which compound is an exception to the octet rule?

H2O

HCl

CCl4

ClF3

How many valence electrons are available for bonding in silicon?

four

five

eight

fourteen

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 pair of elements will form a covalent bond?

hydrogen and chlorine

sodium and chlorine

copper and bromine

zinc and bromine

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

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.

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

one

two

five

seven

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Covalent Bonding Answers

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