Bonding Review

As two atoms of hydrogen combine to form a molecule of hydrogen, the total energy of the two atoms

• Decreases

• Increases

• Remains the same

Answer explanation

As atoms bond to become a molecule, they become more stable and the total energy decreases.

Which is the correct electron-dot formula for a molecule of chlorine?

• 
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• 
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Based on your reference table, the atoms of which of these elements will have the strongest attraction for electrons in a chemical bond?

• N

• Na

• P

• Pt

Answer explanation

Look up electronegativity values on Table S (electronegativity = attraction for electrons)

N = 3.0

Na = 0.9

P = 2.2

Pt = 2.2

Highest EN = strongest attraction

The bonds in BaO are best described as

• Covalent, because valence electrons are shared

• Covalent, because valence electrons are transferred

• Ionic, because valence electrons are shared

• Ionic, because valence electrons are transferred

Answer explanation

Ionic Bond = M + NM

Ba is a metal and O is a nonmetal.

Ionic Bonding = Transfer of electrons

A substance conduct electricity when dissolved in water, but does not conduct electricity in the solid phase. The substance is most likely

• An ionic solid

• A network solid

• A metallic solid

• A molecular solid

Answer explanation

Ionic substances conduct electricity only in the liquid phase or in solution!!!

Which two substances are covalent compounds?

• C₆H₁₂O₆ and KI

• C₆H₁₂O₆ and HCl

• KI and NaCl

• NaCl and HCl

Answer explanation

Covalent = all nonmetals

Which molecule will have a double covalent bond?

• F₂

• O₂

• Cl₂

• N₂

What is the maximum number of covalent bonds that a carbon atom can form?

• 1

• 2

• 3

• 4

Answer explanation

Carbon’s 4 valence electrons will spread out so it can form 4 bonds

Which substance at STP conducts electricity because the substance contains mobile electrons?

• H

• He

• K

• Kr

Answer explanation

Mobile electrons = metallic bonding

K is the only metal

Which substance contains nonpolar covalent bonds?

• H₂

• H₂O

• Ca(OH)₂

• CaO

Answer explanation

SNAP (symmetry nonpolar, asymmetry polar)