Chemical Bonding (Properties)

Typically, atoms gain or lose electrons to

• exchange energy.

• make ions.

• complete the Octet rule.

• balance the charges to zero.

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The formation of an ionic bond involves the

• transfer of electrons.

• sharing of neutrons.

• transfer of protons.

• sharing of electrons.

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In a compound of MgCl₂, the subscript 2 indicates that

• there are 2 magnesium ions for each ion of chlorine.

• the chloride ion is twice the size of the magnesium ion.

• there are 2 chloride ions for each magnesium ion.

• chlorine has a charge of 2.

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NGSS.MS-PS1-1

Which statement best describes the properties of sodium chloride? (Hint: identify what kind of compound it is, then think about the properties)

• Sodium chloride is a malleable solid.

• Solid sodium chloride is a good conductor of electric current.

• Sodium chloride has a low melting point.

• Liquid sodium chloride is a good conductor of electric current.

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Which of the following is a typical property of an ionic compound?

• low melting point

• poor conductor of electric current when melted

• tendency to shatter when struck

• all choices are properties of ionic compounds

The elements most likely to form more than one type of ion are the

• transition metals.

• alkali metals.

• halogens.

• alkaline earth metals.

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In the name carbon dioxide, the prefix of the second word indicates that a molecule of carbon dioxide contains

• two carbon atoms.

• two oxygen atoms.

• a polyatomic ion.

• an ionic bond.

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NGSS.MS-PS1-1

What is the basis of a metallic bond?

• the attraction between neutral metal atoms

• the neutralization of protons by electrons

• the attraction of oppositely charged ions

• the attraction of metal ions to mobile electrons

Many metals can be drawn into thin wires without breaking because

• cations are still surrounded by electrons when they shift their positions in the lattice.

• metals generally have low melting points.

• when a metal is struck with a hammer, the positions of the anions do not change.

• electrons have fixed positions in a metallic lattice.

Which statement about metals is true?

• A metal lattice is extremely rigid.

• The bonds within a metal lattice are weak.

• Electrons in a metal lattice are free to move.

• Generally, metals have a low melting point.

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NGSS.HS-PS1-3