Simple and giant covalent structures

What type of structure is diamond, graphite and silicon dioxide?

• Giant ionic

• Giant covalent

• Simple molecule

• Giant metallic

• Monatomic

Why is graphite so soft?

• A.  The atoms are arranged in hexagons in layers that are held together strongly
• B.  The atoms are arranged in hexagons in layers that are held together weakly and so can slide

• C.  Carbon is strongly bonded to 3 other carbon atoms.
• D.  Carbon is weakly bonded to 3 other carbon atoms.

What property of diamond is an effect of LOTS of energy being required to break the many covalent bonds?

• Refractive index
• Brilliance
• Transparency
• Conductivity
• High Melting point

What element are diamond and graphite made up of?

• A.     Sodium
• B.     Carbon
• C.     Carbon dioxide
• D.     Silicon

A substance has high melting and boiling points, is very strong and doesn’t conduct electricity in any state. What kind of bonding is it likely to consist of?

• Giant ionic

• Giant covalent

• Giant metallic

• Simple covalent

What two types of atoms make a covalent bond?

• 2 Nonmetals
• 1 Nonmetal and 1 Metal
• 2 Metals
• 2 Noble Gases

What type of compound consists of molecules that made of atoms that are covalently bonded?

• ionic
• crystal
• noncovalent
• simple molecular

Which of the following is a characteristic property of simple molecular compounds?

• low melting points
• high melting points
• high boiling points
• high electric conductivity

When two atoms share electrons, a chemical bond is formed.  This type of bond is called:

• covalent bond
• ionic bond
• crystal bond
• polyatomic bond

How are covalent bonds explained?

• When one atom takes the other atom's electron
• When the atom shares an electron with an another atom
• When the two nucleus merge
• When the neutrons leave the nucleus