Giant Covalent Network Solids

Which of the following statements concerning the

substances with a giant covalent structure are correct?

(1) They have high melting points.

(2) They can conduct electricity when molten.

(3) They are insoluble in water but soluble in non-aqueous solvents.

• (1) only

• (2) only

• (1) and (3) only

• (2) and (3) only

Silicon and carbon react to form silicon carbide. The crystal structure of silicon carbide is similar to that of diamond. Silicon carbide is very hard because

• it has a high melting point.

• silicon atoms and carbon atoms form triple bonds.

• it has a giant network structure with strong covalent bonds.

• both silicon and carbon atoms have four outermost shell electrons.

Tags

NGSS.HS-PS1-1

Covalent bonding is between a

• nonmetal and nonmetal

• metal and nonmetal

• metal and metal

• It depends on the situation

Tags

NGSS.HS-PS1-2

Which bond does this picture best represent?

• Metallic bond

• ionic bond

• covalent bond

• James Bond

Which of the following is a giant covalent network solid?

• AgCl

• I₂

• SiO₂

• Fe (s)

Which of the following solids conduct electricity?

• MgI₂

• Br₂

• Graphite

• Diamond

• Cu metal

What makes diamond and graphite different?

• one starts with a "G"

• diamond is made up of more than just carbon

• diamond is 3D and graphite is 2D layers of carbon atoms

• i couldn't think of a fourth one

Why are graphite and metallic solids similar?

• Both have delocalised electrons that can carry charge

• Both include metal atoms

• They are both hard solids

• Both have weak covalent bonds that can be overcome by the attractions to water

Graphite is a soft solid. What does "soft" mean?

• Easily broken, crumbly

• inflexible

• Able to be twisted into wires

• Will dissolve in water