Understanding Covalent Bonds and Structures

What type of bond involves the sharing of electrons between nonmetals?

• Ionic bond

• Covalent bond

• Hydrogen bond

• Metallic bond

What is the main reason simple molecular substances have low melting points?

• Strong covalent bonds within molecules

• Presence of free electrons

• Weak intermolecular forces between molecules

• High atomic mass

As you move down the group of halogens, what happens to the boiling points?

• They decrease

• They remain constant

• They increase

• They fluctuate randomly

Why don't simple molecular substances conduct electricity?

• They have free electrons

• They have charged particles

• They lack free electrons and charged particles

• They are always in solid form

What is a key feature of giant covalent structures?

• They conduct electricity well

• They have low melting points

• They are made of metal atoms

• They are composed of repeating lattices

Which of the following is an exception to the non-conductivity of giant covalent structures?

• Diamond

• Ammonia

• Graphite

• Silicon dioxide

What is the composition of silicon dioxide?

• Carbon and oxygen

• Silicon and oxygen

• Silicon and nitrogen

• Carbon and hydrogen

What is another name for silicon dioxide?

• Graphite

• Ammonia

• Silica

• Diamond

What is the main component of sand?

• Silicon dioxide

• Chlorine

• Graphite

• Diamond

What distinguishes giant covalent structures from simple molecular substances?

• Presence of ionic bonds

• Regular repeating lattices

• Weak covalent bonds

• Low boiling points