Covalent Structures and Properties

The video tutorial by Ms. Cam explores the structure and properties of calent compounds, which are divided into molecular and giant molecular structures. Molecular calent compounds, like methane and water, form discrete molecules and are mostly liquids and gases due to weak intermolecular forces. Solubility is discussed, highlighting that non-polar molecules dissolve in non-polar solvents, while polar molecules dissolve in polar solvents. Giant calent structures, such as diamond and silicon dioxide, do not form discrete molecules and have high melting and boiling points due to strong calent bonds. They are not soluble and do not conduct electricity.

What are the two main types of covalent structures?

• Molecular Covalent and Giant Molecular

• Ionic and Metallic

• Simple and Complex

• Polar and Non-polar

Which of the following is an example of a molecular covalent compound?

• Diamond

• Silicon

• Methane

• Graphite

Why are molecular covalent compounds often found as liquids or gases?

• Because they have high melting points

• Due to strong covalent bonds

• Because they are non-polar

• Due to weak intermolecular forces

Which type of solvent would a non-polar molecule dissolve in?

• Ionic solvent

• Non-polar solvent

• Polar solvent

• Metallic solvent

What allows ethanol to dissolve in water?

• Its ability to form hydrogen bonds

• Its metallic bonds

• Its non-polarity

• Its ionic nature

Which of the following is NOT a giant covalent structure?

• Silicon Dioxide

• Water

• Silicon

• Diamond

How are atoms bonded in silicon dioxide?

• Each silicon atom is bonded to four oxygen atoms

• Each oxygen atom is bonded to one silicon atom

• Each silicon atom is bonded to two oxygen atoms

• Each oxygen atom is bonded to four silicon atoms

Why do giant covalent structures not conduct electricity?

• They have free moving electrons

• They are soluble in water

• They lack free moving electrons

• They have weak covalent bonds

What is a common property of giant covalent structures?

• Low melting points

• High solubility in water

• High hardness

• Good electrical conductivity

Which of the following statements about giant covalent structures is true?

• They form discrete molecules

• They have low boiling points

• They are soluble in polar solvents

• They have strong covalent bonds