Covalent Substances Flashcards
What are simple covalent substances?
Substances made up of molecules held together by covalent bonds, typically having low melting and boiling points.
True or False: Giant covalent substances have a fixed structure and do not conduct electricity.
False: Some giant covalent substances, like graphite, can conduct electricity.
Fill in the blank: Simple covalent substances usually exist as __________ at room temperature.
gases or liquids
What is a key property of giant covalent substances?
They have high melting and boiling points due to strong covalent bonds throughout the structure.
Which of the following is an example of a simple covalent substance? (A) Diamond (B) Water (C) Silicon Dioxide
B) Water
What type of bonding occurs in simple covalent substances?
Covalent bonding between non-metal atoms.
True or False: Giant covalent substances are typically soluble in water.
False: They are generally insoluble in water.
What is the structure of giant covalent substances?
A three-dimensional network of atoms bonded together by covalent bonds.
Short answer: Name one property that differentiates simple covalent substances from giant covalent substances.
Simple covalent substances have low melting and boiling points, while giant covalent substances have high melting and boiling points.
Fill in the blank: Graphite is a form of __________ that can conduct electricity.
carbon
Which of the following has a giant covalent structure? (A) Methane (B) Graphene (C) Ammonia
B) Graphene
True or False: Simple covalent substances are good conductors of electricity.
False: They are generally poor conductors of electricity.
What is the primary reason for the high melting point of giant covalent substances?
The presence of strong covalent bonds throughout the lattice structure.
Short answer: Describe one use of silicon dioxide in industry.
Silicon dioxide is used in glass production.
What happens to the properties of simple covalent substances when they are heated?
They generally change from solid to liquid or gas, indicating low melting and boiling points.
