Giant Covalent Molecules
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A series of free IGCSE Chemistry Activities and Experiments (Cambridge IGCSE Chemistry).
Giant Covalent Molecules: Diamond and silicon dioxide
• Small covalent molecules have low melting and boiling points. This is because they have very weak intermolecular forces.
• Giant covalent molecules have millions of strong covalent bonds.
• Giant covalent molecules are always solids at room temperature. They always have high melting and boiling points.
• Diamond is formed from the element carbon. Each carbon atom forms four strong covalent bonds. They cannot conduct electricity because there are no free electrons to carry electrical charge.
• Silicon dioxide is another example of a giant covalent molecules. It consists of silicon and oxygen atoms.
Graphite
• Graphite has a high melting and boiling point.
• Graphite is soft and slippery.
• Graphite is an excellent conductor of both electricity and of heat.
• Graphite is formed from the element carbon. Each carbon atom forms three covalent bonds.
• The carbon atoms form hexagonal rings. The hexagonal rings are in layers. There are no covalent bonds between the layers so they can slide.
• Delocalised electrons can move. This means they can conduct thermal energy (heat) and electricity.
You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.
More Lessons for IGCSE Chemistry
Math Worksheets
Giant Covalent Molecules: Diamond and silicon dioxide
• Small covalent molecules have low melting and boiling points. This is because they have very weak intermolecular forces.
• Giant covalent molecules have millions of strong covalent bonds.
• Giant covalent molecules are always solids at room temperature. They always have high melting and boiling points.
• Diamond is formed from the element carbon. Each carbon atom forms four strong covalent bonds. They cannot conduct electricity because there are no free electrons to carry electrical charge.
• Silicon dioxide is another example of a giant covalent molecules. It consists of silicon and oxygen atoms.
Graphite
• Graphite has a high melting and boiling point.
• Graphite is soft and slippery.
• Graphite is an excellent conductor of both electricity and of heat.
• Graphite is formed from the element carbon. Each carbon atom forms three covalent bonds.
• The carbon atoms form hexagonal rings. The hexagonal rings are in layers. There are no covalent bonds between the layers so they can slide.
• Delocalised electrons can move. This means they can conduct thermal energy (heat) and electricity.
Rotate to landscape screen format on a mobile phone or small tablet to use the Mathway widget, a free math problem solver that answers your questions with step-by-step explanations.
You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.
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