L11 Giant covalent structures Part II

• Chem
• Secondary Education

• You can go to the bathroom until 9:50AM. Leaving the room during our session is NOT allowed.
• Keep your shirt tucked in. The person who is untucked will PRESENT A TOPIC NEXT WEEK.
• Prepare your chemistry materials.
• Put your phone in the tray.

Before we begin:

Lesson 11

Giant Covalent Structures

10-10-2022

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• make a 3D model of diamond and /or graphite as giant covalent structures using candies and toothpicks
• explain metallic bonding (by Ratanak)

Success Criteria

Language 

development

• giant covalent structure
• physical properties
• covalent bonding
• hardness

Know the keywords

• appearance
• electrical conductivity

• each carbon atom bonds with four other carbons, forming a tetrahedron

Diamond

• All the covalent bonds are identical, very strong.
• There are NO intermolecular forces.

Diamond

Physical properties:

- does NOT conduct electricity

- very high melting point extremely dense and hard

Diamond

• Each carbon atom is bonded to three others forming layers of hexagonal-shaped forms, leaving one free electron per carbon atom

Graphite

• Free (delocalised) electrons exist in between the layers and are free to move through the structure and carry charge, hence graphite CAN conduct electricity.

Graphite

• The covalent bonds within the layers are very strong BUT the layers are connected to each other by weak forces only, hence the layers CAN slide over each other making graphite slippery and smooth

Graphite

PHYSICAL PROPERTIES

- CAN conduct electricity

- has VERY HIGH melting point

- is soft and slippery, less dense than diamond

Graphite

3D Model-making

• Group work
• Make 3D model of:

- T1, 2, 5: Diamond

- T3, 4: Graphite 

• You only have 10 minutes.
• Checking!

Writing your Conclusion

• Individual; written
• Write your final answers to the given questions.
• You only have 7 minutes.
• Checking!

Self - Evaluation
😁 - I can do this! I am ready to try something new.
😅 - I am getting there! I need a bit of help. I am a bit unsure. I might need to practice.
😬 - I need help! I don't understand this. I am not ready to move on yet.

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• Tuesday - End of Chapter 3 Test 3
• Wednesday - Project-planning and initial construction
• Friday - Chapter 4.1 , Lesson 12. Molecular formulae

Up next!