Chemistry of Carbon 1.50-2.13
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1.50 What is the structure of a diamond (include physical properties , including electrical and hardness)
• Made up of carbon atoms 2.Each atom bonded to 4 others • Strong covalent bonds so very hard to break . • the strong covalent bonds hold the atoms in a rigid lattice position so it is very hard. • it doesn’t conduct electricity as it has no free electrons.
1.50 What is the structure of a C60 Fullerene (include physical properties , including electrical and hardness).
1) fullerene molecules are hollow sphere made up 60 carbon atoms. 2) fullerene isn’t a giant covalent structure , its just made up of large covalent molecules. 3) the molecules are only held together by intermolecular forces 4) has one delocalised electron , however cannot move between molecules so a poor conductor.
1.50 What is the structure of a graphite (include physical properties , including electrical and hardness)
1) Each carbon atom forms 3 covalent bonds. 2) Has layers of carbon atoms —> held by weak intermolecular forces so can slide over each other. This makes graphite slippery and soft 3) Graphite has high melting point as covalent bonds need lots of energy to break. 4) 3 out of each carbon four outer electron are used in bonds. each carbon atoms has one free electron , so can conduct
1.51Do covalent compounds usually conduct electricity?
NO except graphite
2.12 What is thermal decomposition?
Breakdown of Compounds using heat as energy.
2.12 How is CO2 formed from the thermal decomposition of metal carbonates, including copper(II) carbonate
Formula for thermal decomposition for copper(II) carbonate : CUCO3(s) —> CuO(s) + CO2(g) 1) Heat the copper(II) carbonate then collect the gas given off the test tube. 2) The gas can be tested to see if it CO2 by using limewater test.
2.13 What is the issue of CO2 in atmosphere?
• CO2 is a greenhouse gas meaning it acts as an insulating layer as they absorb heat that would normally be radiated out into space. • increasing amounts of CO2 in atmosphere can cause global warming and climate change