Qualification > Sciences
Chemistry Help HERE ONLY !!
godfather93:
germanium is a metalloid and a semiconductor. it has a similar sturcture as that of silicon and it's bonding structure is tetrahedral like carbon.
only when germanium is heated that the electrons of the germanium atoms can become delocalised. but in this case nothing about heat being applied is being said.
Shogun:
--- Quote from: Nanavel on May 30, 2009, 03:04:16 pm ---Questions :
1) wha are the 2 uses of the 5 halogen atoms ??
2) explain by giving its structure why diamond is so hard ?? [4]
3) explain the structure of Diamond ??
4) describe the structure of germanium ?
--- End quote ---
alright; use of chlorine: uised to make PVC, used in making hose hold beach
use of bromine, used in photography, used to make medicine
use in flourine: used to make toothpste, used to add in water for dental care
use idoine, used in the treatment of thyroid gland, used to make medicine
use os astatine, we dont have uses to learn in syllabus, but is used in making medicine, and is used to treat thyroid gland.
2) each carbon atom is held in its place by 4 strong covalent bonds. so diamond is very hard and can be used as jewelry or in drilling or cutting equipment.
3)diamond is tetrahedron in shape. and 4 carbon atoms is covalently bonded with 4 other carbon atom.
4)germanium would have the same structure as carbon and silicon, which would be tetrahedron,
so yes godfather what u said abou germanium is correct, and lil wayne this answer is correct.
and silicon has the same structure and properties as diamond, except the hardness property.
hope this helped nanavil. any othe questions u have plz do ask me ;D
SGVaibhav:
Sulphur reacts violently with magnesium to form the ionic compound magnesium
sulphide. Draw a diagram that shows the arrangement of the valency electrons in this
compound.
Use O to represent an electron from a magnesium atom.
Use X to represent an electron from a sulphur atom. [3]
Please do this
Phosu:
could someone plz send me the marking schemes from june 1997 to nov 2000
Shogun:
--- Quote from: sgvaibhav on May 30, 2009, 03:28:44 pm ---Sulphur reacts violently with magnesium to form the ionic compound magnesium
sulphide. Draw a diagram that shows the arrangement of the valency electrons in this
compound.
Use O to represent an electron from a magnesium atom.
Use X to represent an electron from a sulphur atom. [3]
Please do this
--- End quote ---
ill draw this in paint and give it to u..
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