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Silicon dioxide * has a high melting point - varying depending on what the particular structure is (remember that the structure given is only one of three possible structures), but around 1700°C. Very strong silicon-oxygen covalent bonds have to be broken throughout the structure before melting occurs. * is hard. This is due to the need to break the very strong covalent bonds. * doesn't conduct electricity. There aren't any delocalised electrons. All the electrons are held tightly between the atoms, and aren't free to move. * is insoluble in water and organic solvents. There are no possible attractions which could occur between solvent molecules and the silicon or oxygen atoms which could overcome the covalent bonds in the giant structure. Giant covalent structures are arranged in a continuous lattice. This structure is very strong because of the strong forces between the molecules.
http://www.chemguide.co.uk/atoms/structures/giantcov.html
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∙ 15y ago
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∙ 14y agoThis is due to the large number of covalent bonds in quartz (also known as silicon dioxide) and strong covalent bonds within layers.
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∙ 7y agoits melting point is extremely high in degrees Celsius as it has a very high mass in oxygen. this is because it is a rare metalloid and is a dioxide.
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∙ 12y agoYes the boiling and melting point of quartz is very high because of its compound network structure.
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∙ 10y agoobsidian melting temp. of St. Helena,Ca.[found in]
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∙ 10y agoThis Is True.
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∙ 10y agoTrue
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∙ 11y agoture
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What are three properties of ionic compounds within a crystal lattice?
1.Brittleness 2.High Melting Points 3.High Boiling Points
Do simple molecular substances have high or low melting and boiling points?
Yes, molecular solids have relatively low melting points.
Write two characteristics of organic compound?
The organic compounds readily burn in air. They have high boiling points and low melting points.
What is the properties of transition?
They have to properties of metals. Most have high melting and boiling points. They're excellent conductors of electricity.
What are the 3 properties of electrovalent compounds?
1)high melting and boiling points 2)solubility 3)Electrolytes
The melting and boiling points of quartz are very high because of the compound and network structure.?
ture
What have high melting and boiling points?
metals
What are three properties of ionic compounds within a crystal lattice?
1.Brittleness 2.High Melting Points 3.High Boiling Points
Why do electrovalent compounds have high melting and boiling points?
Electrovalent compounds have high melting and boiling points as they are held by very strong electrostatic force of attraction making the compound stable and therefore they require a lot of energy to break.
How are melting and boiling points affected as altitude is increased?
Boiling point decrease at high altitude.
How is high melting and boiling points related to the structure of the compounds?
The structure of a compound will dictate what intermolecular forces hold the molecules together. The stronger these forces, the higher will be the boiling point.
What are two properties of ionic compounds.?
1)brittleness 2)high melting points 3)high boiling points
Do simple molecular substances have high or low melting and boiling points?
Yes, molecular solids have relatively low melting points.
What are property's on an ionic compound?
They have high melting and boiling points and can conduct electricity when they are molten or a liquid.
What makes rutherfordium unique?
Estimated density, melting and boiling points of rutherfordium are extremely high.
What are the properties of a ionic compound?
They are hard and brittle, conduct electricity in water, and have high melting and boiling points. (:
What are the proerties of metals?
They are shiny, malleable, they have high melting and boiling points, and they are good conductors of heat and electricity.
