Is silicon dioxide comprised of one silicon atom covalently bonded to four oxygen atoms>?
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Silicon dioxide, or silica (SiO2), is comprised of one silicon atom covalently bonded to four oxygen atoms . The silicon-oxygen bonds in silica have been found to have both covalent and ionic character, with approximately 50% ionic character and 50% covalent character . The Si-O bond length in silica has been observed to be shorter than the sum of the single-bond radii of silicon and oxygen, indicating the presence of double-bond character . Additionally, the presence of carbon atoms covalently bound to the silicon atoms in silicon oxycarbide glasses (SiOC) creates a more interconnected structure with better strength and chemical stability than conventional silica . In amorphous silicon dioxide networks, strained Si-O bonds can be broken by hydrogen atoms, resulting in the formation of a defect consisting of a threefold-coordinated Si atom with an unpaired electron facing a hydroxyl group .
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| The answer is not explicitly mentioned in the paper. The paper discusses the interaction of hydrogen with amorphous silicon dioxide (a-SiO2) and the formation of new defects. It does not provide information about the atomic structure of silicon dioxide. | |
Open access•Journal Article 104 Citations | The paper does not directly answer the question about silicon dioxide. The paper discusses the nature of silicon-oxygen bonds and the ionic and covalent character of these bonds. It does not specifically mention silicon dioxide or the specific arrangement of silicon and oxygen atoms in the compound. |
| The paper does not explicitly state whether silicon dioxide is comprised of one silicon atom covalently bonded to four oxygen atoms. | |
2 Citations | The paper does not directly mention the composition of silicon dioxide. The paper is about silicon oxycarbide glasses obtained from polysiloxanes. |
4 Citations | The answer to the query is not provided in the paper. The paper discusses the dissociation of SiO bonds in vitreous silicon dioxide, but it does not specifically mention the number of oxygen atoms bonded to a silicon atom in silicon dioxide. |
Related Questions
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Can silicon dioxide affect microbial growth?5 answersSilicon dioxide (SiO2) can indeed influence microbial growth. Research indicates that elevated SiO2 levels may have been an environmental stressor during early eukaryotic evolution, affecting cell size and growth rates. Additionally, SiO2 nanoparticles have shown antimicrobial effects on various bacterial and fungal pathogens, enhancing plant growth attributes and defense enzyme activities. Moreover, the physical absorption of light by microorganisms changes when attached to silicon dioxide microparticles, suggesting a potential affinity for SiO2 and caution in using it for prosthetic production due to biofilm development risks. Furthermore, the presence of silicon dioxide in cultivation mediums can significantly impact bacterial growth activity, with different effects observed based on material type and phosphate concentrations. Overall, SiO2 plays a multifaceted role in influencing microbial growth and interactions.
What is the boiling point, Melting Point of silicon dioxide (SiO2)?4 answersThe boiling point of silicon dioxide (SiO2) is not mentioned in the abstracts provided. However, the melting point of silicon is mentioned in two abstracts. Gasik et al. state that the melting point of silicon is 1415 °C, while Gayler mentions that the melting point of high-purity silicon is 1,411° ± 2° C.
What is the silicon-oxygen bond length?5 answersThe silicon-oxygen bond length in various contexts is as follows: In the context of silicon-oxygen octahedra, the mean bond length Si-O is a function of the mean coordination number of the oxygen atoms (CN) in the octahedron, given by (Si-O)mean = 1.729 + 0.013CN. In the context of solid silicates, a linear correlation has been established between the isotropic 29Si NMR chemical shifts δ- and the "isotropic" mean bond lengths d(Si-O), with the equation δ- = 1.187 × 10^4d(Si-O) - 2014. In the context of interstitial oxygen in silicon, the Si-O length is 1.59 Å. In the context of substitutional oxygen in silicon, the Si-O distance is 1.82 Å. In the context of hexamethylendiammonium-bis(ethylenedioxy)methylsilane, the Si-O bond lengths are 1.749 Å and 1.769 Å.
How to do self healing ceramics using silicon dioxide?5 answersSelf-healing ceramics using silicon dioxide can be achieved through various methods. One approach is to incorporate silicon carbide (SiC) into the ceramic material, as SiC has been shown to enhance the self-healing capacity of ceramics. Another method involves utilizing a composite material consisting of zirconia (ZrO2) and other ceramic particles such as ZrB2 and ZrC. Increasing the volume fraction of ZrO2 in the composite leads to a higher degree of self-healing, with complete defects healing observed at a temperature of 1600 °C. Additionally, the use of Al2O3/SiC composite ceramics has shown self-healing behavior through oxidation reactions under high-temperature environments. By combining these approaches and optimizing the composition and processing conditions, self-healing ceramics with silicon dioxide can be developed.