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"Liquid silicon dioxide does not reform into a crystal solid when it cools. Instead as the molecules lose energy they are less and less able to move into an ordered position and the result is
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May 08 2019 · Silicon dioxide is a food additive. It is generally safe and occurs in many leafy greens and other vegetables. Inhaling fine particles may cause adverse effects. Learn more here.
Chat OnlineSilicon dioxide Definition safety and effects
May 08 2019 · Silicon dioxide is a food additive. It is generally safe and occurs in many leafy greens and other vegetables. Inhaling fine particles may cause adverse effects. Learn more here.
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The Economy is a course in economics. Throughout we start with a question or a problem about the economy—why the advent of capitalism is associated with a sharp increase in average living standards for example—and then teach the tools of economics that contribute to an answer. For each question the material is in the same sequence.
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Aug 07 2013 · Silicon dioxide compounds have powerful bonding electrons in the outermost shell. Very few or non at all free electrons across the molecules consequently electrons are not able to
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Jan 11 2008 · Favourite answer SiO2 is the chemical formula for silicon dioxide also known as silica. It is familiar to us as the major component of sand and the most prevalent oxide in the Earth s crust.
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Answer all questions. For each question there are four possible answers A B C and D. Choose the one you consider correct and record your choice in soft pencil on the separate Answer Sheet. Read the instructions on the Answer Sheet very carefully. Each correct answer will score one mark. A mark will not be deducted for a wrong answer.
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Jul 16 2008 · Silicon dioxide is typically used as a drying agent or absorbent for other liquids. It is packaged (in those little pillows) in many products like dietary supplements to prevent the moisture in the air from getting to the product and causing a loss of activity or sometimes just to keep the pills from sticking to each other from the moisture.
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Apr 26 2018 · Silicon is the element just under carbon in the periodic table and it s about 135 times more abundant on Earth. Like carbon it has only four electrons in its outer shell so why aren t the macromolecules that form living organisms silicon-based
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Jan 11 2008 · Favourite answer SiO2 is the chemical formula for silicon dioxide also known as silica. It is familiar to us as the major component of sand and the most prevalent oxide in the Earth s crust.
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Oct 01 2010 · The following reaction will result from mixing silicon dioxide with hot concentrated NaOH solution (see 1st link). SiO2 (s) 2 NaOH (aq) --> Na2SiO3 (aq) H2O (l) You are correct in saying it doesn t have H ions. It doesn t act like a Bronsted-Lowry acid. If you want to read about the acid-base theories see the second link.
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Sep 26 2009 · Favorite Answer. Carbon dioxide exists as simple melecular forms. The intermolecular forces of attraction between the CO2 molecules is the weak van der Waals force. Silicon dioxide exists in giant molecular structure where the Si and O atoms are covalently bonded tetrahedrally. In order to melt it a lot of energy is needed to break the strong
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Aug 26 2008 · Silicon dioxide is held together by double covalent bonds. Si(s) 2O(g)=SiO2. In the equation above silicon react with 2 oxygen atoms to form Silicon Dioxide. In this case the silicon ion is an ion with the valence of 4 and each of the two oxygen anions have a valence of –2.---o. Accredit the source. Wow it s been a while since I ve been in
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Oct 29 2010 · silicon dioxide is a giant molecule (macromolecular structure due to extensive network of covalent bonds in the crystalline lattice structure that extends to infinity). since the solubility of a substance is related to the similarity in bond strength in the solvent (water in this case) AND the solute (silicon dioxide in this case) and the
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(Bloomberg) -- Dell Technologies Inc. is exploring options including a potential sale of cloud business Boomi according to people familiar with the matter in the latest effort by Chief Executive Officer Michael Dell to trim down the personal computer maker ll is working with a financial adviser on a divestiture of Boomi which could be valued at up to 3 billion the people said asking
Chat OnlineWHY IS SILICON IMPORTANT TO LIVING THINGS Yahoo Answers
Sep 27 2009 · It is an extremely abundant element on earth typical sand is silicon dioxide.Si is widely used in the electronics construction and pottery industries. Try asking this question in YA "Chemistry."
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Here is his answer. Group IV of the Periodic Table of the Elements contains carbon (C) silicon (Si) and several heavy metals. Carbon of course is the building block of life as we know it.
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No appreciable deposition of silicon dioxide was seen in the kidney livers spleen blood and urine in the animals fed at the 5 level. No gross or microscopic pathology attributable to silicon were seen (Elsea 1958b). The same compound was fed to 20 male and 20 rats at a concentration of 500 mg/kg bw per day for six months.
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Jun 29 2008 · 4 Answers. There is a difference between silica and silica gel David they are two different chemical compounds. Silica is a common name for silicon dioxide SiO2 which is found in abundance in the surface of the earth as the mineral quartz. Silicon dioxide is also the major component of glass. Silica gel is sodium silicate Na2SiO3.
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Answer all questions. For each question there are four possible answers A B C and D. Choose the one you consider correct and record your choice in soft pencil on the separate Answer Sheet. Read the instructions on the Answer Sheet very carefully. Each correct answer will score one mark. A mark will not be deducted for a wrong answer.
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Jun 15 2009 · so if u see diamond you see that each carbon has four covalent bonds making it really strong.. hence why diamond is SOO strong. silicon dioxide has a similar structure. infact one silicon will bond to four carbons to form a giant macromolecular structure (just like diamond) which will require enormous amounts of energy to break down (1700 degrees C). so this energy will be needed to break
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Feb 29 2008 · The chemical compound silicon dioxide also known as silica or silox (from the Latin "silex") is the oxide of silicon chemical formula SiO2 and has been known for its hardness since the 9th century 1 . Silica is most commonly found in nature as sand or
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Jan 14 2008 · Silicon dioxide has a giant covalent structure that consists of strong covalent bonds between silicon and oxygen atoms. These covalent bonds exists throughout the structure. A lot of heat energy is required to overcome this covalent bond. Thus silicon dioxide has a high melting and boiling point. Hope I am not confusing you and this helps.
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Jun 29 2008 · 4 Answers. There is a difference between silica and silica gel David they are two different chemical compounds. Silica is a common name for silicon dioxide SiO2 which is found in abundance in the surface of the earth as the mineral quartz. Silicon dioxide is also the major component of glass. Silica gel is sodium silicate Na2SiO3.
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Aug 07 2013 · Silicon dioxide compounds have powerful bonding electrons in the outermost shell. Very few or non at all free electrons across the molecules consequently electrons are not able to cross through. The compound is electrically neutral. It strongly resists the passage of electrical power so it s a just right insulator.
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