What happens when amorphous silicon is heated?

What happens when amorphous silicon is heated?
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Answer :

When amorphous silicon is heated in air, it oxidizes at the surface level & catches fire.
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During preparation of amorphous silicon, the product is washed with hydrofluoric acid to

Description : During preparation of amorphous silicon, the product is washed with hydrofluoric acid to

Last Answer : remove unreacted silica.

During preparation of amorphous silicon, product is washed with

Description : During preparation of amorphous silicon, product is washed with

Last Answer : dilute hydrochloric acid to dissolve magnesium oxide.

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Description : Amorphous silicon is obtained by heating silica with

Last Answer : magnesium powder.

Compare the properties of amorphous and crystalline silicon

Description : Compare the properties of amorphous and crystalline silicon

Last Answer : morphous silicon It is a brown powder It does not conduct electricity at low temperatures. It is more reactive than crystalline silicon When heated in air, it oxidizes at the surface level ... electricity It is less reactive than amorphous silicon It does not burn in air even when heated

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Description : What is the role of the following in the extraction of amorphous silicon? a) Hydrochloric acid b) hydrofluoric acid

Last Answer : a) Hydrochloric acid is used to dissolve magnesium oxide b) Hydrofluoric acid is used to remove unreacted silica

Briefly explain the extraction of amorphous silicon.

Description : Briefly explain the extraction of amorphous silicon.

Last Answer : Finely powdered silica (sand or quartz) is mixed with magnesium powder and heated in a fire clay crucible. Magnesium oxide and silicon are formed

State the application of following materials : i) CRGO Silicon Steel ii) HRGO Silicon Steel iii) Amorphous metal iv) Bronze

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Last Answer : When a mixture of silicon and coke is heated in an electric furnace, silicon carbide is formed. It is an endothermic reaction. Si + C SiC

In vulcanization, natural rubber is heated with- (1) Carbon (2) Sulphur (3) Silicon (4) Phosphorus

Description : In vulcanization, natural rubber is heated with- (1) Carbon (2) Sulphur (3) Silicon (4) Phosphorus

Last Answer : (2) Sulphur Explanation: Vulcanization of rubber is a process of improvement of the rubber elasticity and strength by heating it in the presence of sulfur, which results in three-dimensional crosslinking of the chain rubber molecules (polyisoprene) bonded to each other by sulfur atoms.

Charcoal is (a) Amorphous (b) Crystalline (c) Hygroscopic (d) None of these

Description : Charcoal is (a) Amorphous (b) Crystalline (c) Hygroscopic (d) None of these

Last Answer : Ans:(a)

Diamond is the form of carbon that is (a) Crystalline (b) Amorphous (c) Chemical (d) Alkaline

Description : Diamond is the form of carbon that is (a) Crystalline (b) Amorphous (c) Chemical (d) Alkaline

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A ligament is (a) A fibrous tissue that joins the muscle to bone (b) A type of amorphous gel that cements non movable joints together (c) A type of fibrous connective tissue that joins bones together at joints (d) Only formed to repair damaged muscle tissue

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On heating, a white amorphous inorganic compound becomes yellow and on cooling, turns white again. The salt may be

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Diamond is the form of carbon that is - (1) Crystalline (2) Amorphous (3) Chemical (4) Alkaline

Description : Diamond is the form of carbon that is - (1) Crystalline (2) Amorphous (3) Chemical (4) Alkaline

Last Answer : (1) Crystalline Explanation: Diamond is a solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic.

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Last Answer : (B) Polyacrylonitrile

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Last Answer : (D) All (A), (B) and (C)

Orlan fibre which is used as a wool substitute is (A) An amorphous polymer (B) A natural polymeric fibre (C) Polyacrylonitrile (D) Poly-methyl-methacrylate (PMMA)

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Last Answer : (C) Polyacrylonitrile

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Description : Ceramic materials are (A) Organic in nature (B) Stronger in compression than in tension (C) Always amorphous in nature (D) Always bad heat conductors

Last Answer : (B) Stronger in compression than in tension

Which is an amorphous material? (A) Glass (B) Mica (C) Brass (D) Cast iron

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Last Answer : (B) Partly crystalline

How can a material be made amorphous ?

Description : How can a material be made amorphous ? 

Last Answer : By melting the material and by cooling it rapidly.

With increase in temperature, the thermal conductivity of non-metallic amorphous solids (A) Decreases (B) Increases (C) Remain constant (D) First decreases upto certain temperature and then increases

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Ordinary glass is not a/an (A) Amorphous isotropic material (B) Supercooled liquid (C) Material with sharp definite melting point (D) Electrical insulator

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Last Answer : (C) Material with sharp definite melting point

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Last Answer : A) Low impact strength

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In calculus formation, the epitaxic concept is one of the theories. Which of the following is true: a. Mineralisation occurs when calcium and phosphate content is high. b. The presence of matrix would start initial formation of nucleus. c. The amorphous materials would convert to calcium phosphate and hydroxy phosphate.

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In calculus formation the epitaxic concept is one of the theories. Which of the following is true: A. Mineralisation occurs when calcium and phosphate content is high B. The presence of matrix would initiate the formation of the nucleus C. The amorphous materials would convert to calcium phosphate and hydroxy

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If a material has the capacity to behave either as an acid or a base it is said to be: w) amorphous x) amphoteric y) anhydrous z) aklaline

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Last Answer : ANSWER: X -- AMPHOTERIC

For a substance, density, solubility and melting point are examples of: w) physical properties x) amorphous properties y) chemical properties z) potential properties

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Last Answer : ANSWER: W -- PHYSICAL PROPERTIES

Which of the following substances is classified as amorphous? w) glass x) Zinc y) diamond z) sodium chloride

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Explain any four advantages of amorphous transformer.

Description : Explain any four advantages of amorphous transformer.

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State the advantages of amorphous core type distribution transformer.

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Last Answer : Advantages of amorphous core type distribution transformer: 1) Increases efficiency of transformer as constant losses are reduced by 75 % compared to conventional transformers. 2) The material has high ... . 7) High Reliability. 8) Excellent short circuit capacity. 9) Less maintenance cost.

What is amorphous metal material? Give any three properties of amorphous metal.

Description : What is amorphous metal material? Give any three properties of amorphous metal.

Last Answer : Amorphous metal: The amorphous is metal alloy which differ in crystalline structure. The atoms are arranged in random configuration.  Properties of amorphous metal: 1) Thermal conductivity of ... . 6) The alloy does not undergo shrinkage on solidification, which helps in bones attachments.

What is Amorphous metal? Give one application of this metal.

Description : What is Amorphous metal? Give one application of this metal.

Last Answer : Amorphous Metals: Amorphous Metals means materials that do not possess a particular structure. Metal alloys typically possess crystalline atomic structure. The atoms are arranged in particular ... cores of special transformers d) Manufacturing magnetic sensors e) Magneto-motive sensors 

What happens when silicon is burnt in air?

Description : What happens when silicon is burnt in air?

Last Answer : Silicon burns brilliantly in air and vigorously in oxygen to form silicon dioxide. It is an exothermic reaction. Si + O 2 SiO 2

What happens when gold ornament is heated with dilute nitric acid?

Description : What happens when gold ornament is heated with dilute nitric acid?

Last Answer : The copper constituent of the ornament reacts with the acid forming greenish copper nitrate solution and reddish brown fumes of nitrogen dioxide. Gold remains unaffected.

What happens when heated aluminium powder is sprinkled into a jar of chlorine gas?

Description : What happens when heated aluminium powder is sprinkled into a jar of chlorine gas?

Last Answer : As heated aluminium powder comes in contact with chlorine, bright flashes are seen forming aluminium chloride.

What happens when: a) When a mixture of sodium acetate and soda lime is heated in a hard glass test tube.

Description : What happens when: a) When a mixture of sodium acetate and soda lime is heated in a hard glass test tube.

Last Answer : Methane gas is evolved. CH 3 COONA + NaOH CaO Na 2 CO 3 + CH 4 b) Methane is burnt in air or oxygen or methane undergoes complete combustion. It forms carbon dioxide and water. CO 2 + H ... ultraviolet light (sunlight). Organic product chloromethane is formed CH 4 + Cl 2 UV CH 3 Cl + HCl

What happens when a piece of bangle is heated in a candle flame?

Description : What happens when a piece of bangle is heated in a candle flame?

Last Answer : When a piece of bangle is heated in a candle flame, it first becomes soft and then melts as glass does not have a definite melting point.

What happens when ethanol is heated with acidified potassium dichromate solution? Write the chemical equation.

Description : What happens when ethanol is heated with acidified potassium dichromate solution? Write the chemical equation.

Last Answer : Answer. Ethanol is oxidised to ethanoic acid with the help of acidified K2Cr2O7. CH3CH2OH + 2O → CH3COOH + H2O

What happens when is heat is added to silicon?

Description : What happens when is heat is added to silicon?

Last Answer : happens when heat is added to silicon?

What happens when heat is added to silicon ?

Description : What happens when heat is added to silicon ?

Last Answer : happens when heat is added to silicon?

Inside the ____ is a gas generator containing a mixture of NaN3 (Sodium Azide), KNO3 (Potassium Nitrate) and SiO2 (Silicon Dioxide). When the undesired event happens, an electric circuit is turned on by a sensor, and a series of chemical reactions generate nitrogen gas that fills ____ in 20 to 30 milliseconds. Fill up the blank

Description : Inside the ____ is a gas generator containing a mixture of NaN3 (Sodium Azide), KNO3 (Potassium Nitrate) and SiO2 (Silicon Dioxide). When the undesired event happens, an electric circuit is ... chemical reactions generate nitrogen gas that fills ____ in 20 to 30 milliseconds. Fill up the blank

Last Answer : Air-bags in automobiles.

What happens when baking soda is heated? -Chemistry-10

Description : What happens when baking soda is heated? -Chemistry-10

Last Answer : Sodium hydrogen carbonate (also known as sodium bicarbonate or bicarbonate of soda) has the chemical formula NaHCO3. When it is heated above about 80°C it begins to break down, forming sodium carbonate, water and carbon dioxide. This type of reaction is called a thermal decomposition.