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Asked/Added Questions From NCERT:


Answer:

Akki chauhan

 (a) sugar C12H22O11

 (b) Glucose C6H12O6

 (c) Vinegar CH3COOH

 (d) Pyruvic C3H4O3

 (e) Tartaric C4H6O6

-Answered by Akki chauhan On 05 July 2019:09:13:27 AM


Question 2. Asked on :02 July 2019:04:47:31 PM

Why the cooking utensils are made up of aluminum brass and steel?


-Added by Himanshi Verma Science » Chemistry

Answer:

Akki chauhan

 Cooking utensils are made up of metal because utensils need to conduct heat well, but also need to chemically unreactive so that they do not alter the flavor of the food . most material that conductive enough to heat evenly are to use in food preparation.

-Answered by Akki chauhan On 05 July 2019:09:05:00 AM


Question 3. Asked on :22 March 2019:04:32:24 PM

 Why it is dangerous to sleep in an unventilated room with fair burning

-Added by Gunnaj sheikh Science » Chemistry

Answer:

Himanshi Verma

 It is dangerous to sleep in an inventilated room with fire burning inside because the fire produce carbon monoxide and carbon dioxide gases which are very harmful for us.

-Answered by Himanshi Verma On 22 March 2019:04:37:33 PM


Question 4. Asked on :11 February 2019:09:34:51 AM

 what do you mean by borax ?


-Added by Himanshi Verma Science » Chemistry

Answer:

Himanshi Verma

 Borax, also known as sodium borate, sodium tetraborate, or disodium tetraborate, is an important boron compound, a mineral, and a salt of boric acid. Powdered borax is white, consisting of soft colorless crystals that dissolve easily in water. Borax has a wide variety of uses.

-Answered by Himanshi Verma On 11 February 2019:05:42:09 PM


Question 5. Asked on :11 February 2019:09:30:54 AM

 why do we need to classify elements ?


-Added by Himanshi Verma Science » Chemistry

Answer:

Himanshi Verma

 The number of elements discovered has increased, making it difficult to remember the behavior and properties of these elements. Hence it is important to classify elements according to their properties. ... It helps us understand how different elements form different compounds.

-Answered by Himanshi Verma On 11 February 2019:05:42:36 PM


Question 6. Asked on :27 January 2019:11:20:09 AM

 find the very reactive  metals? 


-Added by SURAJ KUMAR Science » Chemistry

Answer:

Himanshi Verma

 Francium is the high reactive metal.

-Answered by Himanshi Verma On 02 February 2019:01:42:40 PM


Question 7. Asked on :27 January 2019:11:11:38 AM

 find the atomic number and valancy of potasium

-Added by kunal kumar Science » Chemistry

Answer:

Himanshi Verma

 Atomic number is 19 and valency is 1

-Answered by Himanshi Verma On 02 February 2019:01:44:01 PM


Question 8. Asked on :27 January 2019:11:02:35 AM

 write the formula of bleching power.

-Added by SURAJ KUMAR Science » Chemistry

Answer:

Nitish kumar

 Ca(ClO)2

-Answered by Nitish kumar On 27 January 2019:03:13:16 PM


Question 9. Asked on :27 January 2019:10:27:57 AM

 write the equation of endothermic and exothermic reaction ?

-Added by praful kumar Science » Chemistry

Answer:

Himanshi Verma

 Endothermic reaction examples equations

Endothermic vs. exothermic reactions
  • The teacher replies: “That's because you were given two different salts. ...
  • Consider the reaction mixture—salt plus water—as the system and the flask as the surrounding.
  • 1) Photosynthesis: Plants absorb heat energy from sunlight to convert carbon dioxide and water into glucose and oxygen.

-Answered by Himanshi Verma On 02 February 2019:01:48:05 PM


Question 10. Asked on :16 January 2019:06:16:06 PM

 Which of the following subtances undergo sublimation on heating 

a) Iodine     b) Napthelene             c) Camphor 

-Added by Himanshi Verma Science » Chemistry

Answer:

Master Purushottam
 The subtances which undergo sublimation on heating is napthelene and camphor.

-Answered by Master Purushottam On 24 August 2019:12:14:51 AM


Question 11. Asked on :14 January 2019:09:16:13 AM

 Write the chemical formula of Sodium bicarbonate


-Added by Akki chauhan Science » Chemistry

Answer:

Master Purushottam
  NaHCO3

-Answered by Master Purushottam On 23 August 2019:11:48:39 PM


 

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