science for 3 grade

Sodium hydrogen carbonate is also known as sodium bicarbonate or baking soda because it decomposes on heating to generate bubbles of carbon dioxide (leaving pores in cakes or pastries and making them light and fluff..

Sodium carbonate exists as anhydrous (Na 2 CO 3 ) and also as hydrated salt. The decahydrated salt (Na 2 CO 3 .10H 2 O) is known as washing soda while the anhydrous salt is called soda ash. It occurs native as Na 2 CO 3 .NaHCO 3 .H 2 O) in Egypt, and as 'Reh..

Metals have 1 to 3 electrons in the outermost shell of their atom..

Question: From the given list, the nitrate which gives metal, NO 2 and O 2 on heating is _______. 1. NH 4 NO 3 2. NaNO 3 3. AgNO 3 4. Cu(NO 3 ) 2 Answer: 3..

Sodium carbonate exists as anhydrous (Na2CO3) and also as hydrated salt. The decahydrated salt (Na2CO3.10H2O) is known as washing soda while the anhydrous salt is called soda as..

Question: Two thin lenses of power +5D and -2D are put in contact with each other. Focal length of the combination is 1. +3 m 2. -3 m 3. 0.33 m 4. -0.33 m Answer: 3..

Question: Two thin lenses of power +5 D and -2 D are placed in contact with each other. Focal length of the combination is 1. +3 m 2. -3 m 3. 0.33 m 4. -0.33 m Answer: 3..

Question: The structural formula of 2-butene is _________. 1. CH 3 - CH = C = CH 2 2. 3. CH 3 = CH - CH 2 - CH 3 4. CH 3 - CH = CH - CH 3 Answer: ..

Carbonate or Hydrogen carbonate Molecular Formula Carbonate or Hydrogen Carbonate Molecular Formula Sodium carbonate Na 2 CO 3 Magnesium hydrogen carbonate Mg(HCO 3 ) 3 Sodium hydrogen carbonate NaHCO 3 Aluminum carbonate A..

Question: Name the following: 1) Two non-hydrated crystalline salts 2) Two neutral salts 3) Two basic salts 4) Two acid salts Answer: 1) Two non-hydrated crystalline salts are: sodium chloride (NaCl) and potassium nitrate (KnO 3 ) 2) Two neutral salts are: sodium chlo..