Chemical reaction and equations worksheet-2
Fill in the Blanks:
________ is an antioxidant commonly used to prevent rancidity of food.
Food scraps are turned into compost in a compost pile is a _______ change.
Clotting of blood using alum is a _______ change.
Latent finger prints (invisible to eye) are made visible by_______ change.
In the stomach proteins are digested. It is a _______ change.
Rancidity of food is _______ change.
_______ occurs due to aerial oxidation of fats and oils in foods marked by unpleasant smell and taste.
N2 + H2 → NH3 The balanced equation has_______ molecules of ammonia.
SO2 + H2S → 2H2O + 3S _______ is oxidized.
H2(g) + CuO(s) → Cu(s) + H2O(l) _______ is oxidized.
Oxidation is_______ of electron.
In Redox reactions ________occurs.
Oxidizing agent is one which_________ electrons.
The name of HCO3– is_______.
The name of Cr3+ is _______.
The name of PO43– are _______.
Podium hydroxide + _______ → Potassium nitrate + Water
Iron + Copper sulphate → Ferrous sulphate + ______
One mole Na2SO4 contains _______ atoms of Sodium, ______ atoms of Sulphur and _____ atoms of Oxygen.
Write as three digit number.
Copper vessels when exposed to air and water get tarnished by acquiring a thin layer of _____.
Answer keys:
Butylated Hydroxy-Anisole Or Butylated Hydroxy –Toluene Or BHA, BHT
Chemical or Chemical change
Chemical or Chemical change
Chemical or Chemical change
Chemical or Chemical change
Chemical or Chemical change
Rancidity
2
Hydrogen-sulphide,
Hydrogen,
Loss
Both oxidation and reduction occurs. Or Both reduction and oxidation occurs.
Gains
bicarbonate ion
chromium ion
phosphate ion
Nitric acid
Cu Or Copper
214
Basic carbonate