Chemistry

Write your observations for the following chemical reactions and name the products formed:

(a) When sugar is heated.

(b) When manganese dioxide is added to potassium chlorate and heated.

(c) When dilute acetic acid is poured on baking soda.

(d) When an aqueous solution of sodium chloride is mixed with an aqueous solution of silver nitrate.

(e) When ammonium chloride is heated with sodium hydroxide.

(f) When water is added to quick lime.

Chemical Reaction

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Answer

(a) When sugar is heated it first melts and then gets charred into a black residue. The products formed are charcoal and water vapour.

(b) When manganese dioxide is added to potassium chlorate and heated it decomposes to give potassium chloride and oxygen.

(c) When dilute acetic acid is poured on baking soda, a strong effervescence is observed. The products formed are sodium acetate, water and carbon dioxide.

(d) A white precipitate is formed when an aqueous solution of sodium chloride is mixed with an aqueous solution of silver nitrate. The products formed are silver chloride and sodium nitrate.

(e) A strong pungent smelling gas is evolved when ammonium chloride is heated with sodium hydroxide. The products formed are sodium chloride, water and ammonia gas.

(f) A large amount of heat energy is evolved when water is added to quick lime. The product formed is calcium hydroxide.

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