Page 11 - 8-Sci-5 CHEMICAL REACTIONS

5. CHEMICAL REACTIONS eLearn.Punjab

Through the activity 5.3 we observe the formation of white precipitate of silver chloride
(AgCl) as a product of the reaction between sodium chloride (NaCl) and silver nitrate
(AgNO3) solutions. The balanced chemical equation for the reaction is as follows:

AgNO3(aq) + NaCl(aq) → AgCl(s) + NaNO3(aq)

We also notice that during a chemical reaction total mass of the products is equal to the
total mass of reactants. This verifies the law of conservation of mass.

Activity 5.4 - Higher Order Thinking

Apparatus / Material Required

China dish and pieces of iron

Procedure

• Take some iron nails in the china dish.
• Weigh the china dish along with iron nails with the help of an electric balance.
• Place the china dish containing iron nails in a bathroom for five days.
• Weigh the china dish along with iron nails again

after five days.
• Note whether the weight (mass) of the iron nails

increases, decreases or does not change after
keeping them in the bathroom.
Explain the phenomenon taking place in the
china dish.

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