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1. Identify the changes involved in the following processes as physical or chemical changes.(d) Curdling of milk.
Curdling milk is a change that results in the formation of a new product called curd, which has a composition that differs from milk.
2. During the reaction of some metals with dilute hydrochloric acid, following observations were made.
Explain these observation giving suitable reason.
(d) Some bubbles of a gas are seen when lead (Pb) is reacted with the acid.
(d) Some bubbles of a gas are seen when lead (Pb) is reacted with the acid.
When lead reacts with , gas bubbles are formed.
Pb(s) + 2HCl(aq) → PbCl_2(aq) + H_2(g)
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