Question

A chemical reaction is said to be occured whenever a chemical change takes place.
How can we say that a chemical change has taken place...???
Change in________: Hydrogen and oxygen (both are gases) react to form water (liquid).
Changein________ :Carbondioxide turns clear solution of lime water to milky.
Change in________: Cooking of food
Change in________: Curdling of milk
Evolution of_________: Reactive metals like sodium when react with water or acid evolve hydrogen gas.
________change: Combustion of fuels is a chemical reaction which is associated with evolution of
heat or increase in temperature.

plzzzz help
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Answer 1

please say incomplete sentence and understanding sentence