Answer the following questions:

i) Setting of curd is regarded as a chemical change, explain why?

ii) Explain with the help of a reaction how baking soda is treated with vinegar?

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Solution

i) Formation of curd is a chemical change, as a curd has a different form, taste and properties than of the milk and it cannot be changed back to milk.

ii) Ethanoic acid reacts with sodium hydrogen carbonate to evolve brisk effervescence of carbon dioxide. The equation for the reaction is as follow:

CH₃COOH + NaHCO₃ $\to$ CH₃COONa + CO₂+ H₂O

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Answer the following questions: i) Setting of curd is regarded as a chemical change, explain why? ii) Explain with the help of a reaction how baking soda is treated with vinegar?

Answer the following questions:

i) Setting of curd is regarded as a chemical change, explain why?

ii) Explain with the help of a reaction how baking soda is treated with vinegar?