Question

1. Which of the following is a physical change ?
a) Melting of butter
b) Burning of paper
c) Rusting of iron
d) Changing of wheat into bread
2. Milk turning sour is a chemical change ?
a) Physical change
b) Chemical change
c) Reversible change
d) None of these

Answer 1

Answer:

1 melting of butter 2. I don't know

Answer 2

Answer:

1. a) Melting of butter

Melting of butter is a physical change because the butter can be solidified again (i.e. reversible change).

2.b) Chemical change

The souring of milk is classified as a chemical change because it results in the production of sour-tasting lactic acid.

Explanation:

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