Question

Condensation of steam is not a chemical change:
(A) True
(B) False

Answer 1

Hint: To answer the question, we should know about physical and chemical changes. We should know that physical changes appear and chemicals change in its chemical composition.

Step by step answer:
First we should know about physical and chemical change. We will describe physical and chemical change one by one.
We will understand physical change by taking examples. Let us take the example of juice. We make juice by blending fruits. We should know that it involves two physical changes: the change in shape of each fruit and the mixing together of many different pieces of fruit. We should know that cutting, tearing, shattering, grinding, and mixing are further types of physical changes. When we mix salt and pepper, it will create a new substance without changing the chemical makeup of either component.
Now, we will understand chemical changes. We can say that chemical changes are known by chemical reactions. In a chemical reaction, the reactants are transformed into products. We should know that the formation of gas bubbles is often the result of a chemical change. But here we should note that formation of vapours during boiling of water is not a chemical change. We should know that rotting, burning, cooking, and rusting are all further types of chemical changes because they produce substances that are entirely new chemical compounds.
So, by reading the above two paragraphs we can say that condensation of steam is a physical change. In condensation of steam, vapours present in steam transformed into liquid. But here we should note that, composition of steam remains the same. The composition of steam will be the same as liquid after condensing of steam.
So, now we can say that the statement mentioned in question is a true statement. Condensation of steam is not a chemical change, but actually it is a physical change.

Note: We should also know that colour change or release of odour is a chemical change. We should know that the colour of the element chromium is determined by its oxidation state; a single chromium compound will only change colour if it undergoes an oxidation or reduction reaction.