Water can be obtained from various sources. Are all these samples of water chemically identical? Class 9

Water can be obtained from various sources. Are all these samples of water chemically identical? Class 9

Think It Over (Page 162)

Question 1.

Water can be obtained from various sources. Are all these samples of water chemically identical? Class 9

Answer:

Yes, all samples of pure water are chemically identical because they have the same composition (H₂O), even though their physical impurities may differ.

Question 2.

Oxygen is sometimes represented as O and sometimes as O₂. What is the difference between these symbols? Class 9

Answer:

O represents a single oxygen atom, while O₂ represents a molecule of oxygen consisting of two oxygen atoms bonded together.

Question 3.

Why does dissolved salt in water conduct electricity, but sugar does not? Class 9

Answer:

Salt dissociates into ions in water, which carry electric current. Sugar does not form ions when dissolved, so it does not conduct electricity.