Explanation

Water vapor is directly related to humidity, which plays a crucial role in weather prediction. 

The amount of water vapor in the air significantly influences cloud formation, precipitation, and temperature. 

Therefore, measuring water vapor content is essential for weather forecasting. 

Explanation

James Simpson, a Scottish doctor, is credited with discovering the anesthetic properties of chloroform in 1847

Explanation

The primary chemical composition of marble is Calcite. 

Marble is primarily composed of calcium carbonate (CaCO3), which is the mineral calcite. 

Explanation

• Red Phosphorus is the primary substance used in matchsticks 

Additional information:

• Sulphur: Only acts as a secondary fuel in the match head to keep the flame burning.
• Zinc: Completely unused in the chemical composition of standard matches.

Last updated 18-07-2026 by NA

Explanation

Chemical changes involve a transformation where new substances with different properties are created.

It often through reactions like combustion, rusting, or digestion.

Explanation

Number of neutrons = Atomic mass - Atomic number

= 27 - 13 = 14

Atomic number (13) gives the number of protons, and subtracting it from the atomic mass gives the neutrons.

Explanation

Methyl orange is a pH indicator that turns yellow in alkaline solutions.

In acidic solutions, it appears red, but in basic or alkaline solutions, it changes to yellow.

Explanation

Explanation

Polymerization is the process where small molecules (monomers) repeatedly bond to form large molecules (polymers).

It's commonly used in making plastics, synthetic fibers, and resins.

Explanation