Class 10th - Complete Science - Foundation Chemistry

Complete Science Revision: Key Concepts and Exam Takeaways

Chemical Reactions and Equations A chemical reaction involves the transformation of reactants into products, often represented by a chemical equation. Balancing chemical equations ensures the law of conservation of mass is satisfied, meaning the total mass of reactants equals the...

Which sequence should be followed when balancing a chemical equation according to the recommended method?

First metals, then non-metals, then oxygen, then hydrogen

Which salt will turn blue litmus red?

Ammonium chloride (NH4Cl)

Which sequence should be followed when balancing a chemical equation according to the recommended method?

First metals, then non-metals, then oxygen, then hydrogen

Which salt will turn blue litmus red?

Ammonium chloride (NH4Cl)

What is dispersion of light?

Dispersion is the splitting of white light into its component colors (VIBGYOR) when passing through a prism. This phenomenon occurs because different colors of light have different refractive indices in a medium, causing them to bend at different angles.

Explain why stars twinkle but planets do not.

Stars twinkle because they are distant point sources of light, and their light undergoes continuous, variable atmospheric refraction due to fluctuating atmospheric density, causing the light reaching the eye to fluctuate. Planets, being closer and extended sources, do not twinkle as light from different parts averages out, preventing the twinkling effect.