What is meant by the valency of an element?

Important Questions on Symbols, Formulas and Equations

MEDIUM

9th Manipur Board

IMPORTANT

Science for Class 9>Chapter 4 - Symbols, Formulas and Equations>EXERCISES>Q 2

What is meant by the symbol of an element? Explain with examples.

EASY

9th Manipur Board

IMPORTANT

Science for Class 9>Chapter 4 - Symbols, Formulas and Equations>EXERCISES>Q 3

Give two symbols that have been derived from the Latin names of the elements.

EASY

9th Manipur Board

IMPORTANT

Science for Class 9>Chapter 4 - Symbols, Formulas and Equations>EXERCISES>Q 4

What is a molecule? Explain with an example.

MEDIUM

9th Manipur Board

IMPORTANT

Science for Class 9>Chapter 4 - Symbols, Formulas and Equations>EXERCISES>Q 5

What is meant by a chemical formula? Write the formula of three elements and two compounds.

MEDIUM

9th Manipur Board

IMPORTANT

Science for Class 9>Chapter 4 - Symbols, Formulas and Equations>EXERCISES>Q 6

Explain the difference between $2\mathrm{N}$ and ${\mathrm{N}}_2$.

MEDIUM

9th Manipur Board

IMPORTANT

Science for Class 9>Chapter 4 - Symbols, Formulas and Equations>EXERCISES>Q 7

Define the molecular mass of a substance.

MEDIUM

9th Manipur Board

IMPORTANT

Science for Class 9>Chapter 4 - Symbols, Formulas and Equations>EXERCISES>Q 8

Calculate the molecular masses of Ethane$\left({\mathrm{C}}_2{\mathrm{H}}_6\right)$.

HARD

9th Manipur Board

IMPORTANT

Science for Class 9>Chapter 4 - Symbols, Formulas and Equations>EXERCISES>Q 8

Calculate the molecular masses of Calcium carbonate$\left({\mathrm{CaCO}}_3\right)$.