What is the chemical identity of a molecule?

Important Questions on Physical and Chemical Changes

HARD

7th CBSE

IMPORTANT

EUREKA PLUS Revised Bringing Science to Life>Chapter 6 - Physical and Chemical Changes>EXERCISES>Q 4

The molecules of a substance are made up of just one type of atoms. Is the substance an element or a compound?

HARD

7th CBSE

IMPORTANT

EUREKA PLUS Revised Bringing Science to Life>Chapter 6 - Physical and Chemical Changes>EXERCISES>Q 5

Write the chemical formula of any one compound.

HARD

7th CBSE

IMPORTANT

EUREKA PLUS Revised Bringing Science to Life>Chapter 6 - Physical and Chemical Changes>EXERCISES>Q 1

What is a physical change? Explain with an example.

HARD

7th CBSE

IMPORTANT

EUREKA PLUS Revised Bringing Science to Life>Chapter 6 - Physical and Chemical Changes>EXERCISES>Q 2

Distinguish between an element and a compound.

HARD

7th CBSE

IMPORTANT

EUREKA PLUS Revised Bringing Science to Life>Chapter 6 - Physical and Chemical Changes>EXERCISES>Q 3

What does the following equation explain? 
$2{\mathrm{H}}_2\mathrm{O} \to 2{\mathrm{H}}_2 + {\mathrm{O}}_2$

HARD

7th CBSE

IMPORTANT

EUREKA PLUS Revised Bringing Science to Life>Chapter 6 - Physical and Chemical Changes>EXERCISES>Q 4

Write the name of the following compound: 
$\mathrm{MgO}$

HARD

7th CBSE

IMPORTANT

EUREKA PLUS Revised Bringing Science to Life>Chapter 6 - Physical and Chemical Changes>EXERCISES>Q 4

Write the name of the following compound: 
${\mathrm{H}}_2{\mathrm{SO}}_4$

HARD

7th CBSE

IMPORTANT

EUREKA PLUS Revised Bringing Science to Life>Chapter 6 - Physical and Chemical Changes>EXERCISES>Q 4

Write the name of the following compound: 
$\mathrm{NaOH}$