MEDIUM
7th CBSE
IMPORTANT
Earn 100

Write the chemical name and chemical formula of the following:
(a) Lime Water
(b) Milk of Magnesia
(c) Rust
(d) Blue Vitriol
(e) Baking soda
 

Important Questions on Physical and Chemical Changes

MEDIUM
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 6 - Physical and Chemical Changes>Exercise 6.1>Q I

Give one word for the following.

The reaction in which one substance decomposes into two or more substances.

MEDIUM
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 6 - Physical and Chemical Changes>Exercise 6.1>Q I
A physical change is _____. (reversible / irreversible)
MEDIUM
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 6 - Physical and Chemical Changes>Exercise 6.1>Q I
During a chemical change, a _____ (new/old) substance is formed.
EASY
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 6 - Physical and Chemical Changes>Exercise 6.2>Q I
Pure crystals can be obtained from their saturated solution.
EASY
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 6 - Physical and Chemical Changes>Exercise 6.2>Q I
A process in which a chemical change occurs is called _____. (physical reaction / chemical reaction)
EASY
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 6 - Physical and Chemical Changes>Exercise 6.2>Q I
A process of obtaining pure crystals of a substance from its saturated solution _____.
MEDIUM
7th CBSE
IMPORTANT
Exam Guru Science>Chapter 6 - Physical and Chemical Changes>Exercise 6.2>Q IV

If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.

(d) Give two examples of a similar type of change.