HARD
7th CBSE
IMPORTANT
Earn 100

What happens when baking soda is added to vinegar? Write a word equation for this reaction. Name the type of change which takes place. 

Important Questions on Physical and Chemical Changes

HARD
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 6 - Physical and Chemical Changes>Long Answer Type Questions>Q 30
What happens when carbon dioxide gas is passed through lime water? Write a word equation for this process. Name the type of change which takes place. 
HARD
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 6 - Physical and Chemical Changes>Long Answer Type Questions>Q 31
When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is this? Explain.
HARD
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 6 - Physical and Chemical Changes>Long Answer Type Questions>Q 32
When a candle burns, both physical and chemical changes take place. Identify these changes.
HARD
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 6 - Physical and Chemical Changes>Long Answer Type Questions>Q 33
Explain why, burning of wood and cutting of wood into small pieces are considered as two different types of changes.
HARD
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 6 - Physical and Chemical Changes>Long Answer Type Questions>Q 34
What happens when magnesium ribbon is burnt in air? Write a word equation for this process. Name the type of change which takes place.
HARD
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 6 - Physical and Chemical Changes>Long Answer Type Questions>Q 35
What happens when magnesium oxide is dissolved in water? Write a word equation for this process. Name the type of change which takes place.
MEDIUM
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 6 - Physical and Chemical Changes>Multiple Choice Questions (MCQs)>Q 36
Which one of the following is not a chemical change?
MEDIUM
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 6 - Physical and Chemical Changes>Multiple Choice Questions (MCQs)>Q 37

Which of the following are physical changes?

A. Melting of iron metal

B. Burning of iron filings

C. Rusting of iron metal

D. Drawing a wire of iron metal