MEDIUM
7th CBSE
IMPORTANT
Earn 100

A pinch of baking soda is added to vinegar in a test tube. Answer this question on the reaction that occurs.

How can we test whether the gas produced is carbon dioxide?

Important Questions on Physical and Chemical Changes

MEDIUM
7th CBSE
IMPORTANT
CONCERT Science 7>Chapter 6 - Physical and Chemical Changes>STEP IN>Q 5
Write the chemical equation for the reaction used to test for carbon dioxide.
EASY
7th CBSE
IMPORTANT
CONCERT Science 7>Chapter 6 - Physical and Chemical Changes>STEP IN>Q 6
What are the conditions necessary for rusting of iron?
MEDIUM
7th CBSE
IMPORTANT
CONCERT Science 7>Chapter 6 - Physical and Chemical Changes>STEP IN>Q 6
List two ways in which rusting can be prevented.
EASY
7th CBSE
IMPORTANT
CONCERT Science 7>Chapter 6 - Physical and Chemical Changes>STEP IN>Q 6
Why is it important to prevent the formation of rust on iron equipment?
EASY
7th CBSE
IMPORTANT
CONCERT Science 7>Chapter 6 - Physical and Chemical Changes>STEP IN>Q 6
What is galvanization?
MEDIUM
7th CBSE
IMPORTANT
CONCERT Science 7>Chapter 6 - Physical and Chemical Changes>STEP IN>Q 7
What is crystallization? Is it a physical change or a chemical change?
MEDIUM
7th CBSE
IMPORTANT
CONCERT Science 7>Chapter 6 - Physical and Chemical Changes>STEP IN>Q 7
Is crystallization a reversible change? Give reasons for your answer.
MEDIUM
7th CBSE
IMPORTANT
CONCERT Science 7>Chapter 6 - Physical and Chemical Changes>STEP IN>Q 7
Describe an experiment to obtain copper sulphate crystals.