MEDIUM
9th CBSE
IMPORTANT
Earn 100

The melting of wax is a physical change, but the burning of wax is a chemical change. Explain.

Important Questions on Is Matter Around Us Pure?

MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 2 - Is Matter Around Us Pure?>CHAPTER EXERCISE>Q 28
A solution contains 16 g of urea in 120 g of the solution. What is mass by the mass percentage of a solution?
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 2 - Is Matter Around Us Pure?>CHAPTER EXERCISE>Q 29
A solution of alcohol in water has been prepared by mixing 150 mL of alcohol with 600 mL of water. Calculate the volume percentage of the solution.
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 2 - Is Matter Around Us Pure?>CHAPTER EXERCISE>Q 30
A solution contains 50 mL of alcohol mixed with 150 mL of water. Calculate the concentration of this solution.
HARD
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 2 - Is Matter Around Us Pure?>CHAPTER EXERCISE>Q 31
The solubility of potassium nitrate at 20°C is 32 g per 100 g of water. How much salt is required to prepare 66 g of its saturated solution?
HARD
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 2 - Is Matter Around Us Pure?>CHAPTER EXERCISE>Q 32
How many litres of 15% (mass/volume) sugar solution would it take to get 75 g of sugar? Calculate the mass by volume percentage of the solution.
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 2 - Is Matter Around Us Pure?>CHAPTER EXERCISE>Q 33
Draw a flow sheet diagram showing the separation of various components of a mixture containing camphor, sand and iron filings.
HARD
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 2 - Is Matter Around Us Pure?>CHAPTER EXERCISE>Q 34
Describe the process to show that the dye used in blue/black ink is a mixture of two or more components with a diagram.
HARD
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 2 - Is Matter Around Us Pure?>CHAPTER EXERCISE>Q 35
How will you separate the components of a mixture containing two miscible liquids? Give experimental details.