Naphthalene balls disappear with time without leaving any solid. Give reason
Why is solid carbon dioxide called dry ice?
Name A, B, C, D, E and F in the following diagram showing changes in its state
What is dry ice? Why is it so called? Give two uses of dry ice.
Name the technique to separate:
Camphor from salt
How to separate a mixture of a salt and ammonium chloride
How will separate a mixture of iron filling and sand
Give five examples of substances that undergo sublimation.
Give reasons for the following observation:
The smell of hot sizzling food reaches you several meters away, but to get the smell from cold food you have to go close.
With the help of a labelled diagram, describe the method of separating ammonium chloride from a mixture of ammonium chloride and common salt. Mention the difference in the properties of ammonium chloride and sodium chloride which has made this separation possible.
Which method can be used to separate a mixture of sulphur and iron filings
Give reason for the following observations.
a. Naphthalene balls disappear with time without leaving any solid.
What is the difference between dehydrating and drying agents.
Draw a labelled diagram to illustrate the process of sublimation. [3MARKS].
Name the two substances that undergo sublimation.
How would you separate iodine from a mixture of iodine and common salt?
Naphthalene balls disappear with time without leaving any solid.
Describe the method of separating a mixture containing common salt, sand and ammonium chloride.
Which mixture is separated by using the technique of sublimation?
Explain why, naphthalene balls kept in stored clothes in our homes disappear over a period of time.
What is the name of the process due to which dry ice changes into carbon dioxide gas?
Name the technique to separate (a) butter from curd, (b) salt from sea-water, (c) camphor from salt
What is the opposite word of sublimation?
Give two reasons to justify
b. An iron almirah is a solid at room temperature.
What is meant by sublime?
Describe a method to separate a mixture of camphor and sand.
Which method can be used to separate a mixture of naphthalene and common salt ?
A change of state directly from solid to gas without changing into liquid state.