Advertisements
Advertisements
Question
Why is solid carbon dioxide known as dry ice ?
Solution
Solid carbon dioxide is known as dry ice because it resembles ice and does not melt on heating. When we heat solid carbon dioxide it directly gets converted to vapour without passing through the liquid state.
APPEARS IN
RELATED QUESTIONS
What do you understand by the change of phase of a substance?
What is the (a) common unit of temperature, and (b) SI unit of temperature ?
Why does the temperature remain constant during the melting of ice even though heat is supplied continuously ?
Explain why, naphthalene balls kept in stored clothes in our homes disappear over a period of time.
Fill in the blanks:
The molecules are at a greater distance in ______ compared to liquids.
Write whether the following statement is true or false:
Solids have the larger inter-molecular space
In the paragraph below, write ‘solid’, ‘liquid’ or ‘gas’ in each of the brackets depending on the substance referred to just before.
On a bright sunny day, Riya and Gargi are playing with a ball ( ) in the park. Gargi feels thirsty. So, Riya brings tender coconut water ( ) for her. At the same time, a strong breeze ( ) starts blowing and it also begins to rain ( ). They run back into the house ( ), change their clothes ( ), and then their mother gives them a cup ( ) of hot milk ( ) to drink.
Photosynthesis is a natural process by which green plants manufacture food in the presence of sunlight.
Can the change be reversed or is it irreversible?
Give the reason for the following
Solids cannot be compressed, but gases are highly compressible.
Complete the blank with reference to interconversion of matter on the basis of kinetic theory-with the word ‘increase’, ‘decreases’, ‘gain’, ‘lose’, or ‘overcome’ in the following case.
During vaporization, the liquid particles ____________ energy.
