CHEMISTRY QUESTION OF CLASS 9 CHAPTER MATTER IN OUR SURROUNDINGS..... try to answer as much as you can please but question 2 and 3 is compulsory...... :-)
Answers & Comments
armaanian
2) Perfume evaporate when they come in contact with air. The evaporation causes cooling sensation in our hands.
1) Sponge is a solid with minute pores in it. When we press the sponge the air present in these pores is released out hence we are able to compress it.
5) (A). Gases can be compressed easily because the atoms and molecules in gases are much more spread out than in solids or liquids.
(B) Plasma is a state which is caused due to the fission of gases as we know the stars are made up of hydrogen and for giving light it changes into helium. The change in helium from hydrogen is performed by fission. Therefore, plasma state is present in the stars.
Answers & Comments
1) Sponge is a solid with minute pores in it. When we press the sponge the air present in these pores is released out hence we are able to compress it.
5)
(A). Gases can be compressed easily because the atoms and molecules in gases are much more spread out than in solids or liquids.
(B) Plasma is a state which is caused due to the fission of gases as we know the stars are made up of hydrogen and for giving light it changes into helium. The change in helium from hydrogen is performed by fission. Therefore, plasma state is present in the stars.
3) its attached
Answer:
Our hand feels cold when we put perfume becoz the perfume contains acceton which evaporates very quickly thus leaving our palm cold.
Explanation: