KPK 9th Class Chemistry Chapter 5 Physical States of Matter Short Questions Answers
KPK 9th Class Chemistry Chapter 5 Physical States of Matter Short Questions with answers are combined for all 9th class(Matric/ssc) Level students.Here You can prepare all Chemistry Chapter 5 Physical States of Matter short question in unique way and also attempt quiz related to this chapter.Just Click on Short Question and below Answer automatically shown. After each question you can give like/dislike to tell other students how its useful for each.
Class/Subject: 9th Class Chemistry
Chapter Name: Physical States of Matter
Board: All KPK Boards
- Malakand Board 9th Class Chemistry Chapter 5 Physical States of Matter short questions Answer
- Mardan Board 9th Class Chemistry Chapter 5 Physical States of Matter short questions Answer
- Peshawar Board 9th Class Chemistry Chapter 5 Physical States of Matter short questions Answer
- Swat Board 9th Class Chemistry Chapter 5 Physical States of Matter short questions Answer
- Dera Ismail Khan Board 9th Class Chemistry Chapter 5 Physical States of Matter short questions Answer
- Kohat Board 9th Class Chemistry Chapter 5 Physical States of Matter short questions Answer
- Abbottabad Board 9th Class Chemistry Chapter 5 Physical States of Matter short questions Answer
- Bannu Board 9th Class Chemistry Chapter 5 Physical States of Matter short questions Answer
Helpful For:
- All KPK Boards 9th Class Chemistry Annual Examination
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KPK 9th Class Chemistry Chapter 5 Physical States of Matter Short Questions Answers
Can you give reason, why it takes longer time to cook at high altitude?
At high altitude pressure is less. At low pressure, the boiling point temperature of water is also less. Since boiling point is less at high altitude; it takes more time to cook there. That is why we are using Pressure cooker to quicken the cooking process.
Glass softens at over a wide range or temperature Ice melts at a specific temperature. Explain the reason for this difference.
Glass is actually amorphous solid which have no sharp melting point but on the other hand ice is a crystalline solid so has sharp melting point. That is why; Glass softens at over a wide range of temperature while ice melts at a specific temperature.
Explain why it happens that on a hot summer day when there is sweat on the body of a person, one feels cool under fast moving fan?
This is due to the reason that under fan evaporation occurs at fast rate. And when evaporation occurs, the liquid (sweat in this case) absorbs heat from the surroundings in order to evaporate. Thus, it takes a lot of heat from out body as well. Our skin thus becomes cool.
Why the densities of gases are lower than that of liquids?
A gas usually has much lower density than a liquid. The reason is that, the molecules or atoms in a gas are much apasrt away than a liquid because of negligible inter-molecular forces. Thus Gas molecules or atoms are usually flying around at very high speed, and occupy more space and have low densities.
What is the relationship between atmospheric pressure and boiling point of a liquid?
The boiling point is the temperature at which the vapor pressure of the liquid equals the atmospheric pressure and the liquid changes to vapor.
Generally the atmospheric pressure and boiling point are directly related. Lower the atmospheric pressure lower will be the boiling temperature and vice versa.
Example
Liquids have low B.P at high altitude, where atmospheric pressure is low.
Liquids have higher B.P in pressure cocker, which exerts high external pressure.
Why a gas is compressible and solid is not compressible? Give reason.
Gasses are the most compressible because there are very l;arge inter-molecular spaces. Solids are the least compressible because the inter-molecular spaces are very tiny not enough to allow visible compression.
