Effect of Change of Pressure on State Change of Matter

Q. Give reasons :
(a) When a stone is dipped in a glass containing some water, the level of water rises but when a spoon of sugar is added to it and stirred, the water level does not rise?

Q.

Question 2

A drop of ink added to water in a glass turns the whole water blue. Justify.

Q.

Give reason why separation of mixtures example iron from a mixture of iron and sulphur is a physical change but heating a mixture of iron and sulphur is considered a chemical change.

Q.

Physical change alters chemical properties and chemical change alters physical properties.

Say True or False.

1. True

2. False

Q.

Question 2

A drop of ink added to water in a glass turns the whole water blue. Justify.

Q. Why cooking food takes a lot of time on a hill?

Q.

What is the term given to the device used for reducing gases or vapors to liquids or solid forms?

1. Condensating delivery tube

2. Condensate

3. Condenser

4. Conduit tube

Q. Question 1(c)
Classify the changes involved in the following processes as physical or chemical changes:

Burning of coal

Q. Mahima sprayed a rose fragrance over her shirt while stepping out. People noticed it because perfume molecules would have:

1. reacted with water vapours in the air
2. spread through the space between air particles
3. reacted with oxygen particles in the air
4. combined with each other

Q.

Applying pressure and reducing temperature can lead to:

1. Liquefaction of gases

2. Corrosion of gases

3. Diffusion of gases

4. Evaporation of gases

Q. How does applying pressure help in the liquefaction of a gas?

Q. By applying pressure, particles of matter can be brought closer together.

1. False
2. True

Q. The density of ice is ___________ that of water.

1. higher than
2. very high than
3. lower than
4. same as

Q. When applied pressure, carbon dioxide gets converted into dry ice. Does this mean that carbon dioxide can never be converted into liquid state

Q. State whether the following is physical or chemical change:

Q. What is the practical unit of pressure in meteorological science ?

Q. Applying pressure and reducing temperature can liquefy gases.

1. True
2. False

Q. Which of these is defined as “Standard Pressure”?

1. 14.7 psi
2. 1 atm
3. all the above
4. 760 torr