Question

• Take three 100 mL syringes and close their nozzles by rubber corks.
• Remove the pistons from all the syringes.
• Leaving one syringe untouched, fill water in the second and pieces of chalk in the third.
• Insert the pistons back into the syringes. You may apply some vaseline on the pistons before inserting them into the syringes for their smooth movement.
• Now, try to compress the content by pushing the piston in each syringe.
• What do you observe? In which case was the piston easily pushed in?
• What do you infer from your observations?

NCERT Class 9th Science Ch 1 Matter in Our Surroundings

Answer 1

"1) First-syringe left untouched goes freely as the gases have the high compression ratio.

2) Second-syringe will compress only a little because of the molecular content in the water.

3) Third-syringe will be very challenging because the molecules and atoms present in chalk.

On first case Piston can be easily pushed in.

Inference:

Solid -> Liquid-> Gases"

Answer 2

#1.) first Syringes move randomly like gas molecules.

#2.) there is some compressibility in second syringe because of the water molecules.

#3.) it is hard to compress the syringe in third case due to strong intermolecular forces between chalk particles.

Piston is pushed more in first case.