Which of the following causes a change in the state of matter?
Changing temperature or pressure
The physical state of matter (solid, liquid or gas) depends on how strongly its particles are held together and how much kinetic energy they have. Changing the temperature or pressure changes this balance: heating gives particles more energy so a solid melts and a liquid boils, while increasing pressure pushes particles closer and can liquefy a gas. This is why temperature and pressure are the factors that cause a change of state.
Cutting a substance only divides it into smaller pieces; each piece stays in the same state. Mixing it with another substance or dissolving it produces a mixture or solution but does not, by itself, change the physical state of the original matter. These are physical changes of form or composition, not changes of state.
Hence, the answer is changing temperature or pressure.
Important Questions from States of Matter
A liquid is heated up to a certain temperature. Which one of the following situation would correspond to the boiling of the liquid?
Which one among the following oxides has the highest melting point?
Equal volume of all gases, when measured at the same temperature and pressure, contain an equal number of particles. Who proposed the above law?
Match List I with List II and select the correct answer using the code given below the Lists:
Code:List I (Noble gas)
List II (Use)
A. Argon
1. In lights for advertising display
B. Neon
2. Airport landing lights and in light houses
C. Krypton
3. Light in photographer’s flash gun
D. Xenon
4. In tungsten filament to last
Match List-I with List-II and select the correct answer using the code given below the Lists:
List I
(Process)
List II
(Type of change)
A. Heating of camphor
1. Chemical
B. Cooling of water vapor up to room temperature
2. Evaporation
C. Cooking an egg
3. Condensation
D. Formation of water vapor at room temperature.
4. Sublimation
