10. Transformation of state of matter

Question:

5 m.

Answer the case-based question:

Knowing that matters can change its states; when a state change occurs, the properties of substances also change. Similarly, if the state change is reversed, the substance will recover the properties which it had before.

Helen to create a smoky effect, she place dry ice (solid \(CO_2\)) was placed in warm water. Instantly, thick white fog appeared.

i. What transformation of state occurs in dry ice?

Vapourisation - solid \(CO_2\) is directly converted to gas
Sublimation - solid \(CO_2\) is converted to liquid
Sublimation - solid \(CO_2\) is directly converted to molten liquid
Sublimation - solid \(CO_2\) is directly converted to gas

ii. What does this conveys about the relation between temperature and kinetic energy of particles?

Higher temperature leading to zero kinetic energy of particles resulting in slower sublimation
Higher temperature leading to high kinetic energy of particles resulting in faster sublimation
Lower temperature leading to high kinetic energy of particles resulting in faster sublimation
Higher temperature leading to low kinetic energy of particles resulting in faster sublimation

iii. Which property of matter determines their melting and boiling points?

Independent on strength of intermolecular force
Strength of intermolecular force attraction of particles
Type of the container used
Colour of the particle

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