Question

1) Describe an experiment to show that ammonia diffuses faster than hydrogen chloride.

2)Give any two examples of sublimation

3)Among all gases hydrogen difuses faster why.
Write the sublimation of naphthalene

4)Define difussion.

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Answer 1

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1) The ammonia gas, having a lower molecular weight than the hydrogen chloride, will diffuse faster and travel a greater length of the tube. Consequently, the white ring of ammonium chloride will form much closer to hydrochloric acid end of the tube

2) Examples of Sublimation

The best example of sublimation is dry ice which is a frozen form of carbon dioxide. When dry ice gets exposed to air, dry ice directly changes its phase from solid-state to gaseous state which is visible as fog. Frozen carbon dioxide in its gaseous state is more stable than in its solid-state.

Another well-known example of sublimation is naphthalene which is an organic compound. Naphthalene is usually found in pesticides such as mothball. This organic compound sublimes due to the presence of non-polar molecules that are held by Van Der Waals intermolecular forces. At a temperature of 176F naphthalene sublimes to form vapours. It desublimates at cool surfaces to form needle-like crystals

3) At any given temperature, small, light molecules (such as H 2, hydrogen gas) diffuse faster than larger, more massive molecules (such as N 2, nitrogen gas) because they are traveling faster, on the average (see heat ; kinetic-molecular theory of gases )

Naphthalene is a solid that sublimes at standard atmospheric temperature with the sublimation point at around 80 °C or 176 °F. At low temperature, its vapour pressure is high enough, 1 mmHg at 53 °C, to make the solid form of naphthalene evaporate into gas

4) Diffusion is the net movement of particles from a region of higher concentration to a region of lower concentration. Diffusion is driven by a gradient in concentration. The concept of diffusion is widely used in many fields, including physics, chemistry, biology, sociology, economics, and finance

Answer 2

Answer:

Ans 2. ammonium chloride, iodine, camphor, dry ice ( solid carbon dioxide), naphthalene, anthracene and benzoic acid.

Ans 2. Diffusion is the net movement of particles from a region of higher concentration to a region of lower concentration. Diffusion is driven by a gradient in concentration. The concept of diffusion is widely used in many fields, including physics, chemistry, biology, sociology, economics and finance.

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