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Why does the scent of perfume spread?

When chemical substances such as perfume are let loose in a room, their particles mix with the particles of air. The particles of smelly gas are free to move quickly in all directions. They eventually spread through the whole room from an area of high concentration to an area of low concentration.

How does the smell of perfume reaches your nostrils even when we are at a distance from its source?

Perfume has a higher degree of vaporization and its vapour diffuse into the air easily. When perfume is sprayed, its particles diffuse into the particles of air at a very fast rate and reach our nostrils. This enables us to smell the perfume from a distance.

Why do naphthalene balls disappear after some time?

(a): Naphthalene balls disappear with time without leaving any solid because they undergo sublimation i.e., they directly change into vapour without passing through the liquid state. The perfumes contain solvent which carries pleasant smelling vapour.

What naphthalene balls disappear with time without leaving any solid?

(b) We can get the smell of perfume sitting several metres away. Ans. (a) Naphthalene balls disappear with time without leaving any solid, because naphthalene balls sublime and directly changes into vapour state without leaving any solid.

Why naphthalene balls kept in clothes?

Naphthalene balls sublime slowly. When they are placed in clothes, they sublime without leaving any residue. Their role is to drive away any kind of insects which could damage the clothes.

What happens when some naphthalene balls are left in the open?

Solution. When naphthalene balls are left open, due to sublimation they change to vapours and their size decreases.

What happens when naphthalene is heated?

As the naphthalene is heated, heat energy is converted to kinetic energy. Kinetic energy increases and the molecules vibrate faster about their fixed positions and the temperature increases. Naphthalene is in solid state at any temperature below its melting point. The particles can only vibrate at a fixed position.

Why do naphthalene balls sublime?

Naphthalene. Naphthalene, an organic compound commonly found in pesticides such as mothballs, sublimes easily because it is made of non-polar molecules that are held together only by van der Waals intermolecular forces. On cool surfaces, the naphthalene vapours will solidify to form needle-like crystals.

How can you detect naphthalene without seeing it?

How might you detect naphthalene in you sample if you cannot see it? Text Mothballs have a very strong and dis(nc(ve odor, so if any naphthalene was present in a sample, it would be possible to detect its presence by the smell.

Do naphthalene balls evaporate?

Naphthalene evaporates easily. These chemicals have some of the toxic properties of naphthalene. Some naphthalene will dissolve in water in rivers, lakes, or wells. Naphthalene in water is destroyed by bacteria or evaporates into the air.

Are naphthalene balls safe?

How should naphthalene be used safely? Moth balls containing naphthalene are generally safe for use around adults and older children, if used correctly and in the right quantity.

How long does mothball smell last?

four to six weeks

Can naphthalene balls keep rats away?

2 – Mothballs – Mothballs are actually useful in keeping both rats and mice away. They are poisonous not only to the rodent but also humans, therefore be careful when using Mothballs. This should push them out and keep them away as peppermint will instantly affect the lungs of the rat, killing them in the process.

Where do rats go during the day?

Roof Rats are primarily nocturnal, meaning that they sleep during the day and become active (seeking food and water) after dusk. They often live above ground (in attics or trees) and travel down at night to find food sources.