What naphthalene balls disappear with time without leaving any solid?

Answer: (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.

What is the process occurs in naphthalene ball disappears?

The process of conversion of matter from solid state directly to gaseous state and vice versa is called sublimation. Thus, naphthalene balls disappear with time without leaving any solid due to sublimation. -The second observation is: We can get the smell of perfumes sitting several meters away.

Why does naphthalene balls disappear with time in warm clothes?

Naphthalene or mothballs kept between clothes disappear over a period of time because naphthalene balls undergo sublimation and form naphthalene vapours, which disappear into the air.

Why we can get smell of perfume sitting several Metres away?

The kinetic energy of the perfume particles is very high and hence, the rate of diffusion will also be high as kinetic energy is directly proportional to rate of diffusion. In other words, the higher the temperature, the higher the kinetic energy. That is the reason we can smell the perfume sitting several meters away.

Why does the size of naphthalene ball decrease when left open?

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

Why does the size of naphthalene balls put in open keep on reducing with time Class 6?

There is a process of sublimation that occurs where the naphthalene changes its state from solid to gas directly without changing to liquid in the middle. This is the reason why the naphthalene balls keeps reducing its size if we keep it exposed to the air and atmosphere.

What happened to naphthalene ball when heated?

When heated at 80 °C, napthalene rapidly sublimes directly from a solid into a gas, eventually leaving nothing remaining in the crucible. On cool surfaces, the gaseous naphthalene will re-solidify to form needle-like crystals. This process is a method of purifying napthalene, and other substances which sublime.

What happened to naphthalene ball when place under the sun?

Naphthalene evaporates easily. That is why you can smell mothballs. In the air, moisture and sunlight make it break down, often within 1 day. These chemicals have some of the toxic properties of naphthalene.

Why naphthalene balls kept in the cupboard disappear if?

Naphthalene balls kept in stored clothes in our homes disappear over a period of time because they undergo sublimation and form naphthalene vapours, which disappear into the air.

Why naphthalene balls kept in stored Wollen and silk clothes?

Answer: Naphthalene is an organic compound which undergoes sublimation. — Naphthalene balls are kept in stored woolen and silk clothes to protect them from the attack of moths and other insects.

What is the reason for spreading of smell to long distance *?

When we increase temperature, the particles move with more speed and gain kinetic energy. Hot food has a very high temperature. Thus it spreads to a very large distance. So we can say that we smell hot food from a distance because of diffusion.

How can we smell a perfume from a long distance?

The process of diffusion is such that the particles from a high concentrated area will move to a less concentrated area. In this case, perfume particles concentrated to where it is applied will move to other less concentrated areas, which allows you to smell it from afar.

Why do naphthalene balls disappear at room temperature?

Naphthalene balls disappear because of the process of Sublimation at room temperature (a process by with solid directly changes to gas without going through the intermediate state of matter, liquid is called as Sublimation).

What is the sublimation of naphthalene?

Naphthalene undergoes sublimation easily, i.e., the change of state of naphthalene from solid to gas without the intervention of the liquid state. Thus, naphthalene balls keep forming naphthalene vapours that disappear into the air with time without leaving any solid.

Is it dangerous to sniff naphthalene balls?

Yes, sniffing naphthalene balls can be hazardous to health. Also, many people keep these balls in kitchen drawers where food items are kept. It is fine as long as the items are packed inside a container, but it can be dangerous if the items are kept unpacked as the ball vaporizes and mixes with contents like flour, etc.

How does naphthalene change from solid to gas?

Naphthalene undergoes sublimation, the change from a solid directly into a gas without going through the liquid phase, that is why it gets disappeared into air. Compounds with relatively high vapor pressures have low intermolecular forces and undergo sublimation.