When an incense stick (agarbatti) is lighted in one corner of a room, its fragrance spreads in the whole room quickly. Which characteristic of the particles of matter is illustrated by this observation?

Academic Chemistry NCERT Class 9

The spreading of the fragrance of an incense stick (agarbatti) lighted in a corner to the whole room indicates that particles of matter keep moving from higher to lower concentration.

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Updated on: 10-Oct-2022

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Explain the following :When an incense stick is lighted in the corner of a room, its fragrance spreads quickly in the entire room.
(a) When an incense stick (agarbatti) is lighted in one corner of a room, its fragrance quickly spreads in the entire room. Name the process involved in this.(b) A girl is cooking some food in the kitchen. The smell of food being cooked soon reaches her brother's room. Explain how the smell could have reached her brother's room.
When sugar is dissolved in water, there is no increase in the volume. Which characteristic of matter is illustrated by this observation?
Even two or three crystals of potassium permanganate can impart colour to a very large volume of water. Which characteristic of particles of matter is illustrated by this observation?
A piece of chalk can be broken into small particles by hammering but a piece of iron cannot be taken into small particles by hammering. Which characteristic of the particles of matter is illustrated by these observations?
The breadth of a room is twice its height, one half of its length and the volume of the room is $512$ cu. dm. Find its dimensions.
A bottle of perfume was opened in a room. The smell of its vapours spread in the entire room. Name the property of gases which is responsible for this behaviour of perfume vapours.
Which of the following statement is incorrect?(a) the particles of matter are very, very small(b) the particles of matter attract one another(c) the particles of some of the matter are moving constantly(d) the particles of all the matter have spaces between them
Fill in the following blanks with suitable words :(a) The best evidence that the particles of matter are constantly moving comes from the studies of ................. and ...................(b) The smell of perfume gradually spreads across a room due to .....................(c) Solid, liquid, and gas are the three ........................ of matter.(d) At room temperature, the forces of attraction between the particles of solid substances are ....................... then those which exist in the gaseous state.(e) The arrangement of particles is less ordered in the ...................... state. However, there is no order in the ..................... state.
(a) Name the three types of nerves which constitute the peripheral nervous system.(b) What is the difference between a reflex action and walking?(c) How do we detect the smell of an incense stick(agarbatti)?
What is the scientific name of particles which make up matter?
Which characteristic of the sound helps you to identify your friend by his voice while sitting with others in a dark room?
When a crystal of potassium permanganate is placed in a beaker, its purple colour spreads throughout the water. What does this observation tell us about the nature of potassium permanganate and water?
(a) Which of the nuclear particles is present in the same fixed number in the atoms of any particular element?(b) What do we call this number which is characteristic of a particular element?
A diver is able to cut through water in a swimming pool. Which property of matter does this observation show?

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