Advertisements
Advertisements
प्रश्न
What are molecules ?
Advertisements
उत्तर
Molecules are made of atoms. Molecules exhibit the properties of that kind of matter and has independent exi stance.
APPEARS IN
संबंधित प्रश्न
Name the processes involved in two cases.
Name the terms for the particles of matter which may or may not have independent existence.
When a crystal of potassium permanganate is placed at the bottom of water in a beaker, the water in the whole beaker turns purple on its own, even without stirring. This is an example of :
Name one element, one compound and one mixture.
Fill in the following blanks with suitable words :
An element is made up of only one kind of ........
Classify the following into elements, compounds and mixtures :
arble, Air, Gold, Brass, Sand, Diamond, Graphite, Petroleum, Common salt, Sea-water, Chalk
The property/properties which enable copper metal to be used for making electric wires is/are :
There are three substances X, Y and Z. The substance X does not have a fixed melting point or boiling point and it still shows the individual properties of its constituents. The substance Y is a pure substance which occurs in nature as such. The substance Y has a fixed melting point and boiling point but it cannot be broken down into simpler substances by any chemical means. The substance Z is also a pure substance whose properties are entirely different from those of its constituents. The substance Z can, however, be divided by electrolysis into two substances which belong to the same class of substances as Y.
- What type of substance could X be ? Name one substance like X.
- What type of substance could Y be ? Name one substance like Y.
- What type of substance could Z be ? Name one substance like Z.
- Which process involves absorption or release of an appreciable amount of energy : formation of substance X or formation of substance Z ?
- Name the three groups into which all the substances like Y are divided on the basis of their properties.
Out of a colloid, solution and a suspension :
which one has the smallest particles ?
Out of a colloid, solution and a suspension :
which one has the largest particles ?
Which of the two will scatter light : soap solution or sugar solution ? Why ?
Define solvent.
One of the following does not show Tyndall effect. This one is :
How will you separate a mixture containing sand and sugar ?
How will you separate camphor, common salt and iron nails from their mixture ?
The correct increasing order of the boiling points of liquid oxygen, liquid argon and liquid nitrogen present in liquid air is :
Wipe the board with a duster and then tap the duster against the table. What do you see?
State whether true or false. If false, correct the statement.
Oil and water are immiscible with each other.
Intermolecular space is maximum in ______.
Higher the temperature, the higher the kinetic energy of particles.
