Advertisements
Advertisements
प्रश्न
Differentiate between an atom and a molecule.
Advertisements
उत्तर
| Atom | Molecule | ||
| 1. | Atoms are described as the smallest particles of an element that do not exist freely in nature but participate directly in chemical reactions. | 1. | A molecule consists of bound atoms that exist freely in nature but do not directly participate in chemical combinations. |
| 2. | The symbol of an element represents its atom. For example, the symbol H represents a hydrogen atom. | 2. | The molecular formula represents any substance's molecule. For example, the oxygen molecule is represented as O2. |
| 3. | An atom is made up of subatomic particles i.e., electrons, protons, and neutrons. | 3. | Molecules are made up of two or more atoms, which either be from the same or different elements. |
APPEARS IN
संबंधित प्रश्न
Fill in the blank :
The state of matter with definite volume and definite shape is called______
Name the terms for the change of vapour into a liquid.
Name the property which allows metals to be hammered into thin sheets.
What is the other name for impure substances ? Give two examples of impure substances.
How would you confirm that a colourless liquid given to your is pure water ?
Name a metal which has a low melting point.
What are the three general classes of matter ? Give one example of each type.
Which of the following is not an element ?
“Is malleable and ductile” best describes :
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.
Fill in the following blank :
A colloid is a ..............mixture and its components can be separated by the technique known as ...............
How would you prepare a saturated solution of sodium chloride in water at 25°C ? What will happen if this solution is cooled to 10°C ?
What is the difference between colloids and suspensions ?
Which technique is used in a washing machine to squeeze out water from wet clothes while drying ?
How is cream separated from milk ?
How can you obtain pure water from a salt-water mixture (or salt-solution) ? Draw a neat and labelled diagram of the apparatus you would use to obtain pure water from a salt-water mixture (or salt-solution).
A standard sheet of paper is about ______ of atoms thick
Which of the following are homogeneous in nature?
(i) ice
(ii) wood
(iii) soil
(iv) air
______ is so hard that it can scratch glass.
Which statement is not correct for a mixture
