मराठी
सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

Differentiate between an atom and a molecule.

Advertisements
Advertisements

प्रश्न

Differentiate between an atom and a molecule.

फरक स्पष्ट करा
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.
shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 1: Matter and Its Composition - Exercise

APPEARS IN

एस.पी. सिंह Concise Chemistry [English] Class 7 ICSE
पाठ 1 Matter and Its Composition
Exercise | Q 6

संबंधित प्रश्‍न

 Match the following

Column A Column B
(a) Molecules (i) Water boils
(b) 100° C (ii) Evaporation
(c) 0° C (iii) Changes from solid to gas
(d) At all temperatures (iv) Matter
(e) Camphor (v) Water freezes

 Name the terms for the change of vapour into a liquid.


Fill in the following blank with suitable words :

The best evidence that the particles of matter are constantly moving comes from the studies of ................. and ...................


Name a metal which is soft and a non-metal which is hard.


Name a liquid which can be classified as a pure substance and conducts electricity.


What happens when the temperature of a saturated sugar solution is increased ?


Which of the following is a sol ?

Shaving cream, Milk, Fog, Soap solution, Hairspray


Define the emulsion. Give one example.


Define solubility of a substance. How does it vary with temperature ?


Name the source from which nitrogen and oxygen are obtained on a large scale.


Name the process which can be used to purify an impure sample of copper sulphate.


How would you obtain sodium chloride from a mixture of sodium chloride and sulphur without using water ?


Explain how, impure copper sulphate can be purified by crystallisation.


The dyes present in fountain pen ink can be separated by the technique of :


One of the following does not undergo sublimation. This one is :


Tincture of iodine is a mixture of two materials X and Y. The material Y has a property that its solid form can be converted directly into vapours on heating by a process called Z.

  1. What could X be ?
  2. What could Y be ?
  3. Name the process Z.
  4. Which process would you use to recover both the components X and Y from tincture of iodine ?
  5. Which process can be used to recover only component Y from tincture of iodine ?

What's the solution?

We need to make a sherbet quickly for some guests. But we only have sugar candy in the house.


Asmita went to buy an earthen pot. There she saw many things kept for sale.
How did she identify what she needed?


The non S I and S I units of some physical  quantities are given in column A and column B respectively. Match the units belonging to the same physical quantity: 

(A) (B)
(a) degree celsius (i) kilogram
(b) centimetre (ii) pascal
(c) gram per centimetre cube (iii) metre
(d)  bar (iv) kelvin
(e) milligram (v)  kilogram per metre cube

Define the term matter.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×