English

Differentiate between an atom and a molecule.

Advertisements
Advertisements

Question

Differentiate between an atom and a molecule.

Distinguish Between
Advertisements

Solution

  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
  Is there an error in this question or solution?
Chapter 1: Matter and Its Composition - Exercise

APPEARS IN

S.P. Singh Concise Chemistry [English] Class 7 ICSE
Chapter 1 Matter and Its Composition
Exercise | Q 6

RELATED QUESTIONS

The inter-molecular force is maximum in


Gases have definite volume but no definite shape.


Define matter.


State two characteristics of matter demonstrated by Brownian motion.


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 :


Explain why, osmosis can be considered to be a special kind of diffusion. Classify the following into

(i) osmosis, and (ii) diffusion  :

  1. swelling up of a raisin on keeping in water
  2. spreading of virus on sneezing
  3. earthworm dying on coming in contact with common salt
  4. shrinking of grapes kept in thick sugar syrup
  5. preserving of pickles in salt
  6. spreading of smell of cake being baked in the kitchen
  7. aquatic animals using oxygen dissolved in water during respiration

Name a non-metal which is a good conductor of electricity.


Name the property which enables metals to be drawn into wires.


Name a metal which can be easily cut with a knife.


Classify the following into elements, compounds and mixtures :

arble, Air, Gold, Brass, Sand, Diamond, Graphite, Petroleum, Common salt, Sea-water, Chalk


What are the three general classes of matter ? Give one example of each type.


Which of the following statements are true for pure substances ?

  1. pure substances contain only one kind of particles
  2. pure substances may be compounds or mixtures
  3. pure substances have the same composition throughout
  4. pure substances can be exemplified by all elements other than nickel

A solution contains 5.6 mL of alcohol mixed with 75 mL of water. Calculate the concentration of this solution.


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


Define the emulsion. Give one example.


What is meant by the concentration of a solution ?


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 ?


Which technique is used in a washing machine to squeeze out water from wet clothes while drying ?


Fill in the following blanks with suitable words :

The separation of liquids by fractional distillation is based on the difference in their .....................


Define the term matter.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×