metals & non-metal class 10 scienceProperties of ionic compounds

-

Properties of ionic compounds:

1. Physical Nature: 

 Most of the ionic compounds are crystalline solids. Ionic compounds are relatively hard because of the strong electrostatic forces of attraction between the oppositely charged ions,
Positive & negative ions. These compounds are generally brittle & break into pieces when pressure or force applied.

2. Melting points & boiling points:

Ionic compounds have high melting points. This is because in the ionic compounds, the oppositely charged ions are held together by strong electrostatic forces of attraction.

3. Solubility:

Ionic compounds are generally soluble in water but insoluble in organic solvents like benzene, alcohol, ether, kerosene, petrol, chloroform etc.

4. Colour in the flame:

Most of the salts when brought into flame, impart characteristics colours to the flame.

5. Electrical conductivity:

The conduction of electricity through a solution involves the movement of charged particles. Ionic compounds, in the solid state, do not conduct electricity because the oppositely charged ions are held together by strong electrostatic forces of attraction & are not free to move due to their rigid structures.

6. Ionic reactions:

Since ionic compounds form free ions in the solution, thus, reaction between two ionic compounds means the reaction between their ions. Since oppositely charged ions combine very quickly, hence these reactions are quite rapid.

Comments

Post a Comment

Popular posts from this blog

Class 10 Science (Biology) Heredity and Evolution

-
Image
~ INTRODUCTION  In the last chapter you have studied how organisms reproduce to produce new individuals. The offsprings produced as a result of reproduction are similar to their parents as well as other individuals of the species. For example, man resembles man in body shape size etc. Similarly dogs resemble dogs,  cows resemble cows, and so on. Similarly the plant obtain from the seed of a mustard plant is similar to its parent. The offspring plant is similar to other mustard plants as well. But how is it that the offsprings are similar to other members of the species as well as to Parents. All this happens because of the presence of genes in parent/parents which are transferred to the next generation via  gametes or other means. These genes transfer the biological information of parents to offsprings which gives rise to various characteristics in the offspring thereby making them similar to parents or other members of species.  These differences in characteristics ...
Read more

National anthem, National song, National Bird , National animal, National game, national flower, first' president, first prime minister, Republic day , independence day.

-
Image
1. Who composes the national anthem? Ans. Rabindranath Tagore. 2. Who composes the national song? Ans. Bankim Chandra Chatterjee. 3. Which is national flower? Ans. Lotus. 4. Which national Animal? Ans. Tiger 🐅. 5. Which is national game? Ans. Hockey 🏒. 6.which is national song?  Ans. Vande maataram. 7. Which is national bird? Ans. Peacock 🦚. 8. Which is national fruit? Ans. Mango 🥭. 9. Who was first prime minister of India? Ans. Pandit Jawaharlal Nehru. 10. Who was first president of India? Ans. Dr. Rajendra Prasad. 11. When was Independence day celebrated? Ans. 15 August  every year.  12. When was Republic day celebrated? Ans. 26 January every year.
Read more

Chapter 7 control & coordination class 10th

-
Image
  Stimuli The changes in the environment or environmental factors to which the organisms respond and react are called stimuli. Coordination The working together of the various organs of an organism in a systematic manner so as to produce a proper reaction to the stimulus, us called coordination. System functions by the release of chemical messengers -- the hormones and is called endocrine system and the other works by the Conduction of nerve impulses like the Conduction of an electric current and is called nervous system. ANIMALS-- NERVOUS SYSTEM The system by which controls and coordinates all the activities of various parts in response to external and internal stimuli by the Conduction of nerve impulses is called nervous system. Sense organs Name of receptors     stimulus    location Photoreceptors             light             Eyes Phonoreceptors          ...
Read more