Question
What are ionic and molecular compounds? Give examples.

Answer

Atoms of different elements join together in definite proportions to form molecules of compounds. Compounds can be either ionic compounds or molecular compounds.
Ionic compounds are those compounds that contain charged species of metals and nonmetals.
The charged species are known as ions.
An ion is a charged particle and can be negatively or positively charged.
A negatively charged ion is called an anion and the positively charged ion is called cation.
Ionic compounds are formed when ionic bonds are formed between different elements through transfer of electrons.
Examples of ionic compounds - sodium chloride, calcium oxide.
Molecular compounds or covalent compounds are those compounds in which the elements share electrons via covalent bonds.
Examples - water, ammonia, carbon dioxide.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Compare all the proposed models of an atom given in this chapter.
How will you separate a mixture of iron filings, chalk powder an common salt?
Name the following compounds. Also write the symbols/ formulae of the ions present in them:
  1. CuSO4
  2. (NH4)2SO4
  3. Na2O
  4. Na2CO3
  5. CaCl2
How can you obtain pure water from a salt-water mixture (or salt-solution)? Draw a meat and labelled diagram of the apparatus you would use to obtain pure water from a salt-water mixture (or salt-solution).
An atom of an element X may be written as $^{9}_4\text{X} $
  1. What does the figure 9 indicate?
  2. What does the figure 4 indicate?
  3. What is the number of protons in atom X?
  4. What is the number of neutrons in atom X?
  5. What is the number of electrons in atom X?
  6. How many electrons are there in the outermost shell of an atom of element X?
  7. Write the symbol of ion formed by an element Z is 2, 8, 8.
Explain with examples

  1. Atomic number,
  2. Mass number,
  3. Isotopes,
  4. Isobars.

Give any two uses of isotopes.

State the law of constant proportions. Give one example to illustrate this law.
There is a large group of materials P which can be divided into three groups Q, R, and S on the basis of their properties. The substances belonging to group Q can be solids, liquids or gases. The solids belonging to group Q are usually electrical insulators. Most of the substances of group R are solids which are good conductors of electricity. The substances belonging to group S are neither insulators like Q nor good conductors like R. The properties of S are intermediate between those of Q and R.
  1. What could the group of materials P be?
  2. Name the substances Q. Give two examples of such substances.
  3. Name the substances R. Write two examples of such substances.
  4. Name the substances S. Give two examples of such substances.
  5. Out of Q, R and S, which substances are malleable and ductile?
How will you separate camphor, common salt and iron nails from their mixture?