SCIENCE-Inside Matter-Extra Questions

Inside Matter-Extra Questions

Q1: Who found the term ‘Anu’?

Ans An Indian sage Rishi Kanada .

Q2: Tell whether following substances are mixture, compound or molecule.

Water-Compound

Salt-Compound

Oxygen gas- molecule

Hydrogen gas-molecule

Iron with sand- mixture

Q3: Who was the chemist who put forward the system of using alphabetical letters for elements?

Ans: J.J. Berzelius

Q4: What is the latin name of Sodium?

Ans: Latin name of sodium is ‘natrium’ so first two letters of the latin name (Na) is used as a symbol of sodium.

Q5: What is Valency?

Ans: Capacity of an atom to combine chemically with atoms of the other elements is known as valency.

Q6: Give some examples to explain valency.

Ans: HCl- Valency of chlorine is 1.

H20- Valency of oxygen is 2.

NH3-Valency of nitrogen is 3.

Q7: What is a Radical?

Ans: Atoms or group of atoms that carry a positive or negative charge is known as radical. E.g. Na+ and Cl-

Q8:  How many atoms are present in oxygen or phosphorous molecule?

Ans: Oxygen-2 (O2)

Phosphorous-4 (P4)