The atomic mass may be defined as the average relative mass of an atom of the element as compared to an atom of carbon (carbon-12) taken as 12. It is approximately equivalent to the mass number of an atom.

Correct the symbols and formulae of the following: (i) KCO 3 (ii) CDI 2 (iii) CR (iv) AL(PO 4 ) 3 (v) CuCl 3 (vi) Fe 2

(i) K has charge + 1 and CO 3 has charge - 2 , therefore the formula is K 2 CO 3 . (ii) CdI 2 is the correct formula. It is cadmium iodide. (iii) CR is wrong, Cr represents chromium. (iv) Al ( PO 4 ) is the correct formula of Aluminium phosphate because Al has + 3 charge and PO 4 has - 3 charge. (v) Cu has + 2 charge and Cl has - 1 charge. The formula is CuCl 2 (vi) Fe is the symbol of iron.

E M B I B E

Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 3 - Atoms and Molecules>TEST YOURSELF

Dr. S P Jauhar and R Jauhar Solutions for Chapter: Atoms and Molecules, Exercise 2: TEST YOURSELF

Author:Dr. S P Jauhar & R Jauhar

Dr. S P Jauhar Chemistry Solutions for Exercise - Dr. S P Jauhar and R Jauhar Solutions for Chapter: Atoms and Molecules, Exercise 2: TEST YOURSELF

Attempt the free practice questions on Chapter 3: Atoms and Molecules, Exercise 2: TEST YOURSELF with hints and solutions to strengthen your understanding. Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX solutions are prepared by Experienced Embibe Experts.

Questions from Dr. S P Jauhar and R Jauhar Solutions for Chapter: Atoms and Molecules, Exercise 2: TEST YOURSELF with Hints & Solutions

EASY

9th CBSE

IMPORTANT

Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 3 - Atoms and Molecules>TEST YOURSELF>Q 12

Define: Atomic mass

EASY

9th CBSE

IMPORTANT

Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 3 - Atoms and Molecules>TEST YOURSELF>Q 12

Define: Gram atomic mass

EASY

9th CBSE

IMPORTANT

Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 3 - Atoms and Molecules>TEST YOURSELF>Q 12

Define: Molecular mass

EASY

9th CBSE

IMPORTANT

Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 3 - Atoms and Molecules>TEST YOURSELF>Q 12

Define: Gram molecular mass

MEDIUM

9th CBSE

IMPORTANT

Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 3 - Atoms and Molecules>TEST YOURSELF>Q 13

The formula of radium bromide is ${RaBr}_{2}$ . Write the formulae of the following compounds.
(i) Radium Sulphite
(ii) Radium phosphate
(iii) Radium oxide

MEDIUM

9th CBSE

IMPORTANT

Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 3 - Atoms and Molecules>TEST YOURSELF>Q 14

Explain the term 'mole' and Avogadro's number. How are they related?

HARD

9th CBSE

IMPORTANT

Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 3 - Atoms and Molecules>TEST YOURSELF>Q 14

Why is it not correct to speak a molecule of sodium chloride?

MEDIUM

9th CBSE