Class 11 Chemistry

Chapter 1 – Basic Concepts of Chemistry

Assignment 5

 

Q.1.       Express the following up to three significant places:

(a) the height of a man, 5 feet 9 inches in centimetres (1 inch = 2.54 cm)

(b) one millionth of one

(c) four thousand

(d) decimal equivalent of

Q.2.       Calculate to proper significant figures:

(a) 12.6 × 11.2

(b) 108 / 7.2

Q.3.       How many significant figures should be present in the answer of the following calculations ?

(i)

(ii) 5 × 5.364

(iii) 0.0125 + 0.7864 + 0.0215

Q.4.       Express the results of the following calculations to the appropriate number of significant figures:

(i)

(ii)

(iii) 0.582 + 324.65

(iv) 2.64 × 10³ + 3.27 × 10²

(v) 943 × 0.00345 + 101.

Q.5.       The mass of a piece of paper is 0.02 g and the mass of a solid substance and the piece of paper is 20.036 g. If the volume of the solid is 2.16 cm³, calculate the density of the substance up to proper number of significant digits.

Q.6.       Express the result of following expressions to proper number of significant figures:

(i) 144.3 m² + (2.54 m × 8.4 m)

(ii) (4.05 × 10² mL) – (0.0225 × 10² mL)

(iii) (3.50 × 10² cm) (4.00 × 10⁶ cm)

 

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