Assignment – 1 

Some Basic Concepts of Chemistry

Q1. How many significant figures are there in (i) 3.070 and (ii) 0.0025?   
 
Q 2. How many significant figures are present in the answer of the following calculation  
0.0125 + 0.8250 + 0.025
Q3. The density of vanadium is 5.96 g cm3. Express this in SI unit.

Q4. The body temperature of a normal healthy person is 37C. Calculate its value in 0F.

Q5. At what temperature will both the Celsius and Fahrenheit scales read the same value?

Q6. Express the following in the scientific notation: (i) 0.0048 (ii) 234,000

Q7. Given the numbers: 161 cm, 0.161 cm, 0.0161 cm. Write the number of significant figures for these three numbers.

Q8. Read the following and choose the incorrect statements.
(i) Both weight and mass are same quantities used for measurement of amount of matter present in a substance
(ii) Mass and weight of a substance vary from one place to another due to change in gravity.
(iii) ST unit of mass is kilogram and while SI unit of weight is gram.
(a) (i) and (iii)                              (b) (ii) and (iii)
(c) (i) and (ii)                               (d) All of these

Q9. A student performs a titration with different burettes and finds titre values of 25.2 mL, 25.25 mL and 25.0 mL the number of significant figures in the average titre value is  
a) 1                                   b) 3 
c) 2                                   d) 4

Q10. What will be the answer of 77.32-6.3? 
a) 71.02                            b) 71.0         
c) 71.2                              d) 71.1