chem ch 1

Question 1

Significant figures:

Answer 1

Significant figures are the number of meaningful digits with certainty. The significant figures
are the number of digits used to express the measurement of the physical quantity such that the last
digit in it is doubtful and the rest all digits are accurate.

Question 2

Scientific Notation

Answer 2

it is an exponent notation, in which any number can be represented in the form N ×
10n
. (Where n is an exponent having + ve or - ve values and N can vary from 1 to 10).
Eg: We can write 232.508 as 2.32508 x102

and 0.00016 as 1.6 x 10–4

in scientific notation.