Scientists, Mathematicians and Engineers generally use scientific notation. In particular, those scientists and engineers who have to measure distances, weights or volumes of a very large or very small size. Astronomers, for example, may measure the distance of stars that are billions of billions of light years away. Wouldn't you rather write 4.9 * 1015 instead of 4,900,000,000,000,000?
The uses of scientific notation in chemistry are to compute very large or very small numbers.
They don't usually.
It is not. "Scientific notation" uses a base of 10. The correct notation would be 1.251 x 10^8
Scientific notation gives a compact notation, which is especially useful for writing down - and doing calculations with - very large, and very small, numbers.
The practical uses of scientific notation are to compute very large or very small numbers.
Because it uses fewer digits as for example 9,000,000,000,000,000 in scientific notation is 9.0*10^15
Scientific notation takes one digit before the decimal point and uses multiples of 10 to represent the rest of the digits. In this case, scientific notation is not really practical. The answer is 1.003 x 101
Dealing with numbers that are very large or very small.
It is 8.9*10^-5 in scientific notation
It is "(scientific notation)".
This number in scientific notation is 9.8x10-5.
The scientific notation for 89,450 is: 8.945 × 104