What is the standard scientific notation?
In normalized scientific notation all numbers are written in the form a x 10^b (a times ten raised to the power of b) where a is a nonzero single-digit integer and b is an integer.
Do scientist use scientific notation to solve science problems?
Sometimes.
Scientific notation is used to express very small or very large numbers. If the problem does not involve any such numbers then there is no need for scientific notation.