Because sometimes numbers get very big or very small.
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The uses of scientific notation in chemistry are to compute very large or very small numbers.
Scientific notation is useful because it helps to read values' significant figures (sigfigs). For example, the number: 6.02^(-10) is much easier to read than .000000000602. When dealing with especially large or small quantities, scientific notation makes it easier to understand how big or small the quantity is.
it is important to us to use scientific notation because if we use it we can read the numbers easily. Scientific notation is important because it make writing numbers easier. For example, you are contestant in a quiz bee and the examiner says,134000000000000x500000000000 or something like that you will lost time writing zeroes and you will also confused about it instead we can just write it in a scientific notation.
Molecular biology, quantum physics, cosmology and physical chemistry are four examples.
Round a number to a quantity of significant figures that you provide. Enter whole numbers, real numbers, scientific notation or e notation.