Express 0.00212 in scientific notation.

2.12 × 10-3

Explanation:

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To convert 0.00212 into scientific notation, follow these steps:

Move the decimal 3 times to right in the number so that the resulting number, m = 2.12, is greater than or equal to 1 but less than 10

Since we moved the decimal to the right the exponent n is negative

n = -3

Write in the scientific notation form, m × 10n

= 2.12 × 10-3

Therefore, the decimal number 0.00212 written in scientific notation is 2.12 × 10-3 and it has 3 significant figures.

pure substance: iron,copper

impure substance: water,charcoal