Читать книгу Foundations of Chemistry - Philippa B. Cranwell - Страница 22

1 To write 675 in scientific notation, we must move the decimal point (currently after the 5) two spaces to the left (i.e. divide by 100) and then multiply the remaining number by 100 or 102.675 becomes 6.75 × 102.

2  To write 1 000 000 in scientific notation, we must move the decimal point (currently after the last 0) six spaces to the left (i.e. divide by 1 000 000) and then multiply the remaining number by 1 000 000 or 106.1 000 000 becomes 1 × 106.

3 To write 0.98 in scientific notation, we must move the decimal point one space to the right (i.e. multiply by 10) and then multiply the remaining number by 0.1 or 10−1 (i.e. divide by 10).So 0.98 becomes 9.8 × 10−1.

4 To write 0.00355 in scientific notation, we must move the decimal point three spaces to the right (i.e. multiply by 1 000) and then multiply the remaining number by 0.001 or 10−3 (i.e. divide by 1 000).So 0.00355 becomes 3.55 × 10−3.