$6.8 \times 10^{4}$\ \text{kg}$

Question 1

Which of the following is the correct scientific notation for the number 0.000 008?

Accepted Answer

$8 	imes 10^{-6}$

Question 2

A typical human scalp has about 100,000 hairs. Which of the following correctly expresses this number in scientific notation?

Accepted Answer

$1 	imes 10^{5}$

Question 3

Which of the following statements about scientific notation is TRUE?

Accepted Answer

The coefficient must be at least 1 but less than 10.

Question 4

Convert the standard number 0.000 021 to scientific notation.

Accepted Answer

$2.1 	imes 10^{-5}$

Question 5

A chickenpox virus has a diameter of 0.000 000 3 cm. What is this value in scientific notation?

Accepted Answer

$3 	imes 10^{-7}$\ 	ext{cm}$

Question 6

Which of the following is the correct scientific notation for the mass of a human, given as 68,000 kg?

Accepted Answer

$6.8 	imes 10^{4}$\ 	ext{kg}$

Question 7

A calculator displays the number 5.2E-04. What is this number in standard notation?

Accepted Answer

$0.00052$

Question 8

If the diameter of the Earth is $1.28 	imes 10^{7}$ m, how would you write this number in standard notation?

Accepted Answer

$12,800,000$\ 	ext{m}$

Question 9

Which of the following is NOT a correct way to write a number in scientific notation?

Accepted Answer

$0.8 	imes 10^{6}$

Question 10

A laboratory sample has a mass of $7.2 	imes 10^{6}$ g. What is this mass in standard notation?

Accepted Answer

$7,200,000$\ 	ext{g}$

Question 11

A student enters 0.000 64 into a calculator and wants to express it in scientific notation. What is the correct answer?

Accepted Answer

$6.4 	imes 10^{-4}$

Question 12

Which of the following best describes the process for converting a standard number to scientific notation?

Accepted Answer

Move the decimal point to create a coefficient between 1 and 10, then multiply by 10 raised to the number of places moved.

Question 13

A calculator displays 1.52E2. What is the value in standard notation?

Accepted Answer

$152$

Question 14

Which of the following numbers is written correctly in scientific notation?

Accepted Answer

$4.5 	imes 10^{3}$

Question 15

A scientist measures the width of a cell as $8 	imes 10^{-6}$ m. If another cell is 10 times wider, what is its width in scientific notation?

Accepted Answer

$8 	imes 10^{-5}$\ 	ext{m}$

Question 16

A calculator displays 7.2E7. What is the value in standard notation?

Accepted Answer

$72,000,000$

Question 17

Which of the following is the correct scientific notation for the number 0.000 000 86?

Accepted Answer

$8.6 	imes 10^{-7}$

Question 18

A student writes $24 	imes 10^{2}$ as the scientific notation for 2400. What is the error in this notation?

Accepted Answer

The coefficient should be between 1 and 10; it should be $2.4 	imes 10^{3}$.

Scientific Notation in Chemistry: Writing and Interpreting Numbers

Study Guide - Practice Questions