Question 1

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

Accepted Answer

$$6.88 	imes 10$$^{12}$$

Question 2

A biologist measures the mass of a cell as $$0.0000000032$$ grams. How should this value be expressed in proper scientific notation?

Accepted Answer

$$3.2 	imes 10$$^{-9}$$

Question 3

Which statement about the coefficient in scientific notation is TRUE?

Accepted Answer

It must be at least 1 but less than 10.

Question 4

A chemist records a measurement as $$4.56 	imes 10^7$ meters. What does the exponent represent in this notation?

Accepted Answer

The number of places the decimal was moved to create the coefficient.

Question 5

Which of the following is NOT a correct scientific notation for the number $$0.00045$$?

Accepted Answer

$$45 	imes 10$$^{-5}$$

Question 6

A medical researcher notes a virus population of $$2.5 	imes 10^6$ in a sample. What is the value in standard decimal notation?

Accepted Answer

$$2,500,000$$

Question 7

Which of the following is the correct scientific notation for the speed of light, $$299,792,458 m/s$$?

Accepted Answer

$$2.99792458 	imes 10^8$

Question 8

Which of the following numbers is NOT written in proper scientific notation?

Accepted Answer

$$0.72 	imes 10$$^{-2}$$

Question 9

A sample contains $$5.00 	imes 10$$^{-7}$$ moles of a substance. Which of the following is the correct way to write this number in scientific notation?

Accepted Answer

$$5.00 	imes 10$$^{-7}$$

Question 10

Why is scientific notation commonly used in physiology and chemistry?

Accepted Answer

To express very large or very small numbers in a more manageable format.

Question 11

Convert $$0.000081 to $$scientific notation.

Accepted Answer

$$8.1 	imes 10$$^{-5}$$

Question 12

Which part of the scientific notation $$3.14 	imes 10^9$ is the base?

Accepted Answer

$$10$$

Question 13

A measurement is recorded as $$0.00000000056$$ meters. Which of the following is the correct scientific notation?

Accepted Answer

$$5.6 	imes 10$$^{-10}$$

Question 14

Which of the following is a key requirement for a number to be in proper scientific notation?

Accepted Answer

The base must be 10.

Question 15

A scientist writes $$12.3 	imes 10^5$ as a result. What is wrong with this scientific notation?

Accepted Answer

The coefficient is not between 1 and 10.

Question 16

Express $$4,200,000 in $$scientific notation.

Accepted Answer

$$4.2 	imes 10^6$

Question 17

Which of the following is the correct scientific notation for the Avogadro constant, $$602,000,000,000,000,000,000,000$$?

Accepted Answer

$$6.02 	imes 10$$^{23}$$

Question 18

A student writes $$0.45 	imes 10^3$ for the number 450$. What is wrong with this notation?

Accepted Answer

The coefficient is not between 1 and 10.

Question 19

Which of the following is the correct scientific notation for $$0.0000000078$$?

Accepted Answer

$$7.8 	imes 10$$^{-9}$$

Question 20

A laboratory sample contains $$3.00 	imes 10$$^{-4}$$ moles of a compound. Which of the following is the value in standard decimal notation?

Accepted Answer

$$0.0003$$

Scientific Notation in Chemistry: Format, Usage, and Identification

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