This is a collection of ten chemistry test questions with answers dealing with significant figures and scientific notation. The answers are at the bottom of the page.

Significant figures are used to keep track of uncertainty in measurements for experiments and calculations. They are a means of recording error. Scientific notation is used to express very large and very small numbers. This shorthand notation makes it easier to write numbers and also allows for accurate calculator operations.

### Question 1

How many significant figures are in the following values?

a. 4.02 x 10^{-9}

b. 0.008320

c. 6 x 10^{5}

d. 100.0

### Question 2

a. 1200.0

b. 8.00

c. 22.76 x 10

^{-3}

d. 731.2204

### Question 3

2.63 x 10

^{-6}or 0.0000026

### Question 4

a. with 1 significant figure

b. with 2 significant figures

c. with 3 significant figures

d. with 5 significant figures

### Question 5

Express 0.0003711 in scientific notation.

a. with 1 significant figure

b. with 2 significant figures

c. with 3 significant figures

d. with 4 significant figures

### Question 6

22.81 + 2.2457

### Question 7

815.991 x 324.6

### Question 8

3.2215 + 1.67 + 2.3

### Question 9

8.442 - 8.429

### Question 10

27/3.45

### Answers

2. a. 5 b. 3 c. 4 d. 7

3. 2.63 x 10

^{-6}

4. a. 5 x 10

^{6}b. 4.5 x 10

^{6}c. 4.61 x 10

^{6}d. 4.6100 x 10

^{6}

5. a. 4 x 10

^{-4}b. 3.7 x 10

^{-4}c. 3.71 x 10

^{-4}d. 3.711 x 10

^{-4}

6. 25.06

7. 2.649 x 10

^{5}

8. 7.2

9. 0.013

10. 7.8