CHEMISTRY - QUIZ 2: PRECISION, SIGNIFICANT FIGURES, AND SCIENTIFIC NOTATION

Express as an ordinary number. 6.983 x 10 ^4 =

69,830

Express as an ordinary number. 3.85 x 10 ^-3 =

0.00385

21. Give the number of significant figures in this number: 7.8 x 10¹²

2

13. Express in scientific notation, using the proper number of significant figures. (1.8×10−2)÷(9×102)=(1.8×10−2)÷(9×102)=_____

2 x 10 ^−5

The number 7.325 rounded off to three significant figures is

7.33

4. The unknown sample has a mass of: LINK TO IMAGE: https://assets.learnosity.com/organisations/328/4293a8be-29e8-4982-9336-51116e59c8a8/scale.gif

90.496 g

Give the number of significant figures in this number: 0.025

2

Give the number of significant figures in this number: 0.070

2

Express in scientific notation. Make sure your answer has the same number of significant figures as the starting value. 0.01325 = _____

1.325 x 10 ^-2

Give the number of significant figures in this number: 40

1

12. Express in scientific notation, using the proper number of significant figures. (6.0×104)×(3.1×10−1)=(6.0×104)×(3.1×10−1)= _____

1.9 x 1041.9 x 10 ^4

6. Which of the following could be a correct measurement using the full precision available for this balance? LINK TO IMAGE: https://assets.learnosity.com/organisations/328/4293a8be-29e8-4982-9336-51116e59c8a8/balance3.gif

24.00 g

Give the number of significant figures in this number: 0.115

3

Give the number of significant figures in this number: 2.110

4

Give the number of significant figures in this number: 2.115

4

Give the number of significant figures in this number: 40.00

4

Express in scientific notation. Make sure your answer has the same number of significant figures as the starting value. 61,103 = _____

6.1103 x 10 ^4

7. Can you measure tenths of a gram with confidence using this balance? LINK TO IMAGE: https://assets.learnosity.com/organisations/328/4293a8be-29e8-4982-9336-51116e59c8a8/balance3.gif

Yes