Week 1: Chapter 2

Which of the following measurements contain three significant figures.

0.00100, 1.00 x 10^-3, and 395

Rank these values according to magnitude: 8.2 x 10-2, 9.9 x 10^2, 2.182 x 10^6, 3.39 x 10^-5

Greatest---> Least: 2.182 x 10^6, 9.9 x 10^2, 8.2 x 10^-2, 3.39 x 10^-5

Round each number to three significant figures. a. 0.036549 b. 1044.987 c. 4.00007

a. 0.0365 b. 1040 c. 4.00

Write the following numbers in scientific notation. a. 1051 b. 0.00053

a. 1.051 x 10^3 b. 5.3 x 10^-4

Identify the power of ten that defines each of these prefixes. a. nano- b. kilo- c. centi- d. micro- e. milli- f. mega-

a. 10^-9 b. 10^3 c. 10^-2 d. 10^-6 e. 10^-3 f. 10^6

To how many significant figures should each answer be rounded? a. (6.626 x 10^-34 J*s) (2.9979 x 10^8 m/s) / 4.490 x 10^-7 m =4.42072472160 x 10^-19 J (unrounded) b. (6.022 x 10^23 atoms/mol)(0.773 g) / 20.18 g/mol = 2.307 x 10^22 atoms (unrounded)

a. 4 significant figures b. 3 significant figures

Write the following numbers in scientific notation. a. 673.5 b. 0.034

a. 6.735 x 10^2 b. 3.4 x 10^-2

Write the following numbers in standard notation, maintaining the same number of significant figures. a. 6.104 x 10^2 b. 9.5 x 10^-3

a. 610.4 b. 0.0095

To what decimal place should each answer be rounded? How many significant figures does the rounded answer have? a. 9 cm + 2.8cm =11.8 cm (unrounded) b. 0.135 atm+ 0.6 atm = 0.735 atm (unrounded)

a. after rounding the number should be reported to the ones place and thus has 2 significant figures b. after rounding the number should be reported to the tenths place and thus has 1 significant figures

Give the SI base unit of each of these quantities. Enter the abbreviation rather than the name of the unit. a. Mass b. length c. time d. temperature

a. kg b. m c. s d. K

Label each of the following digits as a significant or not significant. 0.03090

first two 0 (0.0) =not significant 3090 = significant