Chem. Ch. 3 Review

Define

100

fraction equal to 1, contains both original and equivalent

conversion factor

200

subdivided into measurement units

graduated

300

displays measurement using a pointer on a scale

analog

400

units that come from basic SI units

derived

500

device made for purpose of refining, extending, or substituting for human senses when measuring

instrument

Accurate, Precise

100

how close to target 

accuracy

200

how repeatable

precision

300

helps keep measurement honest

precision

400

Measured: 3.12 , 5.33 , 4.2

Actual: 2.08

no accurate or precise

500

Measured: 8.34 , 8.28 , 8.4

Actual: 8.30

Accurate and precise

Convert

100

3.21 g = _ mg

3210 mg

200

89 km = cm

8,900,000 cm

300

13 dm = __ m

1.3 m

400

1.03 x 10³ g= ___ kg

1.03 kg

500

8.97 x 10⁷ L = ___ mL

8.97 x 10¹⁰ mL

Sig Figs

100

40 870 L

4 SDs

200

84.800 g

5 SDs

300

Round to 1 SD:

0.0892

0.09

400

30.01 m

4 SDs

500

0.00908320

6 SDs

Calculate

100

45.61 + 3.25 + 10.205

59.07

200

10.3 x 6.1

62.83--> 63

300

108.9 - 74.003

34.897 --> 34.9

400

% error: 

actual-2.56 g

observed - 3.08 g

52%

500

density = mass/volume

319 g (mass), 7.42 g/mL (density)

42.99 mL

(SD: 43.0)