Chemistry Ch 3 Review

Significant Figures

100

How many significant figures does this number have?10400

3 (104 only)

200

Rewrite the following so that the zero is not significant 13450.

0.1345 or 13450

300

How many significant figures are in the following number? 0.007500

4 (75 and the 0's after it)

400

How many significant figures are in the following number? 1.008

4 (All 0’s between non zeros are significant)

500

Round this number to contain 3 significant figures. 12,345,678

12,300,000

Metric Conversions

100

Convert 100mg to g

0.100 g

200

Convert 20 kg to g

20, 000 g

300

Convert 30 cm to mm

300 mm

400

Convert 60 mL to L

0.06 L

500

Convert 1 kg to mg

1,000,000 mg

Dimensional Analysis

100

Convert 5 m/s to km/s

0.005 km/s

200

Convert density of 0.00945 g/L to g/mL

9.45 g/mL

300

Convert 40 yds/5sec to feet/sec

24 ft/sec

400

Convert 15 breaths/min to breaths/ day

21,600 breaths/ day

500

Express the speed of light, 3.0x10¹⁰ cm/s in km/hr

1.1x10⁹ km/hr

Scientific Notation

100

Change to scientific notation

59,000

5.9x10⁴

200

Change to scientific notation

0.0000768

7.68x10^-5

300

Simplify. Give answer in scientific notation.

6.02x10²³ + 8.65x10²³

1.47x10²⁴

400

Simplify. Given answer in scientific notation. 

(5.4x10⁴) (2.2x10⁷)

         4.5x10⁵

2.6x10⁶

500

(6.02 x 10²³) (–5.11 x 10^–27)

       –8.23 x 10⁵

3.74x10^-9

Density Speed

100

The density  of mercury metal is 13.6 g/mL. What is the mass of 3.55 mL of the metal?

48.3 g

200

A particle moves through a gas at a speed of 15 km/s. How far will it move in 5.5 s?

83 km

300

Find the density of a substance that has a mass of 100. g and volume of 50 mL

2 g/mL

400

Find the speed of an object in m/sec that travels 25 m in 400 sec

0.06 m/s

500

Convert a speed of 73.5 km/hr to it’s equivalent in m/s

20.4 m/s