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CHEMISTRY CHAPTER 4 PROBLEM SOLVING IN CHEMISTRYPowerPoint Presentation

CHEMISTRY CHAPTER 4 PROBLEM SOLVING IN CHEMISTRY

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CHEMISTRYCHAPTER 4PROBLEM SOLVING IN CHEMISTRY

Steps for solving word problems:

1. Find unknown

2. Find knowns

3. Plan solution

4. Calculate

5. Check

A conversion factor is a ratio with a value of one.Ex. 1 ft = 12 inches 1.00g water = 1 mL water 100 cm = 1m

Dimensional Analysis is also called the “factor label method” of problem solving.

How many seconds are there in 2.5 years?

2.5 years 365 days

1 year

2.5 years 365 days 24 hours

1 year 1 day

2.5 years 365 days 24 hours 60 min

1 year 1 day 1 hour

2.5 years 365 days 24 hours 60 min 60 s

1 year 1 day 1 hour 1 min

= 7.9 x 107 s

A clock gains 0.25 seconds per minute. How many seconds will it gain in exactly 180 days?

180 days 24 hr

1 day

180 days 24 hr 60 min

1 day 1 hr

180 days 24 hr 60 min 0.25s gained

1 day 1 hr 1 min

=6.48 x 104 s gained

= 6.5 x 104 s gained

A fictitious unit of length called the “zither” is defined by the relationship 7.50 cm = 1.00 zither. How many zithers are in a 100.0 meter distance?

100.0m 100cm

1 m

100.0m 100cm 1.00 zither

1 m 7.50 cm

= 1333 zithers

= 1330 zithers

What is the mass of a 35.0 defined by the relationship 7.50 cm = 1.00 zither. How many zithers are in a 100.0 meter distance?mL sample of concentrated sulfuric acid (density 1.84g/mL)?

35.0 mL 1.84g

1 mL

= 64.4 g

Nolan Ryan threw a fastball 100.8 mi/h. Calculate this velocity in m/s. 1 mi = 1.6093 km.

100.8 mi

1 h

100.8 mi 1.6093 km

1 h 1 mi.

100.8 mi 1.6093 km 1000 m

1 h 1 mi. 1 km

100.8 mi 1.6093 km 1000 m 1hr

1 h 1 mi. 1 km 60 min

100.8 mi 1.6093 km 1000 m 1hr 1 min

1 h 1 mi. 1 km 60 min 60 s

45.06 m/s

The density of copper is 8.96g/cm velocity in m/s. 1 mi = 1.6093 km.3 at 25oC. Determine its density in kg/m3.

8.96g

1 cm3

8.96g 1kg

1 cm3 1000g

8.96g 1kg (100)3cm3

1 cm3 1000g 1m3

=8960 kg/m3 or 8.96 x 103 kg/m3

Copper makes up 1.1 x 10 velocity in m/s. 1 mi = 1.6093 km.-4 percent by mass of a normal healthy human. How many grams of copper would be found in the body of a person weighing 150 lb? (1.0 kg = 2.2 lb)

150 lb man 1.0kg man

2.2 lb man

150 lb man 1.0kg man 1000g man

2.2 lb man 1 kg man

150 lb man 1.0kg man 1000g man 1.1 x 10-4g Cu

2.2 lb man 1 kg man 100g man

= 7.5 x 10-2 g Cu or 0.075g Cu

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