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CHEMISTRY CHAPTER 4 PROBLEM SOLVING IN CHEMISTRYPowerPoint Presentation

CHEMISTRY CHAPTER 4 PROBLEM SOLVING IN CHEMISTRY

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CHEMISTRY CHAPTER 4 PROBLEM SOLVING IN CHEMISTRY

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1. Find unknown

2. Find knowns

3. Plan solution

4. Calculate

5. Check

52.5 m x 1000 mm = 5.25 x 104 mm

1m

or 52.5m 1000mm = 5.25 x 104 mm

1m

73.2 km 1000m

1 km

73.2 km 1000m 100 cm

1 km 1m

= 7.32 x 106 cm

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

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

35.0 mL 1.84g

1 mL

= 64.4 g

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

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 10-4 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