Students will learn about the conversion factors and Dimensional Analysis.

1. chemistry
Slide
of 43

2. 3.3
3
Conversion Problems
Because each country’s
currency compares differently
with the U.S. dollar, knowing
how to convert currency units
correctly is very important.
Conversion problems are
readily solved by a problemsolving approach called
dimensional analysis.
Slide
of 43
© Copyright Pearson Prentice Hall

3. 3.3
Conversion Problems
>
Conversion Factors
Conversion Factors
What happens when a measurement
is multiplied by a conversion factor?
Slide
of 43
© Copyright Pearson Prentice Hall

4. 3.3
Conversion Problems
>
Conversion Factors
A conversion factor is a ratio of equivalent
measurements.
The ratios 100 cm/1 m and 1 m/100 cm are
examples of conversion factors.
Slide
of 43
© Copyright Pearson Prentice Hall

5. Conversion Problems
>
Conversion Factors
Animation 3
Learn how to select the proper conversion
factor and how to use it.
Slide
of 43
© Copyright Pearson Prentice Hall

6. 3.3
Conversion Problems
>
Conversion Factors
When a measurement is multiplied by
a conversion factor, the numerical
value is generally changed, but the
actual size of the quantity measured
remains the same.
Slide
of 43
© Copyright Pearson Prentice Hall

7. 3.3
Conversion Problems
>
Conversion Factors
The scale of the micrograph is in nanometers.
Using the relationship 109 nm = 1 m, you can write
the following conversion factors.
Slide
of 43
© Copyright Pearson Prentice Hall

8. 3.3
Conversion Problems
>
Dimensional Analysis
Dimensional Analysis
Why is dimensional analysis useful?
Slide
of 43
© Copyright Pearson Prentice Hall

9. 3.3
Conversion Problems
>
Dimensional Analysis
Dimensional analysis is a way to analyze and
solve problems using the units, or dimensions,
of the measurements.
Dimensional analysis provides you
with an alternative approach to
problem solving.
Slide
of 43
© Copyright Pearson Prentice Hall

10. SAMPLE PROBLEM 3.5
Slide
of 43
© Copyright Pearson Prentice Hall

11. SAMPLE PROBLEM 3.5
Slide
of 43
© Copyright Pearson Prentice Hall

12. SAMPLE PROBLEM 3.5
Slide
of 43
© Copyright Pearson Prentice Hall

13. SAMPLE PROBLEM 3.5
Slide
of 43
© Copyright Pearson Prentice Hall

14. Practice Problems for Sample Problem 3.5
Problem Solving 3.29 Solve
Problem 29 with the help of an
interactive guided tutorial.
Slide
of 43
© Copyright Pearson Prentice Hall

15. SAMPLE PROBLEM 3.6
Slide
of 43
© Copyright Pearson Prentice Hall

16. SAMPLE PROBLEM 3.6
Slide
of 43
© Copyright Pearson Prentice Hall

17. SAMPLE PROBLEM 3.6
Slide
of 43
© Copyright Pearson Prentice Hall

18. SAMPLE PROBLEM 3.6
Slide
of 43
© Copyright Pearson Prentice Hall

19. Practice Problems for Sample Problem 3.6
For Sample Problem 3.6
Problem Solving 3.30 Solve
Problem 30 with the help of an
interactive guided tutorial.
Slide
of 43
© Copyright Pearson Prentice Hall

20. 3.3
Conversion Problems
>
Converting Between Units
Converting Between Units
What types of problems are easily
solved by using dimensional
analysis?
Slide
of 43
© Copyright Pearson Prentice Hall

21. 3.3
Conversion Problems
>
Converting Between Units
Problems in which a measurement
with one unit is converted to an
equivalent measurement with another
unit are easily solved using
dimensional analysis.
Slide
of 43
© Copyright Pearson Prentice Hall

22. SAMPLE PROBLEM 3.7
Slide
of 43
© Copyright Pearson Prentice Hall

23. SAMPLE PROBLEM 3.7
Slide
of 43
© Copyright Pearson Prentice Hall

24. SAMPLE PROBLEM 3.7
Slide
of 43
© Copyright Pearson Prentice Hall

25. SAMPLE PROBLEM 3.7
Slide
of 43
© Copyright Pearson Prentice Hall

26. Practice Problems for Sample Problem 3.7
Problem Solving 3.33 Solve
Problem 33 with the help of an
interactive guided tutorial.
Slide
of 43
© Copyright Pearson Prentice Hall

27. 3.3
Conversion Problems
>
Converting Between Units
Multistep Problems
When converting between units, it is often
necessary to use more than one conversion
factor. Sample problem 3.8 illustrates the use of
multiple conversion factors.
Slide
of 43
© Copyright Pearson Prentice Hall

28. SAMPLE PROBLEM 3.8
Slide
of 43
© Copyright Pearson Prentice Hall

29. SAMPLE PROBLEM 3.8
Slide
of 43
© Copyright Pearson Prentice Hall

30. SAMPLE PROBLEM 3.8
Slide
of 43
© Copyright Pearson Prentice Hall

31. SAMPLE PROBLEM 3.8
Slide
of 43
© Copyright Pearson Prentice Hall

32. Practice Problems for Sample Problem 3.8
Problem Solving 3.35 Solve
Problem 35 with the help of an
interactive guided tutorial.
Slide
of 43
© Copyright Pearson Prentice Hall

33. 3.3
Conversion Problems
>
Converting Between Units
Converting Complex Units
Many common measurements are expressed
as a ratio of two units. If you use dimensional
analysis, converting these complex units is just
as easy as converting single units. It will just
take multiple steps to arrive at an answer.
Slide
of 43
© Copyright Pearson Prentice Hall

34. SAMPLE PROBLEM 3.9
Slide
of 43
© Copyright Pearson Prentice Hall

35. SAMPLE PROBLEM 3.9
Slide
of 43
© Copyright Pearson Prentice Hall

36. SAMPLE PROBLEM 3.9
Slide
of 43
© Copyright Pearson Prentice Hall

37. SAMPLE PROBLEM 3.9
Slide
of 43
© Copyright Pearson Prentice Hall

38. Practice Problems for Sample Problem 3.9
Problem-Solving 3.37 Solve
Problem 37 with the help of an
interactive guided tutorial.
Slide
of 43
© Copyright Pearson Prentice Hall

39. Section Assessment
Assess students’ understanding
of the concepts in Section 3.3
Continue to:
-or-
Launch:
Section Quiz
Slide
of 43
© Copyright Pearson Prentice Hall

40. 3.3 Section Quiz
1. 1 Mg = 1000 kg. Which of the following would
be a correct conversion factor for this
relationship?
a.
1000.
b.
1/1000.
c. ÷ 1000.
d. 1000 kg/1Mg.
Slide
of 43
© Copyright Pearson Prentice Hall

41. 3.3 Section Quiz
2. The conversion factor used to convert joules to
calories changes
a. the quantity of energy measured but not the
numerical value of the measurement.
b. neither the numerical value of the measurement
nor the quantity of energy measured.
c. the numerical value of the measurement but not
the quantity of energy measured.
d. both the numerical value of the measurement and
the quantity of energy measured.
Slide
of 43
© Copyright Pearson Prentice Hall

42. 3.3 Section Quiz
3. How many
g are in 0.0134 g?
a. 1.34
10–4
b. 1.34
10–6
c. 1.34
106
d. 1.34
104
Slide
of 43
© Copyright Pearson Prentice Hall

43. 3.3 Section Quiz
4. Express the density 5.6 g/cm3 in kg/m3.
a. 5.6
106kg/m3
b. 5.6
103kg/m3
c. 0.56 kg/m3
d. 0.0056 kg/m3
Slide
of 43
© Copyright Pearson Prentice Hall

44. END OF SHOW