Chemistry Reference
In-Depth Information
25 g
dy
1 kg
1000 g
365 dy
1 yr
9.125 kg
yr
×
×
=
which rounds to 9.1 kg/yr
Once again, the order that you place down the conversion factors doesn't
matter. What is important is that you were able to cross-cancel the units
that you didn't want and that you got the same final answer. Did you re-
member to round your answer to 2 significant digits? We rounded that way
because we started off with 2 significant digits in the problem.
Now, try the following practice questions and check your answers at
the end of the chapter before moving on to the next lesson.
Lesson 2-5 Review
Use the factor-label method to make the conversions in numbers 1-5.
1.
4.53 km to cm
2.
2.34 days to seconds
3.
0.23 yards to inches
4.
45.4 centimeters/second to meters/hour
5.
0.03 milliliters/second to liters/week
6.
Which of the following represents a proper conversion factor?
a)
4 feet
second
1 m
100 cm
3 yd
ft
day
week
b)
c)
d)
7.
Which of the following represents a proper conversion factor?
a)
1 mg
1000 g
1000 km
1 m
100 cm
ft
1000 cm
3
1 L
b)
c)
d)
8.
Which of the following does not represent a proper conversion factor?
a)
1 g
100 cm
3
1 km
1000 m
1000 cm
3
1 L
1 cm
3
1 ml
b)
c)
d)
9.
Which of the following conversion factors could you make use of, if
you were converting km/h to m/s?
a)
1 km
100 cm
3
60 s
1 h
1 km/h
1000 m/s
1000 m
1 km
b)
c)
d)
10. Which of the following conversion factors could you make use of, if
you were converting L/min to ml/s?
a)
1 L
100 cm
3
60 min
1 h
1 km
1000 m
1000 ml
1 L
b)
c)
d)
