Chemistry Reference
In-Depth Information
Some properties are
measured in units that
are derived from such a
large combination of
base units that scientists
have given them new unit
names and symbols.
These new units and sym-
Units and Their SI Equivalents
SI-Derived
Unit
Equivalent
Unit
Symbol
Property
N
force
kg × m/s
2
Newton
energy
kg
× m
2
/s
2
joule
J
Figure 2-1f
bols are still based on, and are equivalent to, the original combination of
base units. Figure 2-1f shows some examples.
Now, try the following practice questions and check your answers at
the end of the chapter before moving on to the next lesson.
Lesson 2-1 Review
1.
The SI unit for length is the _______________.
2.
The SI unit called the “ampere” measures _______________.
3.
The SI unit for temperature is the _______________.
4.
There are __________ centigrams in one gram.
5.
There are __________ centigrams in one kilogram.
6.
Convert 3.45 meters to centimeters.
7.
Convert 7640 decimeters to kilometers.
8. Which of the following is not an SI base unit?
a) meter b) candela c) mole d) joule
9. Which of the following units is used to measure energy?
a) meter b) candela c) mole d) joule
10. Which of the following quantities cannot be measured with a single
SI base unit?
a) speed
b) time
c) length
d) mass
Lesson 2-2: Measuring Matter
Chemistry is a quantitative science, which means that it is concerned with
measurements that involve quantities or numbers, such as the amount of
space a substance takes up or how much it weighs. Those measurements,
which analyze the quantity of matter, are of especial importance to chemists.
