UNIT 2.2
SI UNITS/METRIC CONVERSIONS
SI UNITS


SI = International system of metric units.
Base unit = all other units are multiples of base
units or combinations)
Quantity
length
mass
time
amount of substance
Written unit
Symbol
SI UNITS
2. MULTIPLES OF BASE UNITS (p.17)
** Need to know this table
Written Prefix
Symbol
Exponential
mega
kilo
deci
centi
milli
micro
M
k
d
c
m
μ
106
103
10-1
10-2
10-3
10-6
 106
 103
 10-1
 10-2
 10-3
 10-6
2.2 SI UNITS
3. IMPORTANT EQUIVALENCES
1
mL = 1 cm3
1
m3 = 103 L
1
t = 103 kg
2.2 SI UNITS
Example:
 Re-write the expression “6 kilograms” using
PREFIX and UNIT SYMBOLS
 an EXPONENTIAL EQUIVALENT

The prefix symbol for kilo is ___ and the unit
symbol for grams is ___
 6 kilograms =

The exponential equivalent to kilo is ____
 6 kilograms =

METRIC CONVERSIONS

Metric conversions involve using unit
conversions between prefix symbols and
exponential equivalents.
Example:
 Write a conversion statement between cm and m.
METRIC CONVERSIONS
Write conversion statements between each of the
following

dm and m

cs and s

dmol and mol
METRIC CONVERSIONS

How many milligrams are in 5 kg?
METRIC CONVERSIONS

Express 7µm in Megametres
METRIC CONVERSIONS
How many decilitres in 0.5kL?
MULTI CONVERSION
Convert 1cg/ mL into dg/L
METRIC CONVERSIONS
DERIVED QUANTITIES

Derived quantity =

Derived unit =
DENSITY
Density is an example of a derived unit
 What is density?


Density =
DERIVED UNITS: DENSITY

Given that a 2.44 cm3 sample of an element has a mass
of 47.14 g. Determine the density of the element.
DERIVED UNITS

Find the volume of a block of wood that has a
mass of 34.5 grams. The density of this wood is
12g/cm3
ASSIGNMENT- DUE Tuesday
Hebden
Page19 #13, 14, 15(a,c,d,f,g,i),
Page 21 #16 (a,c,e)
#17 (b,d,f,h,j,L,n)
#18(a, b, c)
Finish ALL the questions on your 2 sheets:
A-Measurement and the Metric System
This is Homework for marks. Have this done by
Tuesday. Show ALLLLL your calculations for every
problem!