Part 1 SI unit

What is SI unit?

The international System(SI) of metric units is a comprehensive set of units of measurement.

base units and additional units that are used in chemistry11
This table contains the base units in the international system (the forth 4 rows, from meter to mole) and some additional units that used in Chemitry11. The full base units are not show in this t able because we won't use it this year.


Name
Quantity
Symbol
meter
length
m
gram*
mass
g*
second
time
s
mole
Amount of substance
mol
litre
volume
L
tonne
mass
t
*In the SI system the base unit of mass should be kilogram but gram is considered to be the base unit in Chemistry11.

SI prefix

These prefix are prefix used most frequently in Chemistry 11.

Written Prefix
Prefix symbol
Equivalent exponential
mega
M
106
kilo
k
103
deci
d
10-1
centi
c
10-2
milli
m
10-3
micro
μ
10-6

For Pracise

1. Re-write the following using PREFIX and UNIT SYMBOLS and the FACTOR it represents:

a) 2.5 centimetres c) 25.2 millimoles e) 0.25 megalitres
b) 1.3 kilograms d) 5.1 decigrams f) 6.38 micrograms

2. Re-write the following using PREFIX SYMBOLS, and WRITTEN PREFIXES and UNITS

a) 4.5 x 10-3 mol c) 0.50 x 10-6 L e) 8.85 x 106 s
b) 1.6 x 103 m d) 2.68 x 10-1 g f) 7.25 x 10-2 m

Part 2 Metric conversions

what is metric conversions?

The metric conversions is an international decimalised(means transform) system of measurement.
here are some prefixs that you can use

Example : Express 3s into milliseconds

unkown amount=# of ms
Initial amount= 3s
1 ms =103 milliseconds
#of millisecongds=3s x 1 ms/10-3 =3 x 103 ms

Exercise:
1. Express 3.5 mL/min in microlitres/second
2. Express 80.0 Mg in micrograms.


Read text book page19-23 for the same stuff.