SI+Units+and+Metric+Unit+conversions

= __Part 1 SI unit__ =

**What is SI unit?**
The international System(SI) of metric units is a comprehensive set of units of measurement.

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.
 * base units and additional units that are used in chemistry11**


 * 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

unkown amount=# of ms Initial amount= 3s 1 ms =103 milliseconds
 * 1) 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.