1. AIM: How do we convert units using conversion factors?
Unit 2 MATH OF CHEMISTRY
2.3 How do we convert units?
AIM: How do we convert units using conversion factors?
DO NOW:
This is review from Thursday:
Try the following questions using Table C
1km = _______________m
800cm = _______________m
9mm= _________________m

2. WHAT IS CONVERSION FACTOR?
is a fraction that helps us convert from one unit to another
Example: 1m = ? Km
1m x 1km = 1km
1000m
1m = 0.001km
= 0.001km
1000

3. HOW DO YOU SET UP A CONVERSION FACTOR?
1 m
100cm
300cm x
=300m
100 m
Unit you want to
end up with
Unit you want to
Get rid off

4. REMEMBER!
SMALLER #, LARGER UNIT
LARGER #, SMALLER UNIT
1 m
100cm

5. LET’S TRY SOME 1km = 1 1000mm=1 m m 1000m = 1 1 m = 1 km mm
1m = cm = 1
cm m
1000 1 1
1000
100 1

6. How many milliliters (mL) are in 0.851Liters (L)?
SET UP
How many milliliters (mL) are in 0.851Liters (L)?
Set up a proportion
Units you want to get rid off MUST BE in the DENOMINATOR
What you know x (unit you want)
(unit you want
to get rid of)
0.851L x mL L
1000 1

7. Units you want to get rid off MUST BE in the DENOMINATOR
Set up a proportion
Units you want to get rid off MUST BE in the DENOMINATOR
Multiply out
CHECK!
0.851L x mL L
1000
= x mL
1000
= 851mL 1
0.851L = 851mL
0.851L = 851 (10-3)L

8. How many meters are in 1.57 km? How many kilograms are in 10.5g?
TRY ON YOUR OWN
Set up a proportion
Units you want to get rid off MUST BE in the DENOMINATOR
Multiply Out
Check!
How many meters are in 1.57 km?
How many kilograms are in 10.5g?

9. METRIC MANIA Worksheet
NEXT
Complete the
METRIC MANIA Worksheet
When you are done, you may work on the following:
CHEMISTRY VOCABULARY JOURNAL
- you will be allowed to use this on your quizzes and (some of) your exams