1. bolt!
what was
measured?

2. 12.23 grams of chocolate what !? (back to) CHAPTER 1 Chemistry and You
Numbers in Science….
They aren’t just numbers anymore! ?
67.9 _____________ ?
____________ ?
The record of a measurement includes:
grams of chocolate
working with units….
1. units in calculations ______________________________________
_______________________________________________
2. unit conversions ____________________________________
________________________________________________
bolt!
what was
measured?
what !?
unit (increment)
of what
# of units

3. 12.23 grams of chocolate The record of a measurement includes:
working with units….
1. units in calculations ____________________________________
________________________________________________
2. unit conversions ______________________________________
_______________________________________________
unit (increment)
of what
# of units
units “act” like numbers (sort of)…
the units of your answer must match the quantity you are solving for
three different
quantities
converting measurements between
UNITS of the SAME quantity

4. 0.000000000001 m OR 110-12 m OR 1 pm (picometer) working with units….
1. unit conversions ______________________________________
_______________________________________________
“need” to in calculations ____________________________
_________________________________________
convenience _______________________________
________________________________________
converting measurements between
UNITS of the SAME quantity
so that measurements
of a given quantity are in the same unit
hours and sec don’t’ cancel…
need to convert sec to hours
OR hours to sec
so that the magnitudes of measurements
are given in numbers that are not too small or large
or into units that are
more familiar…
meters/sec to
miles / hour
m OR 110-12 m OR
1 pm (picometer)

5. working with units….
1. unit conversions ______________________________________
_______________________________________________
start with a measurement (record of a measured value)
________ ___________ _____________
how many ______________ is equivalent to?
can’t ask
how many _____________ is equivalent to?
how many ______________ is equivalent to?
converting measurements between
UNITS of the SAME quantity
increments
(units)
value (#of)
of what
unit of the same quantity _____________
unit of the quantity _____________
unit of the quantity _____________

6. start with a measurement (record of a measured value)
________ ___________ _____________
how many ______________ is equivalent to?
need to know how many ___________ in a _____________
unit equality ______________ = ______________
construct the conversion factor (or unit factor)
increments
(units)
value (#of)
of what
(a)
(b)
(a)
(b)

7. set up conversions on board

8. Bolt’s speed