Topic: Chem Math Aim: How do you perform unit conversions? What is the factor label method? Do Now:...
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Transcript of Topic: Chem Math Aim: How do you perform unit conversions? What is the factor label method? Do Now:...
Topic: Chem MathAim: How do you perform unit
conversions? What is the factor label method?
Do Now: How many inches in a foot? Feet in a yard? So… how many inches are in a
yard?HW:
Unit Conversions
• Units important in ALL CALCULATIONS• Factor Label Method - preferred way to show
conversions between quantities• You’ll have: given unit• Need to find: desired unit• Performed by cancelling units (moles, grams,
liters, molecules)• It’s pretty much awesome.
Unit Conversions – I show you.
• Convert 6 feet to inches• Easy – 72 inches• You did conversion based on the ratio of 1ft =
12in• Write given # & unit on left, desired unit on
right• Input conversion factor between
Unit Conversions
What you haveConversion factor
What you want
_12 in_1 ft
_6 ft_ _? inX =
_1 ft_12 in
_6 ft_ _? in=X
Unit Conversions
• When you set up your conversion factor, put the unit you want to GET RID OF on the BOTTOM, and the unit you WANT on the TOP.
desired___ get rid of
Unit Conversions• Convert 19 ft to yd• What do we know?• What do we want to know?• What conversion factor do we use?• Set up the conversion!• Which way does the conversion factor go? Why?• Calculate the answer!
Unit Conversions• Convert 13 yards to inches• What do we know?• What do we want to know?• What conversion factor do we use? (Hint: you
can use more than one!)• Set up the conversion!• Which way does the conversion factor(s) go?
Why?• Calculate the answer!
Unit Conversions
• Convert 4.8yd to mm• What do we know?• What do we want to know?• What conversion factor do we use? (Hint: you
can use more than one!) Also: 2.54cm = 1in• Set up the conversion!• Which way does the conversion factor(s) go?
Why?• Calculate the answer!
Unit Conversions
• The average life is 77 years.• Calculate the number of heartbeats in your
life. (avg 70 beats/minute)• Calculate the number of eye blinks in your life.
(avg 12 blinks/minute)