Launch: 11/19   Grab your binder and immediately take a seat!

  Take out your notes and prepare for the quiz!   What are reactants, products, coefficients, subscripts?   What is the principle of conservation of matter?   Is 2C2H6 + 7O2 4CO2 + 6H2O balanced?

  What is the coefficient for H2O when the below equation is balanced: __H2O __H2 + __O2

  Warning: We will start the quiz without study time if the room gets too noisy!

Quiz!   Good SAT behavior = up/down and no talking

Announcements   Points end next week and the competition is getting

fierce   Be engaged   Be respectful

What is a conversion factor? – Part II

Mr. Heffner 11/20/09

How are conversion factors used?   There is a 3-step process:

1.  Identify the starting and ending units. 2.  Pick a conversion factor that has the starting units

on the bottom and the ending units on the top. 3.  Multiply out.

Activity   Dimensional Analysis Cards

Exit Slip 1.  Which of the following is a correct way to show the

conversion factor: 100 millimeter (mm) = 1 centimeter (cm)?

a. 

b. 

c. 

d. 

10 mm 1 cm

100 mm 1 cm 1 cm 1 mm

100 cm 1 mm

Exit Slip 2.  Which of the following conversion factors would need

to be used to convert from seconds to minutes?

a. 

b. 

c. 

d. 

1 hour 60 minute

1 hour 60 minutes

1 minute 60 seconds 60 seconds

1 hour

Exit Slip

3.  Using the above conversion factor, how many centimeters (cm) are there in 2 meters (m)?

a.  2 cm

b.  20 cm c.  50 cm

d.  200 cm

100 cm 1 m

Exit Slip 60 minutes = 1 hour

4.  Using the above conversion factor, how many hours are there in 240 minutes?

a.  1 hour

b.  4 hours c.  24 hours

d.  60 hours

Exit Slip 100 mm = 1 cm 100 cm = 1 m

5.  Using the above conversion factors, how many millimeters (mm) are there in 4 meters (m)?

a.  40 mm

b.  100 mm c.  400 mm

d.  4000 mm

Homework   Finish practice question worksheet