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

  Place homework (balancing buffet) on desk.

__C + __Br2 __CBr4

1.  When the equation above is completely balanced, the coefficient for Br2 would be

a.  0

b.  1

c.  2

d.  4

Launch 11/19 __Na + __H2O __NaOH + __H2

2.  When the above equation is completely balanced, the coefficient for NaOH would be

a.  1.

b.  2. c.  4.

d.  8.

Announcements   Quiz tomorrow!

  Study hard tonight on balancing equations   Reactants, products

  Balanced vs. unbalanced

  Balancing

  Points end next week and the competition is getting fierce   Be engaged   Be respectful

What is a conversion factor?

Mr. Heffner 11/19/09

What are units?   Units are…

  ways to measure quantities

  a.k.a. “Units of measurement”

  Examples:   grams (g)   liter (L)

  meter (m)

What are conversion factors?   Conversion factors are…

  used to convert from unit to another unit.

  Example:   1 Little Cesar’s pizza = 8 slices

What are conversion factors?   We can show conversion factors as fractions:

1 Little Cesar’s pizza = 8 slices

1 pizza 8 slices

8 slices 1 pizza

or

Same thing, just flipped!

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.

Whiteboards   Work in pairs

  Trade-off marker every question

  You have 60 seconds to draw the answer   Show all three steps!

  Lift board only when prompted

How many trifles are there in 1 wazoo?

How many bamboos are there in 2 wickets?

How many gidgantics are there in 4 bamboos?

How many bamboos are there in 10 gidgets?

How many bizbastics are there in 8 wazoos?

How many bamboos are there in 500 wazoos?

Exit Slip 1.  Which of the following is not a way to show the

relationship between pizzas and slices.

a. 

b. 

c. 

d.  1 pizza = 8 slices

1 pizza 8 slices 8 slices 1 pizza

12 pizzas 1 dozen

Exit Slip 2.  Which of the following is a correct way to show the

conversion factor 1 gidget = 5 wazoos?

a. 

b. 

c. 

d. 

5 wazoos 1 gidget 1 wazoo 5 gidgets 5 gidgets 1 wazoo

5 gidgantics 1 wazoo

Exit Slip 3.  Which of the following conversion factors would need

to be used to convert from wickets to bamboos?

a. 

b. 

c. 

d. 

1 wazoos 5 gidget

1 bamboo 5 gidgets 1 wicket

10 bamboos 5 wickets 5 wazoos

Exit Slip 4.  How many trifles are there in 2 wazoos?

a.  2 b.  4

c.  8 d.  16

Exit Slip 5.  How many bizbastics are there in 2 wazoos?

a.  2 b.  4

c.  8 d.  16

Homework   Finish practice question worksheet