Tampa BSides - Chef's Tour of Microsoft Security Adoption Framework (SAF)
12 14 Balancing Review1
1. Launch: 12/14
Grab your binder and immediately take a seat!
Place binder paper and a pen/pencil on your desk.
Review Objective #1: I can write balanced chemical
equations.
Tonight’s HW: Finish Review Worksheet #1
10. Announcements
Unit #5 Exam on Thursday
3 days to review
Ask questions!
No copying HW or classwork!
Make-up work is due on Wednesday
Binder check this week
14. What’s a chemical equation?
CH4 + 2O2 CO2 + 2H2O
Reactants Products
“turn into”
15. What’s a chemical equation?
4Fe2(CO3)3
Coefficient
Multiply! Subscript
8 X Fe
12 X C
36 X O
16. How are equations balanced?
There is a 3-step process for balancing
equations:
1. Count the atoms on both sides
2. Change a coefficient & multiply out
3. Check tally (and repeat)
Rule: You can’t change the subscripts!
22. Snowman Challenge
Directions:
Send one group member to pick a card
Write down the equation and #
Balance it showing all work (count, coefficient, check)
When finished, send one group member to have me
check your answer
Rules:
If you pick it, solve it
Only one card at a time
Show your work!
Work together
23. Exit Slip
HC2H3O2 + NaHCO3 NaC2H3O2 + H2CO3
1. Which of the following correctly identifies all of
the reactants in the above chemical equation.
a. NaC2H3O2
b. NaHCO3
c. NaC2H3O2 and HC2H3O2
d. HC2H3O2 and NaHCO3
24. Exit Slip
2. How many C atoms are there in 3C2H4?
a. 2
b. 3
c. 5
d. 6
25. Exit Slip
H2 + Cl2 HCl
3. Is the above equation balanced?
a. No, because H2 has a coefficient of 2.
b. No, because the number of Cl and H atoms are not
equal on both sides of the equation.
c. Yes, because the number of H atoms is not equal on
both sides.
d. Yes, because there are equal numbers of atoms on
both sides of the equation.
26. Exit Slip
4. Which of the following is a balanced equation for
the combustion of ethanol (C2H6O)?
a. C2H5OH + 3O2 CO2 + 2H2O
b. C2H5OH + 3O2 2CO2 + 3H2O
c. C2H5OH + O2 2CO2 + 3H2O
d. C2H5OH + 2O2 3CO2 + 2H2O
27. Exit Slip
__C2H2 + __H2 __CH4
5. When the equation above is completely balanced,
the coefficient for H2 would be
a. 1
b. 2
c. 3
d. 4