Balancing Word Equations and More!

Tuesday October 8th, 2013

1. Review Worksheets that were for homework

If you missed yesterday, we went over the homework reviewing balancing equations that was assigned last friday, Here are the answers to each question, just giving the number that should be before the equations in order.

1. 2,3,2,3
2. 1,2,1,2
3. 2,2,2,1
4. 1,2,2,1
5. 1,2,1,2
6. 3,1,1,3
7. 2,3,1,6
8. 1,2,2,1,1
9. 2,2,1
10. 2,2,1
11. 2,1,1
12. Balanced
13. 2,1,2
14. 1,2,1,2,1
15. Balanced
16. 1,3,1
17. 2,2,3
18. 2,1,1,2
19. 1,1,1,2,2
20. 3,1,1,3

Mrs. Friendmann also explained to us that the equation AgCH3COO can be re-written as AgC2H3O2.

We also learned that when balancing equations you can use decimals, and then just multiply the answer by 2 as follows.

C(4)H(10) + O(2) -----> CO(2) + H(2)O

When you try to balance the equation, you'll find that its easiest to do it like this:

C(4)H(10) + 6.5 O(2) --------> 4 CO(2) + 5 H(2)O

Yet since we need whole numbers as our multipliers, we can just multiply the equation by 2 to get the answer we need. Here is the final equation:

2 C(4)H(10) + 13 O(2) ------> 8 CO(2) + 10 H(2)O

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2. Balancing word equations

Mrs, Friedmann next assigned us two worksheets to work on tonight, one of which is the normal balancing equations and the other is balancing word equations. Balancing word equations is just like balancing formula equations, except you have to add the extra step of finding the formulas for the names of the compounds. You also have to remember Prof. HONClBrIF in order to accurately get the formulas of all the diatomic elements. So if you see the name Chlorine Gas, its not Cl, its Cl(2) because it is diatomic. You can find examples of these on the moodle page, but if you don't feel like searching, I've done number 2 for you here.

Aluminum Bromide and Chlorine Gas react to form Aluminum Chloride and Bromine Gas

Formula:  AlBr(3) + Cl(2) ---------> AlCl(3) + Br(2)

Now that the equation is written in formula form, we can simply balance. Here is the final answer:

2 AlBr(3) + 3 Cl(2) ----------> 2 AlCl(3) + 3 Br(2)

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3. Tests!

For the last 30 minutes of class we went over the tests in small groups, working on fixing our errors on the word problems, hoping to understand what we did wrong. This lasted till the end of the period.

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