ICP

11/12/12Balancing Chemical Equations

Warmup

For 1-4, count how many of each element are in the following:

1) H2O

2) Ca(NO3)2

3) 2H2O

4) 2Ca(OH)2

5) Five construction teams each build one building weighing 23 tons apiece. By how many tons have their buildings increased the mass of the earth?

Warmup Answers

1) H2O2-H, 1-O

2) Ca(NO3)2 1-Ca, 2-N, 6-O

3) 2H2O4-H, 2-O

4) 2Ca(OH)2 2-Ca, 4-O, 4-H

5) No increase in mass. All the materials to build the buildings came from the earth.

Reminder

• Turn in vocabulary.

Law of Conservation of Matter

• Matter can neither be created nor destroyed in a chemical reaction, only rearranged.

• This applies to how we balance equations.

(Copy this down in notes)

Number 1 Rule for Balancing!

• Do not change the chemicals or their subscripts! You may only change the coefficients in front.

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