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# Balancing Equations - PowerPoint PPT Presentation

Balancing Equations. Chemical vs Physical changes. Chemical rnx (reaction) Baking a cake or burning wood Vs Water to Ice What is Water to Vapor (boiling water). Law of conservation of matter. This law states matter can neither be created or destroyed only converted. Word equation.

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## PowerPoint Slideshow about ' Balancing Equations' - casey-hopkins

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### Balancing Equations

Chemical vs Physical changes

• Chemical rnx (reaction)

Baking a cake or burning wood

Vs

Water to Ice

What is

Water to Vapor (boiling water)

• This law states matter can neither be created or destroyed only converted.

• (all words) Solid ammonium chromate when heated decomposes into ammonia gas and solid Chromate while giving off energy.

(NH4)2(CrO4)(s) (NH4)(g) + CrO4 (s)

CH4 (g) + O2 (g) H2O (l) + CO2(g)

The break down:

Symbols

“+” separates products or separates reactants

 yield, make; separates products from reactants. Points to product. (direction of rnx)

g= gas or vapor

l=pure liquid

aq= aqueous solution; dissolved into water; all acids are aqueous.

s= solid

Nitrogen gas reacts with hydrogen gas form ammonia vapor.

N2 (g) + H2 (g)  ___ (g)

N2 (g) + H2 (g)  NH3(g)

N2(g) + 3H2 (g)  2NH3(g)

What is special about the coefficient in front of the Nitrogen gas?

Coefficients

CH4 + 2O2 CO2 +2H2O

C=1 2(O=2)=4 C=1 2(H=2)=4

H=4 O=2 2(O=1)=2

O=4

CuSO4 + Al  Al2(SO4)3 + Cu

OR

Na + H2O  NaOH + H2

**Hint----- Balance Hydrogen's Last

CuSO4 + Al  Al2(SO4)3 + Cu

Cu=1 Cu=1

S=1 S=3

O=4 O=12

Al=1 Al=2

3CuSO4 + 2Al  Al2(SO4)3 + 3Cu

Na + H2O  NaOH + H2

Na=1 Na=1

O=1 O=1

H=2 H=3

2Na + 2 H2O  2NaOH + H2