Balancing equations
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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). Law of conservation of matter. This law states matter can neither be created or destroyed only converted. Word equation.

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Chemical vs physical changes
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
Law of conservation of matter

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


Word equation
Word equation

  • (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)


Ch 4 g o 2 g h 2 o l co 2 g
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


Word problems
Word Problems

Nitrogen gas reacts with hydrogen gas form ammonia vapor.

N2 (g) + H2 (g)  ___ (g)

N2 (g) + H2 (g)  NH3(g)


We need coefficients to help balance equations
We need coefficients to help balance equations

N2(g) + 3H2 (g)  2NH3(g)

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

Coefficients


Tally method
Tally method

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


In partners
In partners

CuSO4 + Al  Al2(SO4)3 + Cu

OR

Na + H2O  NaOH + H2

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


Balancing equations

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


Balancing equations

Na + H2O  NaOH + H2

Na=1 Na=1

O=1 O=1

H=2 H=3

2Na + 2 H2O  2NaOH + H2