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

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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

- (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

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

N2(g) + 3H2 (g) 2NH3(g)

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

Coefficients

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