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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. - PowerPoint PPT Presentation
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Chemical rnx (reaction)
Baking a cake or burning wood VsWater to Ice
What is Water to Vapor (boiling water)
(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)
The break down: Symbols
“+” separates products or separates reactants yield, make; separates products from reactants. Points to product. (direction of rnx)
g= gas or vaporl=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)
Coefficients
What is special about the coefficient in front of the Nitrogen gas?