Chemical+Equations

Reading https://www.thoughtco.com/examples-of-chemical-reactions-in-everyday-life-604049 http://www.nature.com/scitable/knowledge/library/the-conservation-of-mass-17395478 Video https://www.brainpop.com/science/matterandchemistry/conservationofmass/ https://www.youtube.com/watch?v=3lHHOiTdmK4 https://www.youtube.com/watch?v=2S6e11NBwiw

__ Chemical Equations 1 __ Compare the number of atoms for each element before and after the reaction arrow. a) Rust 4Fe + 3O2 à 2Fe2O3 b) Ammonia N2 + 3H2 → 2NH3 c) Salt 2Na + Cl2 à 2NaCl d) Combustion of Alcohol C2H5OH + 3O2 à 2CO2 + 3H2O e) Combustion Propane C3H8 + 5O2 → 4H2O + 3CO2 f) Combustion Gasoline C8H18 + 25O2 → 8CO2 + 9H2O g) Cells using food - Respiration C6H12O6 + 6O2 → 6CO2 + 6H2O h) Photosynthesis 6CO2 + 6H2O → C6H12O6 + 6O2

After the arrow: 1 Do the kinds of atoms change? 2 Do the number of atoms change? 3 What stays the same? 4 What changes? 5 What happens in chemical reactions? 6 What doesn’t happen in chemical reactions? p. 226 7. What principle have you just explored? 8. What are the products of combustion? 9. Compare photosynthesis and respiration?

Chemical Equations 2 (Conservation of Matter Applied) Fix the right side of the arrow using the conservation of matter principle.

Synthesis of water 2H2 + O2 → ...... H2O

Synthesis of Lithium Chloride 2Li + Cl2 → ...... LiCl

Getting Iron from Ore 2Fe2O3 + 3C → ..... Fe + ......CO2

Burning Carbon 2C + 2O2 → .....CO2

Combustion of Propane C3H8 + 5O2 → 4H2O + 3CO2

Photosynthesis – Sugar from light 6 CO2 + 6 H2O + light → ......C6H12O6 + ......O2

Respiration – energy from food C6H12O6 + 6O2 → ......CO2 + ......H2O + energy

C6H12O6 → ......C2H5OH + ......CO2 + energy