Blog Post #1
(November 22, 2015)
This week, we started a new unit, chemical reactions. In chemical reactions,sensory clues a change has taken place.
There are 4 different ways in determining a change has taken place:
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| Gives the four conclusions and describes exo and endo reactions as well. http://images.slideplayer.com/7/1663161/slides/slide_33.jpg Anatomy of a chemical equation: Left: Reactants Right: Products -->: Yield |
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| http://images.slideplayer.com/1/273858/slides/slide_4.jpg Subscripts & Coefficients Subscripts: tell the number of atoms in each element Coefficients: tell the number of molecules Other key terms Delta H: Change in heat. (H-: Exo; H+: Endo) AQ: Aqueous (dissolved in water.) Precipitate: A solid form of a solution. Examples of Chemical Reactions: Methane reacts with gaseous oxygen to form gaseous carbon dioxide and water. - CH4 + O2(g) --> CO2(g) + H2O (Remember we need lowest whole number ratio, and the equations have to be balanced on both sides) -CH4 + 2O2(g) --> CO2(g) + 2H2O Useful Links to help practice with: |
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