Presentation on theme: "Aim CE1a What does the chemical equation for photosynthesis tell us?"— Presentation transcript:
1 Aim CE1a What does the chemical equation for photosynthesis tell us? Chemical EquationsAim CE1aWhat does the chemical equation for photosynthesis tell us?
2 Chemical ReactionsA chemical change that occurs, producing new arrangements of elements and compoundsChemical EquationsA short hand version of chemical reactionsEach substance in the reaction is represented by chemical formulasAn arrow ( ) shows the direction of the reactionSubstances on the left side are generally reactants (your chemical “ingredients”)Substances on the right side are generally products (what you made)
3 Parts of a Chemical Equation Chemical formulas The abbreviations for the elements or compounds in the reactionSubscripts are in many chemical formulasThey show the number of atoms in each substanceCoefficients are in the chemical equationThey show the number of atoms, ions, or molecules of each type in the reaction
4 2 H2O(g) + O2(g) 2H2O(g) A Visual of a Chemical Equation coefficientsProducts2 H2O(g) + O2(g) 2H2O(g)Reactants chemicalyield signphase symbolsQuestion: what is the coefficient of oxygen?Question: how many hydrogen atoms are on the left and right of the reaction?
5 Example of a chemical reaction and its equation:What is the chemical equation for the Gummy Bear Demo, the heating of solid potassium chlorate which produces the oxygen gas and solid potassium chloride?Written out form: Solid potassium chlorate yields oxygen gas and solid potassium chlorideChemical Equation form: KClO3(s) O2(g) + KCl (s)
6 Al(s) + CuCl2(aq) AlCl3(aq) +Cu(s) Try these:Solid Sodium metal and chlorine gas yield solid sodium chlorideChemical Equation form:Na(s) + Cl2(g) NaCl(s)Aluminum metal and aqueous copper II chloride yield aqueous aluminum chloride and copper metalAl(s) + CuCl2(aq) AlCl3(aq) +Cu(s)
7 Balancing Chemical Equations In the reaction, Na(s) + Cl2(g) NaCl(s) , the Law of Conservation of Matter is broken… Why?The number of atoms of each element on the left does not equal the number of atoms on the rightThe reaction is not balancedBalancing is done be adding coefficients to the front of each substance in order to increase the number of atoms or molecules of each type in the equation