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Balancing equations (Ch.4) <
In chapter 4 we learn that chemical eq
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Balancing equations (Ch.4) <
In chapter 4 we learn that chemical equations use symbols and formulas to represent elements and compounds that undergo a reaction. Using crackers or cookies to represent all the reacting elements, construct a model to show and to balance ONE of the following chemical reactions (see attachment for an example for the first reaction). Use butter/jelly or other edible adhesives to join elements together to make the molecules. When you respond to a classmate, check their balancing, and kindly tell them if you think they are correct or not.<
Choose one reaction to balance. <
a) H2O –> H2 + O2(Splitting of water)<
b) CH4 + O2 –> CO2 + H2O (Combustion of methane)<
c) H2O2–> O2 + H2O (Decomposition of hydrogen peroxide)<
d) H2 + N2 –> NH3 (Production of ammonia)<
e) N2 + O2 –> NO (Reaction of nitrogen and oxygen in lightning)<
f) Fe + O2 –> Fe2O3 (Rusting of iron)<
g) Mg(OH)2 + HCl –> MgCl2 + H2O (milk of magnesia + stomach acid)<
Use a different type of cracker for each element. So for reaction (g), you would need 4 types for Mg, O, H and Cl.<
You can change the number of starting and ending molecules, but you cannot change the formulas of the compounds presented in the equation. O2 cannot be changed to O3 for instance.<
You cannot split a cookie to represent half of a molecule.<
Your final reaction must have the same number of each type of cookie/cracker on both sides of the reaction.<
Take a picture of your final results before eating.<
Share a photo of your work and tell the class about the experience of balancing your chosen reaction. Did counting the cookies/crackers help this process make more sense? Why do you think it’s important to balance chemical equations?
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