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I can balance a chemical equation.

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Presentation on theme: "I can balance a chemical equation."— Presentation transcript:

1 I can balance a chemical equation.
January 16, 2018 Answer is F I can balance a chemical equation.

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4 Last week we learned how to count atoms in molecules/compounds.
Let’s recall: How many atoms are in each molecule below? 2C3H8 6 carbon atoms, 16 hydrogen atoms, total of 22 atoms Na2SO4 2 sodium atoms, 1 sulfur atom, 4 oxygen atoms, total of 7 atoms 2(NH4)3PO4 N = 6 H = 24 P = 2 O = 8 Total = 40 atoms I can balance a chemical equation.

5 Now it’s time to apply what we learned about counting atoms to balancing chemical equations..
Remember: Mass of reactants = mass of products All of the atoms present at the beginning of the reaction are present at the end of the reaction but they are rearranged I need to end with only 1 carbon atom. So if I start with 1 atom of carbon… I can balance a chemical equation.

6 Rules for balancing equations…
NEVER touch/change the subscripts!!!! You also can’t add subscripts!!!! You can only add coefficients. You may not add coefficient in the ‘middle’ of a chemical formula. Ex: CaCl Ca2Cl You must end up with the same number & kinds of atoms on both sides of the equation when you are finished. Count atoms on both side to check yourself. I can balance a chemical equation.

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8 I can balance a chemical equation.

9 I can balance a chemical equation.

10 Balancing Equations Cl Cl Cl Cl H H H H H2 + Cl2  2 HCl (balanced)
(unbalanced) H2 + Cl2  2 HCl (balanced)

11 1st Step: Draw a T chart below the equation.
2nd Step: write how many of each reactant you have. 3rd Step: write how many of each product you have. 2 2 4th Step: Are you in balance? No H = 2 O = 2 4 H = 2 O = 1 4 2 5th Step: Adjust the coefficients to balance the equation. Final Step: Count atoms on each side. includes pratice questions

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14 With your group…


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