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Quick Review

Quick Review. 1. Process where chemical substances change into new substances = chemical reaction 2. Substances that are started out with before a reaction occurs = reactants 3. Substances that are ended with after a reaction occurs = products

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Quick Review

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  1. Quick Review 1. Process where chemical substances change into new substances = chemicalreaction 2. Substances that are started out with before a reaction occurs = reactants 3. Substances that are ended with after a reaction occurs = products 4. A simplified explanation of a reaction using chemical symbols = chemicalequation

  2. Quick Review For the following use the chemical equation Br + NaO → NaBr + H2O 5. Reactants = BrandNaO 6. Products = NaBrandH2O 7. Does this obey the Law of Conservation of Mass = No, H is in the products but not in the reactants.

  3. Chemistry Lesson 1.8 – Balancing Chemical Reactions

  4. I can determine if a simple chemical equation is balanced. (2a) 1. What: Chemical equations must have the samenumberof eachtypeof atom in the reactantsas in the products. a. If there are a total of fouroxygen atoms in the reactants, there must be a total of fouroxygen atoms in the products. CH4 + 2O2 CO2 + 2H2O

  5. I can determine if a simple chemical equation is balanced. (2a) b. If each type of atom has the same number on both sides of the reaction, it is said to be balanced. Balanced! CH4 + 2O2 CO2 + 2H2O

  6. I can determine if a simple chemical equation is balanced. (2a) 2. Why: Mattercannot be createdor destroyedso if it exists in the reactants it must also be in the products. a. The idea that matter cannot be created or destroyed is the Lawof Conservationof Mass. We can’t violate LAWS! Br(aq)+ NaOH(s)→ NaBr(s)+ H2O(l) Violates the Law of Conservation of Mass

  7. I can determine if a simple chemical equation is balanced. (2a) HCl + KOH KCl+ H2O 3. How a. We can listall of the differenttypesof atoms in the reactants b. We then listall the differenttypesin the products.

  8. I can determine if a simple chemical equation is balanced. (2a) c. We can then compareby countingto see if we have the samenumberof each type of atom in the reactants and products. i. If there are the same type and number, the equation is balanced. ii. If there are a different number or extra types of atoms, the equation is NOTbalanced. HCl + KOH KCl+ H2O

  9. Guided Practice You should be working with us, not ahead!

  10. Guided Practice 1. Is the chemical equation HBr + NaOH → NaBr + H2O balanced? a. List the different types of atoms and the number of each type in the reactants. b. List the different types of atoms and the number of each type in the products. c. Compare

  11. Guided Practice 2. Is the chemical equation CH4 + O2 → CO2 + 2H2O balanced? • List the different types of atoms and the number of each type in the reactants. • List the different types of atoms and the number of each type in the products

  12. I-N-D-E-P-E-N-D-E-N-T Do you know what that means?

  13. Exit Ticket Show what you know!!! (5 Questions)

  14. 1. Which choice below gives the number of oxygen and hydrogen atoms in the reactants? 6H2O2  2H2O + O2? • 2 oxygen and 2 hydrogen • 3 oxygen and 2 hydrogen • 4 oxygen and 4 hydrogen • 12 oxygen and 12 hydrogen

  15. 2. How many oxygen atoms are found in the reactants of the following chemical equation? Cl2O5 + H2O → HClO3

  16. 3.How many oxygen atoms are found in the products of the following chemical equation? C6H12O6 + O2 → 6CO2 + 6H2O

  17. 4. Write “YES” if the following equation is balanced. Write “NO” followed by the atomic symbol of the unbalanced atom if the equation is unbalanced. (Ex. “NO H”) Fe2O3 + 2Al → 2Fe + Al2

  18. 5. Write “YES” if the following equation is balanced. Write “NO” followed by the atomic symbol of the unbalanced atom if the equation is unbalanced. (Ex. “NO H”) PbCO3(s) → PbO(s) + C4O2(g)

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