Chp.12/Activity #4 Chemical Equations (p792) Due Today: HW. Number of atoms in a formula Learning...
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Transcript of Chp.12/Activity #4 Chemical Equations (p792) Due Today: HW. Number of atoms in a formula Learning...
![Page 1: Chp.12/Activity #4 Chemical Equations (p792) Due Today: HW. Number of atoms in a formula Learning targets Represent chemical changes using word equations.](https://reader035.fdocuments.in/reader035/viewer/2022072013/56649e5d5503460f94b556fe/html5/thumbnails/1.jpg)
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Chp.12/Activity #4 Chemical Equations (p792)
Due Today:
HW. Number of atoms in a formula
Learning targets•Represent chemical changes using word equations
and chemical equations.•Use the principle of conservation of matter to
balance chemical reactions.
2/25/2015Wednesday
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1. Carbon Monoxide2. CCl4
3. Iron (III) Oxide4. Al2(SO4)3
5. CuF2
6. Magnesium Sulfate
7. How does an ionic compound form? What forms the bond?8. How does a covalent compound form? What forms the
bond?
COCarbon TetrachlorideFe2O3
Aluminum SulfateCopper (II) FlourideMgSO4
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Chemical Reactions and Equations
• The scientific word for chemical change is “Chemical Reaction”• Chemical Reactions are written in Chemical Equations.• E.g. Zn + 2HCl -> ZnCl2 + H2 is a chemical equation.
• A Chemical Reaction involves the breaking/formation of chemical bonds• E.g. H-Cl bond is broken and H-H bond is newly formed.
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Law of Conservation of Mass
•Matter is never created or destroyed.• So the Total Mass of the Reactants and the Products need to be the same.
• E.g. Zn + 2HCl -> ZnCl2 + H2
Element Reactants Products
Zn 1 1
Cl 2 2
H 2 2
Both sides have the same number and kind of elements!
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Balancing Chemical Equations
• You first need to be able to count the number of atoms.• Coefficients (always whole numbers) tell us how many
compounds we have.• E.g. 2HCl means we have 2 of the HCl molecules.
(total of 2 Hydrogen and 2 Chlorine atoms)• E.g. 6ZnCl2 means we have 6 of the ZnCl2 molecules.
(total of 6 Zinc and 12 Chlorine atoms)• Tip: Multiply the Coefficient with subscripts to get the
number of atoms.
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Balancing Chemical Equations
• Reactants and Products need to have the same number of atoms for the same elements.• Elements are not created or destroyed in a chemical reaction.
• Use the Element Inventory to keep track of atoms.• Change coefficients to match the number of atoms.
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E.g. NaOH + H2SO4 -> Na2SO4 + H2O
Element Reactants ProductsNa 1 2S 1 1O 5 5H 3 2
Important: Change One Coefficient at a time.
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E.g. 2NaOH + H2SO4 -> Na2SO4 + H2O
Element Reactants ProductsNa 2 2S 1 1O 6 5H 4 2
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E.g. 2NaOH + H2SO4 -> Na2SO4 + 2H2O
Element Reactants ProductsNa 2 2S 1 1O 6 6H 4 4
Done!
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Can you balance these chemical equations?1. NaCl + BeF2 -> NaF + BeCl2 2NaCl + BeF2 -> 2NaF + BeCl2
2. FeCl3 + Be3(PO4)2 -> BeCl2 + FePO4
2FeCl3 + Be3(PO4)2 -> 3BeCl2 + 2FePO4
3. CH4 + O2 -> CO2 + H2O
CH4 + O2 -> CO2 + 2H2O
4. AgNO3 + LiOH -> AgOH + LiNO3
AgNO3 + LiOH -> AgOH + LiNO3
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A Beginner’s Guide to Balancing Equations• https://www.youtube.com/watch?v=_B735turDoM