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Equation Analogy

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Every skateboard requires one deck (the board), two trucks (the mounted axles), and four wheels. ... Symbol = shorthand for an atom of an element. ... – PowerPoint PPT presentation

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Title: Equation Analogy


1
Section 7.1
  • Equation Analogy
  • Imagine that you work at a skateboard shop and
    you are in charge of assembling the skateboards.
    Every skateboard requires one deck (the board),
    two trucks (the mounted axles), and four wheels.
  • 1. Your boss asks you to make five skateboards.
    How many trucks do you need?
  • 2. The following diagram shows the recipe for
    one skateboard. What do you notice about the
    relative amounts of each part on either side of
    the arrow?

2
Answers
Section 7.1
  • 1. Your boss asks you to make five skateboards.
    How many trucks do you need?
  • 10
  • 2. The following diagram shows the recipe for
    one skateboard. What do you notice about the
    relative amounts of each part on either side of
    the arrow?
  • There are the same numbers of each part on
    either side of the arrow.

3
Terms chapter seven
  • Symbol
  • Subscript
  • Formula
  • Equation
  • Coefficient
  • Atom inventory
  • Balanced
  • Conservation of atoms

4
Skills chapter 7.1
  • How do you do an atom inventory?
  • How do you balance an equation?

5
  • Symbol shorthand for an atom of an element.
  • Formula shorthand for the molecules or basic
    units of a compound.
  • Equation shorthand for what happens during a
    chemical change.

6
  • Subscripts in a chemical formula tell how many
    atoms of an element are present in that
    compounds basic unit
  • Coefficients in a balanced equation tell how many
    units of each reactant are needed and how many
    units of each product are made.
  • Coefficients tell the reacting ratio
  • 2Na Cl2 ? 2 NaCl

7
  • Reactants starting materials
  • Products end resulting materials
  • Law of conservation of atoms The atoms present
    in the reactants are rearranged to form the
    products. Atoms are not lost or gained during a
    reaction.

8
Burning of Carbon
Figure 2
9
Burning of Carbon
10
Burning of Carbon
11
Burning of Carbon
Atom inventory C 1 C 1 O 2 O
2
12
The formation of water
13
The formation of water
Atom inventory Reactants Products H 4 H
4 O 2 O 2
14
Combustion of Propane
Figue 17
15
Combustion of Propane
Figure 17
16
Combustion of Propane
Figure 17
17
Combustion of Propane
Figure 17
18
Answers to paper clip activity
  • SO2 H2O ?H2SO3
  • Reactants Products
  • S 1 S1
  • O3 O3
  • H2 H2 balanced
  • 2H2S 3O2 ? 2SO2 2H2O
  • reactants products
  • H4 H4
  • S2 S2
  • O6 O6 balanced

19
  • 3. CS2 3O2 ? 2SO2 CO2
  • reactants products
  • C1 C1
  • S2 S2
  • O6 O6 balanced
  • 4. N2 3H2? 2NH3
  • reactants products
  • N2 N2
  • H6 H6 balanced

20
  • 5. 2NO O2 ? 2NO2
  • reactants products
  • N2 N2
  • O4 O4 balanced
  • 6. 3O2?2O3
  • reactants products
  • O6 O6 balanced

21
  • H2SO3 ? H2O SO2
  • reactants products
  • H 2 H2
  • S1 S1
  • O3 O3 balanced
  • C6H12O6 6O2 ? 6 CO2 6 H2O
  • reactants products
  • C6 C6
  • H12 H12
  • O18 O18 balanced

22
  • 9. N2 O2 ? 2NO
  • reactants products
  • N2 N2
  • O2 O2 balanced
  • 10. CH4 2O2 ? CO2 2H2O
  • reactants products
  • C 1 C 1
  • H 4 H 4
  • O 4 O 4 balanced

23
Answers to Cons. of atoms ex.
  • 2a. N2 O2 ? 2NO
  • Reactants products
  • N2 N2
  • O2 O2

24
  • 2b. 2NO O2 ? 2NO2
  • Reactants products
  • N2 N2
  • O4 O4

25
  • 2c. H2O 2NO2? HNO3 HNO2
  • reactants products
  • H2 H2
  • N 2 N2
  • O 5 O5

26
  • 2d. N2 3H2 ? 2NH3
  • reactants products
  • N2 N2
  • H 6 H6

27
  • 2e. 4NH3 5O2 ? 4 NO 6H2O
  • reactants products
  • N4 N4
  • H12 H12
  • O10 O10

28
  • 2f. NH3 HNO3 ? NH4NO3
  • reactants products
  • N2 N 2
  • H 4 H 4
  • O 3 O 3

29
  • 3a. C6H12O6 6O2 ? 6 CO2 6 H2O
  • reactants products
  • C6 C6
  • H12 H12
  • O18 O18

30
  • 3b. 6 CO2 6 H2O ?C6H12O6 6O2
  • reactants products
  • C6 C6
  • H12 H12
  • O18 O18

31
When to balance an equation
  • For the equation as it is given do an atom
    inventory.
  • If the atom inventory is the same on both sides,
    the equation is correctly balanced and you are
    finished!
  • If the atom inventory is not the same, it is not
    balanced and you need to balance the equation.

32
CH4 O2 ? H2O CO2
Atom Inventory Reactants Products C 1 C
1 H 4 H 2 O 2 O 3 Equation is not
balanced!
33
How to balance an equation
  • A coefficient is changed or added in front of any
    formula to increase the number of atoms of a
    particular element.
  • Update your inventory after adding or changing a
    coefficient.

34
CH4 O2 ? 2H2O CO2
Atom Inventory Reactants Products C 1 C
1 H 4 H 4 O 2 O 4 Equation is still
not balanced!
35
  • Keep adding and/or changing the coefficients in
    front of the formulas until both checklists in
    your atom inventory are the same.
  • When both lists are the same, the equation is
    balanced and you can stop.

36
CH4 2O2 ? 2H2O CO2
Atom Inventory Reactants Products C 1 C
1 H 4 H 4 O 4 O 4 Equation is
balanced!
37
  • Only coefficients may be added or changed.
  • You may not change any subscripts or formulas in
    order to balance the equation.

38
N2 H2 ? NH3 Atom
Inventory Reaactants Products N 2 N 1 H
2 H 3 Equation is not balanced!
39
N2 H2 ? 2NH3 Atom
Inventory Reaactants Products N 2 N 2 H
2 H 6 Equation is not balanced!
40
N2 3H2 ? 2NH3 Atom
Inventory Reaactants Products N 2 N 2 H
6 H 6 Equation is balanced!
41
Answers to Balancing Equations
  • CH4 2O2 ? CO2 2H2O
  • Zn 2HCl ? H2 ZnCl2
  • 2C O2 ? 2CO
  • H2 S ? H2S
  • 4Al 3O2 ?2Al2O3
  • 4Li O2 ? 2Li2O
  • 3Mg N2 ? Mg3N2
  • 4NH3 5O2 ? 6H2O 4NO

42
http//www.studyworksonline.com
43
Quiz on monday
  • Be able to do an atom inventory
  • Be able to balance an equation
  • Be able to draw or to interpret models for
    equations.
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