11 13 what is a chemical equation
TRANSCRIPT
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Launch: 11/13 Grab your binder and immediately take a seat!
1. How many of each atom are in the following molecules:
i. Br2 ii. H2S iii. CCl4
iv. H2SO4 v. C6H12O6
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Announcements Binder checks are worth a decent number of
points!
It is really important that you Do your launches
Finish your homework (and get a stamp) Make-up all work from absences
lpschem.wordpress.com
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What are chemical equations?
Mr. Heffner 11/13/09
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A chemical equation is… a representation of a chemical reaction
2H2 + O2 2H2O
What are chemical equations?
Reactants Products
• The substances that are produced (made) • Right
• The substances that react • Left
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A chemical equation is… a representation of a chemical reaction
2H2 + O2 2H2O
What are chemical equations?
Reaction Arrow
• “turns into”
• like an equals (=) sign
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A chemical equation is… a representation of a chemical reaction
2H2 + O2 2H2O
What are chemical equations?
Coefficients Subscripts
• Comes after the atom
• Sub = below
• Comes before the compound
• distributed to all
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Example 1. How many H atoms does 2H2 have?
multiply the subscript and the coefficient Coefficient = 2
Subscript = 2
2 X 2 = 4 hydrogen atoms
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Example 2. How many H atoms does 2H2O have?
multiply the subscript and the coefficient Coefficient = 2
Subscript = 2
2 X 2 = 4 hydrogen atoms
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Example 3. How many O atoms does 2H2O have?
multiply the subscript and the coefficient Coefficient = 2
Subscript = not there = 1
2 X 1 = 2 oxygen atoms
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Example 4. How many O atoms does Mg(OH)2 have?
multiply the subscript and the coefficient Coefficient = not there = 1
Subscript = 2
1 X 2 = 2 oxygen atoms
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Foldable Make foldable and define terms. Draw an
illustration if necessary. 1. Chemical equation 2. Reactants 3. Products
4. Coefficient 5. Subscript
6. Chemical reaction 7. Chemical bond 8. Molecule/compound
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Practice Question Practice question handout
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Exit Slip 1. What are chemical equations?
a. Representations of chemical reactions in which the reactants are listed to the left of a reaction arrow.
b. Representations of chemical bonds in which 2 valence electrons are depicted by a straight line
c. Representations of chemical reactions in which the. products are listed to the left of the reaction arrow.
d. A way to show how reaction arrows turn into reactants.
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Exit Slip HC2H3O2 + NaHCO3 NaC2H3O2 + H2CO3
2. Which of the following correctly identifies all of the reactants in the above chemical equation.
a. NaC2H3O2
b. NaHCO3 c. NaC2H3O2 and HC2H3O2 d. HC2H3O2 and NaHCO3
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Exit Slip 4Na + 4H2O 4NaOH + 2H2
3. Which of the following identifies the coefficient for H2O in the above chemical equation?
a. 1
b. 2 c. 4 d. 8
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Exit Slip 4. How many C atoms are there in 3C2H4?
a. 2 b. 3
c. 5 d. 6
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Exit Slip 5. Which of the following identifies the correct
number of atoms in 3H2SO4? a. 3 H atoms, 3 S atoms, 3 O atoms b. 2 H atoms, 1 S atom, 4 O atoms c. 6 H atoms, 3 S atoms, 4 O atoms
d. 6 H atoms, 3 S atom, 12 O atoms
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Homework Finish practice question worksheet