Chapter 7 Section 4.1
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Chemistry
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10th - 12th Grade
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Hard
Abby Fancsali
Used 3+ times
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6 Slides • 5 Questions
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Chapter 7 Section 4: Determining Chemical Formulas
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Multiple Choice
Review Question: Which of the following compounds does not contain a polyatomic ion?
Sodium Carbonate
Sodium Sulfate
Sodium Sulfite
Sodium Sulfide
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Introduction
When a new substance is discovered, we analyze it to reveal the percentage composition
Using this information we can determine an elements empirical formula
Empirical formula consists of the symbols for the elements combined in a compound, with the subscripts showing the smallest whole number ratio of the different atoms in the compound
the simplest ratio of atoms
For an ionic compound this is the chemical formula
for molecular compound it may not always be the molecular formula
Diborane gase
Molecular formula: B2H6. Empirical formula: BH3
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Multiple Choice
The molecular formula for acetylene is C2H2. The molecular formula for benzene is C6H6. Which of the following is the empirical formula for both
CH
C2H2
C6H6
(CH)2
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Calculation of Empirical Formulas From Percentage composition
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Calculation of Empirical Formulas From Percentage composition
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Practice problem L page 246
Quantitative analysis shows that a compound contains 32.38% sodium, 22.65% sulfur, and 44.99% Oxygen. Find the empirical formula
First step: go from percentage composition to mass composition
32.38% Na = 32.38 g Na
22.65% S = 22.65 g S
44.99% O = 44.99 g O
Second step: convert mass to moles
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Practice problem L page 246
Chapter 7 Section 4: Determining Chemical Formulas
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