DRILL Quiz … is the exact opposite of decomposition.

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Presentation transcript:

DRILL Quiz … is the exact opposite of decomposition. The molar mass of Ga(ClO3)3 is …

Objective The student will be able to: Compare and contrast the empirical and molecular formula of a compound.

SAT/HSA ENRICHMENT Which of these nitrogen fertilizers has the highest nitrogen content –ammonia [NH3], or urea [CO(NH2)2].

What is the difference b/w Empirical and Molecular Formulas? Empirical Formulas What is the difference b/w Empirical and Molecular Formulas?

Empirical Formulas The empirical formula gives the lowest whole-number ratio of the atoms of the elements in a compound. The empirical formula of a compound shows the smallest whole-number ratio of the atoms in the compound.

Empirical Formulas Ethyne (C2H2) is a gas used in welder’s torches. Styrene (C8H8) is used in making polystyrene. These two compounds of carbon have the same empirical formula (CH) but different molecular formulas.

Molecular Formulas The molecular formula of a compound is either the same as its experimentally determined empirical formula, or it is a simple whole-number multiple of its empirical formula.

Molecular Formulas

Molecular Formulas Methanal, ethanoic acid, and glucose all have the same empirical formula—CH2O.

Quick Quiz 2. Which of the following is NOT an empirical formula? NO2 H2N CH C3H6

Quick Quiz 3. Determine the molecular formula of a compound that contains 40.0 percent C, 6.71 percent H, and 53.29 percent O and has a molar mass of 60.05 g. C2H4O2 CH2O C2H3O C2H4O

Empirical Formula Students will work together to complete an Empirical Formula worksheet. 10 min

Empirical Formula Determination Empirical Formula Determination Lab Purpose To determine the empirical formula of Magnesium oxide. 55 min

Summary Did we accomplish the objective? Explain. What information can you obtain from an empirical formula? Compare and contrast molecular formula and empirical formula.

Summary 4. Which of the following molecular formulas are also empirical formulas? Ribose (C5H10O5) Ethyl butyrate (C6H12O2) Chlorophyll (C55H72MgN4O5) DEET (C12H17ON)

Homework Empirical Formula Worksheet