Chemical, Empirical, and Molecular Oh My!

Slides:

Advertisements

Similar presentations

Section 5: Empirical and Molecular Formulas

Advertisements

Chapter 7 – The Mole and Chemical Composition

Chemistry Notes Empirical & Molecular Formulas. Empirical Formula The empirical formula gives you the lowest, whole number ratio of elements in the compound.

Empirical and Molecular Formulas

Percent Composition Empirical Formulas and Molecular Formulas Quantification in Chemistry.

The Mole & Chemical Formulas A chemical formula represents the ratio of atoms that always exists for that compound Example: Water – H 2 O Always 2 H atoms.

Molar Mass & Percent Composition

Percent Composition, Empirical Formulas, Molecular Formulas

Chemical Formulas and Molar Masses A few old ideas revisited and a few new.

Chemical Formulas and Molar Masses A few old ideas revisited and a few new.

1.2 Formulas Define the terms empirical formula and molecular formula Determine the empirical formula and/or the molecular formula of a given.

Empirical Formulas 4/1 - ATB: If an unknown sample has 1 mole of H and 1 mole of Cl, what would be the formula of this compound?

MOLECULAR FORMULAS (here you will be using empirical to help you determine molecular formulas)

The Mole and Chemical Composition

Percent Composition and Empirical Formulas Last part of chapter 8, we have done the rest of it already.

Counting Large Quantities Many chemical calculations require counting atoms and molecules Many chemical calculations require counting atoms and molecules.

Chemical Formulas and Moles. Example: 1.water (C) – every molecule of water contains 2 atoms of hydrogen & one atom of oxygen - 2 molecules of H 2 O would.

Using the MOLE. Percentage composition Percentage composition is the mass of individual elements in a compound expressed as a percentage of the mass of.

Percentage Percentage means ‘out of 100’

Molar Mass Practice Calculate the molar mass of the following: Hydrogen Fe Iron II sulfate.

The mole (abbreviation: mol) is the amount of substance equal to 6.02 x particles These particles can be atoms, ions, formula units,molecules, electrons,

Mole Calculations. The Mole Mole – measurement of the amount of a substance. –We know the amount of different substances in one mole of that substance.

CH 9: The Mole Renee Y. Becker CHM 1025 Valencia Community College 1.

Section 6.3 Formulas of Compounds 1.To understand the meaning of empirical formula 2.To learn to calculate empirical formulas 3.To learn to calculate the.

The Mole, part II Glencoe, Chapter 11 Sections 11.3 & 11.4.

Gas Density The density of gases is much less than that of liquids.

Empirical and Molecular Formula Miss Knick HAHS. Empirical Formula O Is the simplest whole number ratio of the atoms in a compound Practice: Empirical.

Mr. Chapman Chemistry 20. Converting from grams to moles Need: Moles and Mass worksheet.

Empirical & Molecular Formulas. Percent Composition Determine the elements present in a compound and their percent by mass. A 100g sample of a new compound.

An SCH 2D1 Production C 18 H 20 BrNO 3. Today’s Agenda 2  Calculating Percent Composition  Determining Chemical Formulas.

FORMULAE CHEMICAL, EMPIRICAL, AND MOLECULAR FORMULA OH MY!

FORMULAE CHEMICAL, EMPIRICAL, AND MOLECULAR OH MY!

  Proportion or ratio of each element in a chemical compound  Percentage by mass of an element in a particular substance  Expressed as grams of element.

Calculating Empirical Formulas

Percent Composition What is the % mass composition (in grams) of the green markers compared to the all of the markers? % green markers = grams of green.

Chapter 3: Calculations with Chemical Formulas and Equations MASS AND MOLES OF SUBSTANCE 3.1 MOLECULAR WEIGHT AND FORMULA WEIGHT -Molecular weight: (MW)

Chemical Formulas. Mass Percent Also known as percent composition. Shows the mass of each element in a compound as a percent of the total mass of the.

Percent Composition Determine the mass percentage of each element in the compound. Determine the mass percentage of each element in the compound. Mass.

7.5 Molar Mass and Calculations

H.W. # 1 Study pp (sec. 4.1) pp (sec. 4.4) Ans. ques. p. 108 # 1,2,4

Empirical Formula: Smallest ratio of atoms of all elements in a compound Molecular Formula: Actual numbers of atoms of each element in a compound Determined.

Chapter 7 “Chemical Formulas and Chemical Compounds”

Calculating Molecular Formulas

Empirical & Molecular Formulas

6.7 Empirical Formula and 6.8 Molecular Formulas

The Mole and Avogadro’s Number

Determine the empirical formula of the compound containing:

Empirical and Molecular Formulas

Chemical Compostition

Empirical Formula Molecular Formula

Empirical formula – the chemical formula of a compound written using the smallest, whole number, mole ratio between atoms in the compound. What is the.

Mass Relationships in Chemical Formulas

Unit 6 Mole Calculations

Chemical Formula’s.

Empirical Formulas and Mole Ratios

Empirical and Molecular Formulas

Empirical and Molecular Formulas

Chemical Formulas.

Empirical Formulas Unit 5.

molecular formula: a whole-number multiple of an empirical formula…

Vocabulary Percent Composition -

Mole Calculations Converting number of particles to moles

Empirical & Molecular Formulas

Chemical Calculations

% Composition, Empirical and Molecular Formulas

Empirical Formula of a Compound

Calculating Empirical and Molecular Formulas

Empirical and Molecular Formulas

Calculating Empirical and Molecular Formulas

Chapter 7- Sec. 3 and 4 “Chemical Formulas and Chemical Compounds”

Presentation transcript:

Chemical, Empirical, and Molecular Oh My! chemistry Chemical, Empirical, and Molecular Oh My!

chemical Formula A way of expressing the number of atoms of a compound Write the chemical formula of the following: Sodium chloride ____________ Lithium oxide ____________ Iron (II) bromide ____________ Ammonium sulfide ____________

chemical Formula A way of expressing the number of atoms of a compound Write the chemical formula of the following: Sodium chloride NaCl Lithium oxide Li2O Iron (II) bromide FeBr2 Ammonium sulfide (NH4)2S

Types of chemical Formula Molecular Formula Identifies the number of each type of atom Example: Hexane: C6H14 Empirical Formula Simplest whole number ratio of atoms of each element Example: Hexane: C3H7 Structural Formula Shows the structure of the molecule

Find the empirical formula Substance Molecular Formula Empirical Formula Water H2O Methane CH4 Benzene C6H6 Sulfur S8 Glucose C6H12O6

Find the empirical formula Substance Molecular Formula Empirical Formula Water H2O Methane CH4 Benzene C6H6 CH Sulfur S8 S Glucose C6H12O6 CH2O

Find the Molecular and Empirical Formula’s

Example 1: A sample of compound contains 5.723 g Ag, 0.852 g S, and 1.695 g O. Determine its empirical formula.

Example 1: A sample of compound contains 5.723 g Ag, 0.852 g S, and 1.695 g O. Determine its empirical formula.

Example 1: A sample of compound contains 5.723 g Ag, 0.852 g S, and 1.695 g O. Determine its empirical formula.

Example 1: A sample of compound contains 5.723 g Ag, 0.852 g S, and 1.695 g O. Determine its empirical formula.

Example 1: A sample of compound contains 5.723 g Ag, 0.852 g S, and 1.695 g O. Determine its empirical formula. Ans: Ag2SO4

Example 2: A sample of compound contains 18.7% Li, 16.3% C and 65.5% O by mass. Determine its empirical formula.

Example 2: A sample of compound contains 18.7% Li, 16.3% C and 65.5% O by mass. Determine its empirical formula. Ans: Li2CO3

Molecular Formula To find the Molecular Formula we use the following relationship Where Molar Mass is the mass of the Molecular Formula Where N = the whole number multiple by which the empirical mass is increased

Example 3: List 3 possible molecular formula. A compound has an empirical formula of NH2 and a molar mass of 32.1 g/mol. List 3 possible molecular formula. What is the compound’s molecular formula?

Example 3: List 3 possible molecular formulae. A compound has an empirical formula of NH2 and a molar mass of 32.1 g/mol. List 3 possible molecular formulae. NH2, N2H4, N3H6 What is the compound’s molecular formula? N2H4

Example 4: A compound containing 40.0% carbon, 6.7% hydrogen and 53.3% oxygen has an atomic mass of 180.2 g/mol. What is the molecular formula?

Example 4: A compound containing 40.0% carbon, 6.7% hydrogen and 53.3% oxygen has an atomic mass of 180.2 g/mol. What is the molecular formula? CH2O

Example 4: A compound containing 40.0% carbon, 6.7% hydrogen and 53.3% oxygen has an atomic mass of 180.2 g/mol. What is the molecular formula?

Molecular Formula: C6H12O6 Example 4: A compound containing 40.0% carbon, 6.7% hydrogen and 53.3% oxygen has an atomic mass of 180.2 g/mol. What is the molecular formula? Molecular Formula: C6H12O6

In-Class Work Complete “Determining empirical formula” and Molecular Formula worksheet. Finish for homework.