#chemistry examples

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Chemistry Notes (October 2021)

Acidic, Basic, or Neutral Ex 6

Assigning Formal Charges Ex 5

Balancing Chemical Equations Ex 4

Bragg’s Law Ex 2

Complex Lewis Structure Formal Charges Ex 4

Electrolytes of Strong Acids List

Ionic Solids

Lewis Structure Vocabulary

Meitnerium

Mendelevium

Multiple Formal Charges Ex 4

PCl5 VSEPR Diagram

Physical and Chemical Properties

Proposed Lewis Structure Ex 1

Reactant Concentration vs Time

Relative Interactions and Solution Formation

Structures of Commercially Important Polymers

Total Charge of Molecule Ex 2

X-Rays and Crystal Structures

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Chemistry Notes (February 2021)

Calcium

Calculating Empirical Formulas Ex. 3

Disulfur Dichloride

Dubnium

dxy Orbital

Einsteinium

Enthalpy of Reaction Ex. 1

Ionic Equations Ex. 1

Myosins

Niobium Pentoxide

Pressure Unit Conversions Ex. 1

Pressure Units

SI Prefix Symbols

Simple Gas Laws

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Chemistry Notes (Jan 2021)

Calculating Atomic Mass Ex 4

Calculating Excess Ex 1

Electrons in Orbitals

Fluorine

Formula Mass

Gas Evolution Reactions

Lewis Structure

Potassium

Representing Molecules

Solution Interactions

Subshells

Tennessine

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Finding Percent by Mass Ex 1

-- find the percent by mass of O in Fe2O3      -- Fe = 55.846 g/mol      -- O = 15.999 g/mol

-- two iron, so 2 ( 55.846 ) = 111.6920 g/mol

-- three oxygen, so 3 ( 15.999 ) = 47.9970 g/mol

-- total mass is 111.6920 + 47.9970 = 159.6890 g/mol

-- percent oxygen = ( total mass of oxygen / total mass ) x 100

-- % O = ( 47.9970 / 159.6890 ) x 100

-- % O = 30.06%

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Grams to Moles Ex 1

-- calculate the number of moles of sulfur in 57.8 g of sulfur

-- the molar mass of sulfur is 32.06 g S

57.8 g S x (1 mol S / 32.06 g S)

57.8 g S x (1 mol S / 32.06 g S)

1.80 mol S

-- so 57.8 grams of sulfur is almost 2 moles

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