Chemfluency

Section 1: Elements and Compounds

Section 2: Compounds and Reactions in Solution

CHALLENGE 10

Visualizing Dissolution

View videos and animations of compounds dissolving

CHALLENGE 11

Visual Ionic Compound Solubility

View videos and animations of compounds dissolving

CHALLENGE 12

Ionic Compound Solubility Practice

Determine whether ionic compounds are soluble or insoluble in water

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CHALLENGE 13

Visualizing Precipitation Reactions

CHALLENGE 14

Predicting Precipitation Reactions

Predict when a combination of two solutions results in a precipitate

CHALLENGE 15

Visualizing Acid-Base Reactions

Determine whether ionic compounds are soluble or insoluble in water

CHALLENGE 16

Classifying Electrolytes

Classify soluble compounds as strong, weak, or nonelectrolytes

Section 3: Stoichiometry

CHALLENGE 17

Calculating Molar Mass

Calculate molar mass using the compound formula and elemental molar masses

CHALLENGE 18

Using Molar Mass: Elements

Use molar mass to convert between mass and moles of elements

CHALLENGE 19

Using Molar Mass: Compounds

Use molar mass to convert between mass and moles of compounds

CHALLENGE 20

Compound Stoichiometry

Relate moles of elements in a sample of a compound using its molecular formula

CHALLENGE 21

Reaction Stoichiometry

Use a balanced chemical equation to relate moles of reactants and products

CHALLENGE 22

Stoichiometry Problem Solving

Map the path to solving problems and choose conversion factors to get you through it

CHALLENGE 23

Experiment: Determining Hydration Number

Determine the hdyration number of a hydrated compound by watching a video of an experiment, making observations and calculating the results

CHALLENGE 24

Limiting Reactants

Calculate which reactant limits a chemical reaction based on given moles

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CHALLENGE 25

Solution Concentration

Calculate molarity for compounds in solution and for individual ions they may produce

CHALLENGE 26

Dilution

Practice solution dilution calculations

Section 4: Thermochemistry

CHALLENGE 27

Experiment: Thermal Energy Transfer

Estimate the temperature of a very hot piece of metal

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CHALLENGE 28

Experiment: Enthalpy of Neutralization

Use a calorimetry experiment to determine the enthalpy change for a reaction

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CHALLENGE 29

Hess's Law

Practice using Hess's law

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CHALLENGE 30

Enthalpy of Formation

Practice using enthalpy of formation values to predict the enthalpy change for reactions

Section 5: Atomic and Molecular Structure

CHALLENGE 31

The Electromagnetic Spectrum

Explore trends and relationships between different types of electromagnetic radiation

CHALLENGE 32

Shells, Subshells and Orbitals

Explore what orbitals exist and recognize their shapes

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CHALLENGE 33

Quantum Numbers

Match orbitals with appropriate quantum numbers

CHALLENGE 34

Periodic Properties

Rank elements in terms of atomic radius, ionization energy, and electron affinity

CHALLENGE 35

Formal Charge

Determine the formal charge of atoms from Lewis structures

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CHALLENGE 36

Drawing Lewis Dot Structures

Draw Lewis dot structures for small covalent molecules

CHALLENGE 37

Molecular Structure

Identify electron and molecular geometries from Lewis structures and molecular formulas

CHALLENGE 38

Hybridization

Determine the hybridization of central atoms in molecules

CHALLENGE 39

Polarity

Determine the polarity of molecules

Section 6: Properties of Gases, Liquids and Solids

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CHALLENGE 40

Gas Laws

Relate gas properties qualitatively and quanitatively

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CHALLENGE 41

The Ideal Gas Law

Use the ideal gas law to determine amounts of gas phase substances

CHALLENGE 42

Intermolecular Forces

Determine the intermolecular forces experienced by molecules

CHALLENGE 43

Properties of Liquids

Use IMFs to rank properties of liquids

CHALLENGE 44

Molecular Solubility

Predict whether molecular compounds are soluble in water

Section 7: Kinetics and Equilibrium

CHALLENGE 45

Graphical Rate Law Determination

Determine the rate law for a reaction using concentration-time plots

CHALLENGE 46

Equilibrium

Explore how the equilibrium constant K governs molecular populations

CHALLENGE 47

Identifying Acids and Bases

Categorize compounds or ions in terms of acid-base behavior

CHALLENGE 48

Acid-Base Conjugate Pairs

Explore how the equilibrium constant K governs molecular populations

CHALLENGE 49

pH Practice

Practice calculations involving pH

CHALLENGE 50

Interpret pH Titration Curves

Recognize the type of pH titration from the pH plot

CHALLENGE 51

Acid-Base Speciation

Determine which acid-base state a system is in based on pH and pKa

Section 8: Thermodynamics

CHALLENGE 52

Predicting Entropy Change

Predict the sign of entropy change based on a chemical reaction equation

CHALLENGE 53

Predicting Thermodynamic Favorability

Predict thermodynamic favorability based on enthalpy and entropy changes