CHALLENGE 01

The Periodic Table: 1 - 4

Place elements in the first four periods in their proper locations

CHALLENGE 02

Elements of Consequence

Explore elements present in real-world things

CHALLENGE 03

Classifying Elements

Classify chemical elements as metals, nonmetals or metalloids

CHALLENGE 04

Ionic & Covalent Compounds

Classify chemical compounds as ionic or covalent based on their formulas

CHALLENGE 05

Monatomic Ions

Identify the charges on common monatomic ions

CHALLENGE 06

Polyatomic Ions

Match polyatomic ion formulas with their names

CHALLENGE 07

Ionic Compound Formulas

Match polyatomic ion formulas with their names

CHALLENGE 08

The Salts Within Us

Match polyatomic ion formulas with their names

CHALLENGE 09

Compound Naming

Name chemical compounds or identify formulas from names

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

CHALLENGE 13

Predicting Precipitation Reactions

Predict when a combination of two solutions results in a precipitate

CHALLENGE 14

Visualizing Acid-Base Reactions

Determine whether ionic compounds are soluble or insoluble in water

CHALLENGE 15

Classifying Electrolytes

Classify soluble compounds as strong, weak, or nonelectrolytes

CHALLENGE 16

Calculating Molar Mass

Calculate molar mass using the compound formula and elemental molar masses

CHALLENGE 17

Using Molar Mass: Elements

Use molar mass to convert between mass and moles of elements

CHALLENGE 18

Using Molar Mass: Compounds

Use molar mass to convert between mass and moles of compounds

CHALLENGE 19

Compound Stoichiometry

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

CHALLENGE 20

Reaction Stoichiometry

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

CHALLENGE 21

Stoichiometry Problem Solving

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

CHALLENGE 22

Hydration Number Experiment

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

CHALLENGE 23

Limiting Reactants

Calculate which reactant limits a chemical reaction based on given moles

CHALLENGE 24

Dilution

Practice solution dilution calculations

CHALLENGE 25

Formal Charge

Calculate which reactant limits a chemical reaction based on given moles

CHALLENGE 26

Molecular Structure

Identify molecular structures, electron geometries, and Lewis structures across 5 levels

CHALLENGE 27

Hybridization

Determine the hybridization of central atoms in molecules

CHALLENGE 28

Polarity

Determine the polarity of molecules

CHALLENGE 29

Intermolecular Forces

Determine the intermolecular forces experienced by molecules

CHALLENGE 30

Properties of Liquids

Use IMFs to rank properties of liquids

CHALLENGE 31

Molecular Solubility

Predict whether molecular compounds are soluble in water

CHALLENGE 32

Graphical Rate Law Determination

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

CHALLENGE 33

Equilibrium

Explore how the equilibrium constant K governs molecular populations

CHALLENGE 34

Identifying Acids and Bases

Categorize compounds or ions in terms of acid-base behavior

CHALLENGE 35

Acid-Base Conjugate Pairs

Explore how the equilibrium constant K governs molecular populations

CHALLENGE 36

pH Practice

Practice calculations involving pH

CHALLENGE 37

Interpret pH Titration Curves

Recognize the type of pH titration from the pH plot

CHALLENGE 38

Acid-Base Speciation

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

CHALLENGE 39

Predicting Entropy Change

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

CHALLENGE 40

Predicting Thermodynamic Favorability

Predict thermodynamic favorability based on enthalpy and entropy changes