ADI Online Chemistry Investigations

CHEM-01: Bond Character and Polarity

Guiding Question: How does atom electronegativity affect bond character and molecular polarity?

Goal: The students' goal in this investigation is to use a computer simulation to explore the effects of atom electronegativity on bond character and molecular polarity.

Lab Description: The simulation enables students to create molecules with different numbers of atoms in them and to adjust the electronegativity of each atom in the molecule. Students can also view the partial charge of each side of the molecule, the electrostatic potential across the molecule, and the bond character.

CHEM-02: Molecular Shapes

Guiding Question: How does the number of substituents around a central atom affect the shape of a molecule?

Goal: The students' goal in this investigation is to develop a rule that they can use to predict the shape of a molecule based on the number of atoms and lone electron pairs (i.e., substituents) around a central atom.

Lab Description: The simulation models how the number of atoms and lone electron pairs around a central atom affect the shape of a molecule. With this simulation, students can decide how many atoms are found in the molecule, the nature of the bonds found between the atoms (single, double, or triple), and the number of lone electron pairs that are found around the central atom.

CHEM-03: Molarity

Guiding Question: What is the mathematical relationship between the moles of a solute, the volume of the solvent, and the molarity of an aqueous solution?

Goal: The students' goal in this investigation is to use a computer simulation to determine the mathematical relationship between moles of solute, volume of solvent, and molarity.

Lab Description: The simulation will allow students to adjust the amount of solute and solvent in a solution and observe changes in the solution molarity.

CHEM-04: Gas Laws

Guiding Question: How does changing the volume or temperature of a gas affect the pressure of that gas?

Goal: The students' goal in this investigation is to determine how changes to the volume and the temperature of a gas within a closed system affect the pressure of that gas, and to express that change using a mathematical model.

Lab Description: The simulation allows students to pump gas molecules into a container and measure the pressure of the gas. Students can also change the volume of the container and the temperature of the gas in the container.

CHEM-05: States of Matter

Guiding Question: Why do substances change from one state to another at different temperatures?

Goal: The students' goal in this investigation is to figure out why substances, such as carbon dioxide and water, change from one state to another at a different temperature and sometimes in unexpected ways.

Lab Description: The simulation will allow students to view the behavior of molecules of argon, neon, oxygen, and water when they are in particular states. They can also add and remove thermal energy to observe differences in the ways that molecules move between states of matter.

CHEM-06: Acids and Bases

Guiding Question: How can the properties of an aqueous solution be used to identify it as an acid or a base?

Goal: The students' goal in this investigation is to explore some of the unique chemical properties of acids and bases. They will then develop a method that can be used to identify acidic or basic aqueous solutions.

Lab Description: The simulation will allow students to use different tools such as a pH meter, litmus paper, and a simple circuit to test the properties of acids and bases.

CHEM-07: Reaction Rates

Guiding Question: Why do changes in temperature and reactant concentration affect the rate of a reaction?

Goal: The students' goal in this investigation is to first figure out how changes in temperature and reactant concentration affect the rate of a reaction. They will then use what they figured out to develop a conceptual model that they can use to explain why these two factors affect the rate of a reaction.

Lab Description: The simulation will allow students to observe a chemical reaction on the molecular level as they change the concentration of the reactant and/or the temperature of the reaction to see how quickly the reaction reaches a steady state.

CHEM-08: Chemical Equilibrium

Guiding Question: Why do changes in reactant concentration and product concentration affect the equilibrium point of a reaction?

Goal: The students' goal in this investigation is to use a computer simulation to determine how the addition of extra reactants and products affect the equilibrium point of a reaction. Then they will develop a conceptual model that they can use to explain why these factors influence the equilibrium point of a reaction.

Lab Description: The simulation will allow students to observe a chemical reaction on the molecular level to see how the equilibrium point is affected when they change different factors, such as reactant concentration and product concentration.

CHEM-09: Periodic Trends

Guiding Question: What are the properties of two unknown elements?

Goal: The students' goal in this investigation is to figure out the properties of two unknown elements based on the properties of the 30 known elements.

Lab Description: Students will use 32 element information cards to create their own periodic table. Students must arrange the cards in a way that will allow them to predict the properties of elements based on where they are located in their periodic table. Students can then use any periodic trends in their table to determine the properties of the two unknown elements.

CHEM-10: Stoichiometry

Guiding Question: Which balanced chemical reaction equation best represents the thermal decomposition of sodium bicarbonate?

Goal: The students' goal in this investigation is to determine which of four balanced chemical reaction equations best represents how atoms are rearranged during the thermal decomposition of sodium bicarbonate.

Lab Description: Students will watch a video that shows the thermal decomposition of sodium bicarbonate. This video will include information about how the mass of the sample changes as it is heated. They will then compare this information to four chemical equations and use stoichiometry to determine which equation best represents what happened.

CHEM-11: Heat of Solution

Guiding Question: How can chemists use the properties of a solute to predict if an enthalpy change of solution will be exothermic or endothermic?

Goal: The students' goal in this investigation is to develop a rule that chemists can use to determine if the enthalpy change of solution (∆Hsolution) for a given ionic compound in water will be endothermic or exothermic based on the properties of the solute.

Lab Description: Students will be given short videos of how temperature changes when different ionic compounds are added to water in an insulated container. Then they will compare this to a table of ∆Hdissociation and ∆Hhydration values to figure out how to predict if the ∆Hsolution of an ionic compound will be endothermic or exothermic.

CHEM-12: Reaction Products

Guiding Question: Which combinations of solutions produced a new substance when they were mixed and what is the balanced chemical reaction equation for those reactions?

Goal: The students' goal in this investigation is to determine which of six combinations of solutions resulted in a chemical reaction. They must then determine the identity of the products of the reaction.

Lab Description: Students will watch a video of six different chemical reactions to determine which had a chemical change, and then use what they know about ions and ionic compounds and types of chemical reactions to determine the identity of the products.