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Product 40079

By: The Flinn Staff

In this time-saving lab optimized for completion in one period, students systematically vary the concentration of the reactants in order to determine the reaction stoichiometry. A prelab homework assignment intriduces the ideas and concepts needed to succeed on lab day.

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Big Ideas 1 and 3. Transition metals are well known to form colored compounds. Using spectroscopic methods, the concentrations of these complexes in solution can be determined. In this time-saving lab, students systematically vary the concentration of the reactants in order to determine the reaction stoichiometry. A prelab homework assignment introduces the ideas and concepts needed to succeed on lab day. Complete for 24 students working in pairs.

Correlation to Next Generation Science Standards (NGSS)

Science & Engineering Practices

Planning and carrying out investigations
Constructing explanations and designing solutions
Obtaining, evaluation, and communicating information
Analyzing and interpreting data
Using mathematics and computational thinking

Disciplinary Core Ideas

HS-PS1.A: Structure and Properties of Matter
HS-PS2.B: Types of Interactions
HS-ETS1.C: Optimizing the Design Solution
HS-PS3.D: Energy in Chemical Processes
HS-PS4.A: Wave Properties
HS-PS4.B: Electromagnetic Radiation

Crosscutting Concepts

Cause and effect
Patterns
Stability and change
Energy and matter

Performance Expectations

HS-PS1-4: Develop a model to illustrate that the release or absorption of energy from a chemical reaction system depends upon the changes in total bond energy.
HS-PS1-5: Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.
HS-PS1-6: Refine the design of a chemical system by specifying a change in conditions that would produce increased amounts of products at equilibrium.