A Colorful Decomposition of a Carbonate Oxidation–Reduction Chemical Demonstration Kit requires students to deduce a chemical reaction leading to color change. Via guided inquiry, students find which reaction occurs and what products form.
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Challenge students to deduce the chemical reaction that leads to dramatic color changes when a sample of copper carbonate is heated. Copper carbonate is added to a flask, and a wine airlock containing bromthymol blue solution is placed on top of the flask. The flask is then heated on a hot plate, decomposing the green copper carbonate to black copper oxide and carbon dioxide gas. The gas bubbles through the bromthymol blue indicator solution, lowering the pH and causing a color change from blue to yellow. Through a series of guided questions, students determine what reaction is occurring and what products form. Teacher Demonstration Notes, reproducible student worksheet and answer sheet are included.
Concepts: Decomposition, gas solubility, indicators.
Time Required: 15 minutes
Correlation to Next Generation Science Standards (NGSS)
Science & Engineering Practices
Constructing explanations and designing solutions
Disciplinary Core Ideas
MS-PS1.B: Chemical Reactions
HS-PS1.B: Chemical Reactions
Stability and change
MS-PS1-2: Analyze and interpret data on the properties of substances before and after the substances interact to determine if a chemical reaction has occurred.
MS-PS1-6: Undertake a design project to construct, test, and modify a device that either releases or absorbs thermal energy by chemical processes.
HS-PS1-2: Construct and revise an explanation for the outcome of a simple chemical reaction based on the outermost electron states of atoms, trends in the periodic table, and knowledge of the patterns of chemical properties.
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.