Reaction Lab

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Reaction lab
Distinguishing between single displacement, double displacement, composition and decomposition reactions

Teacher Background Information:
This lab discusses types of reactions and replaces traditional reactions involving chemicals such as lead (II) nitrate, barium chloride, and silver nitrate.

This lab is designed to challenge students to be able to identify types of chemical reactions and distinguish between them using safe, less hazardous chemicals. Students will make a choice as to which reaction they will perform using the principles of Green Chemistry. Students will ultimately learn the difference between composition, decomposition, single displacement and double displacement reactions.

Safety Information:
Hydrochloric acid at lower concentrations is a skin irritant and if it comes into contact with the skin it should be washed with soap and water. Copper (II) sulfate is a skin irritant and if it comes into contact with the skin should be washed with soap and water. Reaction Type C includes using a wooden splint to test for the generation of gases, which involves the use of matches in the classroom; proper safety using matches should be practiced. Part D involves the use of a Bunsen burner, use proper laboratory safety when using the Bunsen burner.

Educational Goals: Students will understand…
● How to distinguish between a single displacement, double displacement, composition and decomposition reaction ● How to observe reactions and predict the product
● How to critique chemical reactions using the 12 principles of green chemistry and compare their hazards

Student Objectives: Students will…
• Perform a composition, decomposition, single displacement and double displacement reaction • Make observations of chemical reactions and categorize them • Write and balance chemical equations

• Analyze the reactions against the 12 principles of green chemistry

Materials (per group of 2-3 students):
• Goggles
• 3 test tubes
• steel wool
• 10 mL 1M copper (II) chloride aqueous solution
• rubber stopper
• 10 mL 1M copper (II) sulfate aqueous solution
• 10 mL 1M potassium carbonate aqueous solution
• 10 mL 1M calcium chloride aqueous solution
• 10 mL hydrogen peroxide (5-6%)
• 10 mL Graduated cylinders (2)
• Catalayse/potato piece
• 3M hydrochloric acid
• Zinc strip or galvanized nail
• Bunsen Burner
• Copper wire
• Crucible tongs
• Test tube rack
• Matches
• Wooden flint

Time required: 1 x 60-75 minute class periods

Prerequisites: An understanding of the 12 principles of green chemistry

National Science Standards Met: S1, S2, S3, S6, S7, S8

Green Chemistry Principles Addressed:
Pollution Prevention ¤ Atom Economy ¤ Less Hazardous Chemical Syntheses ¤ Designing Safer Chemicals ¤ Safer Solvents and Auxiliaries ¤ Use of Renewable Feedstock ¤ Catalysis ¤ Design for Degradation ¤ Inherently Safer Chemistry for Accident Prevention

Teacher Prep: Teachers should prepare…
● 1M aqueous solution of copper (II) chloride (CuCl2 FW = 138.55 g/mol) Hint: To prepare 100 mL of 1M aqueous solution of copper (II) chloride, dissolve 13.86 g CuCl2 in 100mL of water. ● 1M aqueous solution of copper (II) sulfate (CuSO4 FW = 159.62 g/mol) Hint: To prepare 100 mL of 1M aqueous solution of copper (II) sulfate, dissolve 15.96 g CuSO4 in 100 mL of water. ● 1M aqueous solution of potassium carbonate (K2CO3 FW = 138.21 g/mol) Hint: To prepare 100 mL of 1M aqueous solution of potassium carbonate, dissolve 13.82 g K2CO3 in 100 mL of water. ● 1M aqueous solution of calcium chloride (CaCl2 FW = 110.98 g/mol) Hint: To prepare 100 mL of 1M aqueous solution of calcium chloride, dissolve 11.1 g CaCl2 in 100 mL of water. ● Potato catalayse: Cut up a potato in small pieces (about ¼ inch cubes; this does not have to be exact)

Procedure:...
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