{"id":51648,"date":"2025-09-06T17:57:49","date_gmt":"2025-09-06T08:57:49","guid":{"rendered":"https:\/\/phys-edu.net\/wp\/?p=51648"},"modified":"2025-09-06T17:58:33","modified_gmt":"2025-09-06T08:58:33","slug":"mixing-is-the-secret-soybean-sized-copper-in-the-copper-oxide-reduction-experiment","status":"publish","type":"post","link":"https:\/\/phys-edu.net\/wp\/?p=51648&lang=en","title":{"rendered":"Mixing Is the Secret! Soybean-Sized Copper in the Copper Oxide Reduction Experiment"},"content":{"rendered":"

Hi, I’m Ken Kuwako, a science trainer. Every day is an experiment! <\/p>\n

\u3010The Magic of Chemistry!\u3011Get that “Red Glow” with a Copper Oxide Reduction Experiment<\/span><\/strong><\/p>\n

When teaching “metal refining” in middle school science, one of the most engaging experiments is the reduction of copper oxide. The visual impact of “a red metal appearing from a black powder!” combined with the moment the reaction “flashes with a bright red glow” is truly the highlight of chemistry. This article shares a practical guide full of tips and tricks for success, based on my own experience teaching this experiment. From preparation to cleanup, I hope this helps you plan your own class.<\/span><\/p>\n

\u25bc Experiment Objective and Overview<\/p>\n

Objective: Heat a mixture of copper oxide (CuO) and carbon to extract copper through a reduction reaction<\/p>\n

Chemical Equation: 2CuO \uff0b C \u2192 2Cu \uff0b CO\u2082\u2191<\/strong><\/p>\n

Materials:<\/strong><\/p>\n

Safety goggles, lab coat, copper oxide, carbon, limewater, glass tube with rubber stopper, mortar and pestle, test tube stand, 50mL beaker, gas burner, pinchcock, rubber tubing, scoopula, stand, matches, waste container, stirring rod<\/p>\n

\u25bc Lesson Preparation and Required Materials<\/p>\n

What the teacher needs to prepare in advance
\n\u2022 Prepare individual packets with 2g of copper oxide (CuO) and 0.2g of carbon powder
\n\u2022 Designate a mortar for copper oxide only and store it separately (This makes it easy to recover the powder without washing it)<\/p>\n

Student lab equipment (per group)
\n\u2022 Copper oxide, carbon, mortar, pestle, test tube (heat-resistant), rubber stopper (with glass tube), pinchcock
\n\u2022 Limewater, beaker (50mL), stand, gas burner, matches, scoopula, stirring rod
\n\u2022 Test tube stand, waste container, filter paper, conductivity checker (for metal identification), etc.<\/p>\n

Teacher’s Pre-prepared Materials:<\/strong><\/p>\n

Use an electronic balance to measure out the copper oxide (\u2161) CuO (2g) and carbon (0.2g), and place them in separate weighing papers.<\/p>\n

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Mix 2g of copper oxide (\u2161) CuO and 0.2g of carbon well in the mortar and transfer the mixture to a test tube. Theoretically, the ratio of copper oxide to oxygen is 2:0.15. The mixture should be spread out a little at the bottom of the test tube, not packed down. For more details, this video is a great reference.<\/p>\n

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Next, use the scoopula to pour the mixture onto the weighing paper, then use the paper to carefully funnel it into the test tube.<\/p>\n

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Important: Mix thoroughly and spread it out a bit.<\/strong><\/p>\n