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This method separates the reaction into two half-reactions – one for oxidation and one for reduction. Each half-reaction is balanced separately and then combined. Best for: complex redox reactions, especially in acidic or basic solutions.
29 lut 2008 · This demonstration involves some fantastic chemistry and makes an excellent introduction to the use of quantitative calculations to find the formula of a reaction product, copper sulfide. Students will also get the chance to see some of the allotropes of sulfur.
1 kwi 2017 · By burying the copper wire with plenty of sulphur and then heating the mix, the wire becomes completely submerged in liquid sulphur. The liquid sulphur then gets to react with the copper, and any oxygen that could possibly oxidise the copper would have to diffuse into the liquid sulphur before reaching the copper.
2 paź 2024 · Study with Quizlet and memorize flashcards containing terms like Does the substance (product) resemble copper?, Is it possible to bend the product without breaking it? Handle it with tongs or forceps?, What color is the product? and more.
Mix the same amount of sulphur and copper powder in a Petri dish. Fill the mixture 0.5 cm high in a test tube. Carefully heat the test tube with the gas burner. If the mixture starts glowing, stop heating.
Redox reactions: Copper metal loses electrons sulfur to fom copper (I) sulfate and to nitric acid to produce copper (II) nitrate and nitric oxide. Replacement reactions: When copper reacts with nitric acid, the hydrogen in the acid is replaced with a copper ion.
In this practical, students add powdered or finely-divided metals to a copper(II) sulfate solution and measure the temperature rises. The experiment reinforces ideas about energy changes during reactions, the reactivity series of the metals and the chemical behaviour of metals.
