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Decomposition & Displacement

Decomposition & Displacement. http://www.sciencephoto.com/image/4131/large/A5000193-Metal_displacement_reaction-SPL.jpg. Recap. Magnesium, Iron & Hydrochloric Acid Experiment A Bit More On Displacement Decomposition. So What Did We Do?.

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Decomposition & Displacement

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  1. Decomposition & Displacement http://www.sciencephoto.com/image/4131/large/A5000193-Metal_displacement_reaction-SPL.jpg

  2. Recap • Magnesium, Iron & Hydrochloric Acid Experiment • A Bit More On Displacement • Decomposition

  3. So What Did We Do? • Last lesson, we completed a few different reactions. Below is the reaction from Friday. • Step 1 - Mg (s) +2 HCl (aq)  MgCl2 (aq) + H2 (g) • Step 2 –2 Mg (aq) + O2 (g)  2MgO (s) • Step 3 – Fe (s) + O2 (g)  Fe2O3 (s)

  4. Questions • Using this PPT and the PPT from Friday 17th of Feb – write down which type of reaction each step consists of. • In the Magnesium sample, what was the main color of the solid? • Why was there not much red color in the magnesium sample but plenty in the iron nail sample?

  5. Displacement Reactions • Today – we will complete a simple displacement reaction. It’s where we have a not very reactive metal (Copper) which is replaced but a lesser reactive metal (Silver) • As Copper is more reactive, it will become aqueous and replace the Silver.

  6. Decomposition • Silver Nitrate is an interesting chemical. It’s being used as our experiment today. • When left in sunlight – the following equation occurs • AgNO3 (aq)  Ag+ (aq) + NO3- (aq) • Note how it has been broken down into simpler ingredients – we will see this over a week or so

  7. Small Experiment • In groups of 2 or 3 you will need: • A chopstick or pen • Roughly 20cm of Copper Wire • Test Tube & Silver Nitrate • Rubber Stopper • Wrap the Copper Wire like shown by the teacher. Then add Silver Nitrate into the test tube. Close with a Rubber stopper as shown. • Be careful with Silver Nitrate as it stains your skin!

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