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Single exchange reaction
Chimica

Single exchange reaction

To demonstrate displacement reactions, resulting in new compounds.

Reazioni e variazioni di energia
displacement reaction; reactivity series; metals

Cosa imparano gli studenti

La scienza alla base di questo esperimento

In a chemical reaction, the atoms of the initial compounds are rearranged to form new compounds. Chemical reactions can be classified as reactions of synthesis, decomposition, exchange or redox.

It is important to note that in single exchange reactions there is a change in the oxidation number of an element, whereas in double exchange there is no change in oxidation numbers.

Attrezzatura utilizzata

  • Provette — 1473,60
  • Portaprovette — 1680.06

Sostanze chimiche e reagenti

  • Hydrochloric acid — R:34-37 S:26-45
  • Silver nitrate — R:34-50/53 S:26-45-60-61
  • Magnesium ribbon — R:11-15 S:78-43
  • Copper wire

Note sulla sicurezza

  • Take care when working with silver nitrate solution: it causes black stains on skin which are extremely difficult to remove.

Domande per gli studenti

  • Describe what happens on putting magnesium ribbon in hydrochloric acid. What is the reaction?
  • Describe what happens on putting the copper wire into the silver ions solution. Try to write the reaction.

Cosa aspettarsi

<p>The magnesium ribbon is quickly covered in bubbles.</p><p>Mg (s) + 2HCl (aq) → MgCl2 (aq)+ H2 (g) ↑.</p><p>After a few minutes the copper coil is covered in silver and the solution turns a pale blue colour.</p><p>2Ag+NO3 (aq)+ Cu (s) →2 Ag(s) + Cu2+(NO3 )2(aq).</p><p>The colour of the solution is the typical colour of aqueous copper complexes.</p>

Smaltimento

Pour the solutions into the liquid wastes container.

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