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Chemical reaction between metals and water/acid

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Explaining some of the reactions between metals/water and metals/acid (high school science)

Explaining some of the reactions between metals/water and metals/acid (high school science)


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  • 1. Jacques Zeefenbergen © 2012
  • 2. Some metals react very quickly and easy with acids. Normally, “light” metals react vigorously with acids.However, some metals react slowerwith acids. The heavier a metal gets, the slower and more difficult the reaction eg. Light metals Na, K, Ca eg. Heavier metals Mg, Al, Zn, Pb2012 Jacques Zeefenbergen ©
  • 3. Diluted acid is acid mixed with a bit ofwater (to make the solution weaker).The acid will be in the aqueous state. eg. HCl(aq) Concentrated acid is strong and pure. It is NOT mixed with water eg. HCl(l) Jacques Zeefenbergen © 2012
  • 4. Most reactions between metals and diluted acids are SINGLEREPLACEMENT reactions (a metal will replace the hydrogen of the acid). During the reaction, hydrogen gas is released as a product. H2 (g) Jacques Zeefenbergen © 2012
  • 5. Examples of reaction between metals and acids:Ca(s) + 2 HCl (aq)  CaCl2 (aq) + H2 (g) 2 Al + 6 HNO3 (aq)  2 Al(NO3)3 (aq) + 3 H2 (g) Jacques Zeefenbergen © 2012
  • 6. Most reactions between metals andconcentrated acids are a combination of SINGLE REPLACEMENT and DECOMPOSITION reactions(a metal will replace the hydrogen of the acid AND some nitrate will decompose) Jacques Zeefenbergen © 2012
  • 7. Reaction between metals and concentrated acids acids: Cu(s) + 4 HNO3 (l) Cu(NO3)2 (aq) + 2 NO2 (g) + 2H2O (l) Jacques Zeefenbergen © 2012
  • 8. Jacques Zeefenbergen © 2012
  • 9. Some metals react very quickly and easy with water. Normally, “light” metals react vigorously with water. However, some metals react slower with water. The heavier a metal gets, the slower and more difficult thereaction. Water can have more energy if it heats up. The more energy water has, the better the reaction © 2012 Jacques Zeefenbergen
  • 10. Examples of reaction between metals and cold water: 2Na (s) + 2H2O (l)  2 NaOH (aq) + H2 (g)So, metals + cold water (H2O (l)) givehydroxide and hydrogen gas (H2 (g)) Jacques Zeefenbergen © 2012
  • 11. Examples of reaction between metals and steam: Mg (s) + H2O (g)  MgO (s) + H2 (g) So, metals + steam(H2O (g)) give ametal oxide and hydrogen gas (H2 (g)) Jacques Zeefenbergen © 2012