Comments on: Science help? http://www.allroofingmaterials.com/metal-roofing-materials/science-help Materials for your roof Thu, 01 Apr 2010 17:57:59 +0000 hourly 1 http://wordpress.org/?v=3.0 By: vinteract11 http://www.allroofingmaterials.com/metal-roofing-materials/science-help/comment-page-1#comment-2004 vinteract11 Sun, 07 Feb 2010 11:18:59 +0000 http://www.allroofingmaterials.com/metal-roofing-materials/science-help#comment-2004 3) a) --->Zinc sulphate + Hydrogen b)--->Sodium Nitrate + Hydrogen c)--->Copper chloride + Hydrogen 3)"The reactivity of a metal is connected with the date when it was discovered" bcoz the noble (rarely reacting) metals like platinum, gold and silver were know since the ancient time as they are always available in free form. Reacting metals are difficult to be obtained, So only chemists can make them by using sophisticated methods.<br><b>References : </b><br> 3)
a) —>Zinc sulphate + Hydrogen
b)—>Sodium Nitrate + Hydrogen
c)—>Copper chloride + Hydrogen

3)"The reactivity of a metal is connected with the date when it was discovered" bcoz the noble (rarely reacting) metals like platinum, gold and silver were know since the ancient time as they are always available in free form. Reacting metals are difficult to be obtained, So only chemists can make them by using sophisticated methods.
References :

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