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Heating Crystals
Rubric
MARK SCHEME        
         
a) P Green crystals turn white/changes color  
1
    Crystals go to powder  
1
    Vapor (water)  
1
  Q Blue crystals turn white/changes color  
1
    Crystals go to powder  
1
    Vapor (water)  
1
  R Green crystals turn white yellow/cream/changes color  
1
    Crystals go to powder  
1
    Vapor (water)  
1
      Subtotal
9
         
b)   Loss of color (or changed color)  
1
    Loss of crystalline form  
1
    Water vapor given off  
1
      Subtotal
3
      Total
12

 


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