To write observations & inference

Diagram 1 shows an experiment to study the reactivity of metal P, Q and R when reacts with water within 5 minutes.

 

Rajah I menunjukkan satu eksperimenu ntuk mengkaji kereaktifan logam P, Q dan R apabila bertindakbalas dengan air selama 5 minit. 

• Write down one observation for this experiment. [1 mark] Tuliskan satu pemerhatian bagi eksperimen ini.

            Answer?? (Just choose any observation you can see at the diagram - the easiest is to pick the most obvious reading.. ie: from metal Q)

             

             --> The reaction between metal Q and water produces 30cm3 of hydrogen / gas

or (you can also answer like this - compare between metal Q & metal P)

      

         --> The reaction between metal Q and water produced higer volume of hydrogen / gas compared to the reaction of metal P and water.

But the second answer is longer...

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•  Write down one inference based on the result of this experiment. [1 mark] 
  
  
    Tuliskan satu inferens berdasarkan keputusan eksperimen ini.
  

            Answer?? (Clue - the gas production shows the reactivity of metal)

           --> Metal Q is the most reactive metal when reacts with water

But can you answer like this??

          --> Metal R is the least reactive metal when reacts with water

Well, YES!