Explain the observation of activity 3.9 of science class 10
Answers
Activity 3.9 Page No. 41
CAUTION: The following activity needs the teacher’s assistance. It would be better if students wear eye protection.
Hold any of the samples taken above with a pair of tongs and try burning over a flame. Repeat with the other metal samples.
Collect the product if formed.
Let the products and the metal surface cool down.
Which metals burn easily?
Answer. Magnesium
What flame colour did you observe when the metal burnt?
Answer. Blue
How does the metal surface appear after burning?
Answer. Silver white.
Arrange the metals in the decreasing order of their reactivity towards oxygen.
Answer. Na > Mg > Al > Zn > Fe > Pb > Copper
Are the products soluble in water?
Answer. . Oxides of Alumium,Copper, Iron, Lead, Mg, Zn are not Soluble. Soudium Oxide is soluble in water
Answer:
Explanation:
Activity 3.9 Page No. 41
Which metals burn easily?
Answer. Magnesium
What flame colour did you observe when the metal burnt?
Answer. Blue
How does the metal surface appear after burning?
Answer. Silver white.
Arrange the metals in the decreasing order of their reactivity towards oxygen.
Answer. Na > Mg > Al > Zn > Fe > Pb > Copper
Are the products soluble in water?
Answer. . Oxides of Alumium,Copper, Iron, Lead, Mg, Zn are not Soluble. Soudium Oxide is soluble in water
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