What type of change takes place in the following, physical or chemical? Briefly explain.
a) Heating of zinc oxides
b) Action of sodium with water
c) Rusting of iron
d) Heating calcium carbonate
e) Action of dilute acids on magnesium
Answers
Answer:
a = physical
b= physical
c= chemical
d= physical
e= chemical
Answer:
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Page No: 6
1. Why should a magnesium ribbon be cleaned before it is burnt in air?
Ans: Magnesium is an very reactive metal. When stored, it reacts with oxygen to form a layer of magnesium oxide on its surface. This layer of magnesium oxide is quite stable and prevents further reaction of magnesium with oxygen. The magnesium ribbon is cleaned by sand paper for removing this layer so that the underlying metal can be expose.