To carry out the following reactions and classify them as physical or chemical changes: a) Iron and copper sulphate solution in water b) Burning of magnesium in air c) Zinc with dilute sulphuric acid d) Heating of copper sulphate
Answers
Answer:
a)This is a single displacement reaction in which copper has been displaced by iron from copper sulphate solution and a new compound, ferrous sulphate, is formed. So, this reaction is a chemical change.
b)Burning of magnesium ribbon in air is an example of chemical change. This is because when we burn magnesium ribbon in presence of oxygen it forms magnesium oxide . ... It's chemical composition changes and new substance is formed(magnesium oxide).
c)Zinc reacts with dilute sulphuric acid to produce hydrogen gas (H2) and zinc sulphate. This is an example of displacement reaction of a non-metal by a metal. 4.ZnSO4 is different in chemical composition and chemical properties than Zn and H2SO4 so it is a chemical change.
d)Since water vapor is released and the solid changes color, this should be considered as a chemical reaction, not a physical change. By heating copper(II) sulfate pentahydrate until it was white and contained no more water, you undergo a chemical change.