Q1.Differentiate between physical and chemical changes along with example. Q2. What happens when carbon dioxide is passed through lime water? Write a word equation for this process. Q3. Name the metal which is used for galvanizing iron. Q4. Draw a labelled diagram to show reaction between copper sulphate and iron. Do Not say see from google please or ill report you!
Answers
Answer:
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Difference Between Physical and Chemical Change.
Physical Change Chemical Change
A Physical change affects only physical properties i.e. shape, size, etc. Chemical change both physical and chemical properties of the substance including its composition
Explanation:
1. The comparisons and differences between physical and chemical changes are given below along with their examples.
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Difference Between Physical and Chemical Change.
Physical Change Chemical Change
A Physical change affects only physical properties i.e. shape, size, etc. Chemical change both physical and chemical properties of the substance including its composition
2. Carbon dioxide passed into limewater gives a milky solution. This is due to the insoluble suspension of calcium carbonate formed: Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l) ... The milkiness disappears since calcium bicarbonate is water-soluble.
3. Zinc
Zinc is used for galvanising iron.It creates a protective coat of zinc oxide which prevents iron from rusting.
4. Iron is more positive electro than copper. Or it is less reactive than Iron to copper.
It will displaces the Copper in the solution it will deposited with red-brown residue or precipitated as red. So the iron is plunged into a CuSO4.
Fe + CuSO4 ———-> FeSO4 + Cu
Use a positive battery terminal and take an iron strip and connect it to a negative battery terminal
