(a)
Interpretation:
Reaction of calcium carbonate and sulfuric acid must be classified as physical or chemical change with reason.
Concept Introduction :
In chemical change, new substances are generated which have different physical and chemical properties. In physical change, the appearance of the substances change keeping the chemical properties same.
(a)
Answer to Problem 6E
Reaction of calcium carbonate and sulfuric acid is a chemical change.
Explanation of Solution
The reaction is represented as follows:
CaCO3(s) +H2SO4(aq) →CaSO4(aq) +CO2(g) +H2O (l)
In this reaction, new substances like calcium sulfate, carbon dioxide and water are generated from calcium carbonate and sulfuric acid. Thus, it is a chemical change.
(b)
Interpretation:
Melting of sodium chloride must be classified as physical or chemical change with reason.
Concept Introduction :
In chemical change new substances are generated which have different physical and chemical properties. In physical change, the appearance of the substances change keeping the chemical properties same.
(b)
Answer to Problem 6E
Melting of sodium chloride is a physical change.
Explanation of Solution
In melting of a solid, the intermolecular force is reduced and intermolecular distance is increased due to addition of thermal energy. Arrangements of atoms are changed. The lattice of NaCl(s) is broken. In this case, no chemical properties of NaCl are changed. Thus, it is a physical change.
Chapter U4 Solutions
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