classify the following as chemical or physical changes (a) formation of manure (b) rusting of an almirah (c) boiling of water to form steam (d) burning of paper (e) dissolving of common salt in water (f) melting of wax
Answers
Answer:
a chemical change
b Chemical change
c physical change
d chemical change
e physical change
f physical change
Explanation:
a) Formation of the manure is the chemical changes. Manure can be produced by the decomposition of the animal excreta and the plant waste.
b) rusting of an almirah is the chemical changes. Rust is the oxide formation of the iron which can be formed on the iron substances like almirah.
c) boiling of water to form steam is the physical change. This is the physical change of the water, from the liquid form to the gaseous form.
d) burning of paper is the chemical changes. In this process the carbon elements of the paper changed to the form of the carbon like carbon dioxide and water vapor.
e) dissolving of common salt in water is the chemical change. In this process NaCl divides into Sodium ion and Cl ion.
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