Concept explainers
(a)
Interpretation:
Whether the phenomenon of zinc metal producing a colorless gas in acid is a physical or a chemical change is to be stated.
Concept introduction:
The phenomenon in which matter is rearranged without losing its identity is called a physical change. The phenomenon in which matter changes its form and loses its identity is called a chemical change. A chemical change results from a
(b)
Interpretation:
Whether the phenomenon in which nickel alloys with copper in a
Concept introduction:
The phenomenon in which matter is rearranged without losing its identity is called a physical change. The phenomenon in which matter changes its form and loses its identity is called a chemical change. A chemical change results from a chemical reaction, while a physical change results when matter changes forms but not its chemical identity.
(c)
Interpretation:
Whether the phenomenon of boiling of liquid helium at
Concept introduction:
The phenomenon in which matter is rearranged without losing its identity is called a physical change. The phenomenon in which matter changes its form and loses its identity is called a chemical change. A chemical change results from a chemical reaction, while a physical change results when matter changes forms, but not its chemical identity.
(d)
Interpretation:
Whether the phenomenon of sodium metal reacting with chlorine gas is a physical or a chemical change is to be stated.
Concept introduction:
The phenomenon in which matter is rearranged without losing its identity is called a physical change. The phenomenon in which matter changes its form and loses its identity is called a chemical change. A chemical change results from a chemical reaction, while a physical change results when matter changes forms, but not its chemical identity.
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