Concept explainers
(a)
Interpretation:
Whether the phenomenon of baking soda fizzing in vinegar 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 known as a physical change. The phenomenon in which matter changes its form and loses its identity is known as a chemical change. A chemical change results from a
(b)
Interpretation:
Whether the phenomenon of vinegar and oil separating into two layers 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 known as a physical change. The phenomenon in which matter changes its form and loses its identity is known as 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 heat released by flaming wood log 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 known as a physical change. The phenomenon in which matter changes its form and loses its identity is known as 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 a helium balloon decreasing in size 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 known as a physical change. The phenomenon in which matter changes its form and loses its identity is known as 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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INTRODUCTORY CHEMISTRY-STD.GDE.+SOL.MAN
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