(a)
Interpretation: To identify ‘melting of iron’ a physical change or chemical change
Concept introduction:
When one chemical substance is converted into one or more distinct chemicals, this is known as a chemical transformation. Physical change is defined as a typically reversible alteration of a substance's physical characteristics, such as its size or shape.
(a)
Answer to Problem 85A
Physical change
Explanation of Solution
In the melting of iron, no new substance is formed only the state of the substance is changed. A solid iron rod is converted into a liquid state and this process is reversible also.
Thus, the melting of iron is a physical process.
(b)
Interpretation: To identify ‘lighting a match’ a physical change or chemical change
Concept introduction:
When one chemical substance is converted into one or more distinct chemicals, this is known as a chemical transformation. Physical change is defined as a typically reversible alteration of a substance's physical characteristics, such as its size or shape.
(b)
Answer to Problem 85A
Chemical change
Explanation of Solution
In the lighting of a match, a
Thus, lighting a match is a chemical process.
(c)
Interpretation: To identify ‘grinding a corn’ a physical change or chemical change
Concept introduction:
When one chemical substance is converted into one or more distinct chemicals, this is known as a chemical transformation. Physical change is defined as a typically reversible alteration of a substance's physical characteristics, such as its size or shape.
(c)
Answer to Problem 85A
Chemical change
Explanation of Solution
Physical change is reversible while chemical change is irreversible. When corn is ground, it changes into a powder form which cannot be converted back to corn.
Thus, grinding corn is a chemical change.
(d)
Interpretation: To identify ‘souring of milk’ a physical change or chemical change
Concept introduction:
When one chemical substance is converted into one or more distinct chemicals, this is known as a chemical transformation. Physical change is defined as a typically reversible alteration of a substance's physical characteristics, such as its size or shape.
(d)
Answer to Problem 85A
Chemical change
Explanation of Solution
Physical change is reversible while chemical change is irreversible. The Souring of milk is a chemical change. Because lactic acid is produced due to milk sourness, it is referred to be a chemical change.
Thus, ‘souring of milk’ is a chemical change.
Chapter 6 Solutions
Chemistry 2012 Student Edition (hard Cover) Grade 11
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