Concept explainers
(a)
Interpretation:
Whether calcium chloride is a pure substance or not is to be explained.
Concept introduction:
A substance composed of only one kind of an element or a compound can be defined as a pure substance. A pure substance has a uniform composition and properties in all the parts. A compound which is chemically pure has a specific melting and boiling point.
An impure substance is a mixture of two or more different elements or compounds or elements and compound. It has no definite composition and properties. The constituents are not
(b)
Interpretation:
Whether the octatomic molecule of sulfur is a pure substance or not is to be determined.
Concept introduction:
A substance composed of only one kind of an element or a compound can be defined as a pure substance. A pure substance has a uniform composition and properties in all the parts. A compound which is chemically pure has a specific melting and boiling point.
An impure substance is a mixture of two or more different elements or compounds or elements and compound. It has no definite composition and properties. The constituents are not chemically bonded to one another.
(c)
Interpretation:
Whether baking powder composed of
Concept introduction:
A substance composed of only one kind of an element or a compound can be defined as a pure substance. A pure substance has a uniform composition and properties in all the parts. A compound which is chemically pure has a specific melting and boiling point.
An impure substance is a mixture of two or more different elements or compounds or elements and compound. It has no definite composition and properties. The constituents are not chemically bonded to one another.
(d)
Interpretation:
Whether cytosine, a component of DNA consisting of H, C, N and O atoms bonded in a specific arrangement, is a pure substance or not, is to be determined.
Concept introduction:
A substance composed of only one kind of an element or a compound can be defined as a pure substance. A pure substance has a uniform composition and properties in all the parts. A compound which is chemically pure has a specific melting and boiling point.
An impure substance is a mixture of two or more different elements or compounds or elements and compound. It has no definite composition and properties. The constituents are not chemically bonded to one another.
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Chemistry The Molecular Nature Of Matter And Change 9th
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