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FAQs on Elements and Compounds - Is matter around us Pure, Class 9, Science

1. What is the difference between an element and a compound?
Ans. An element is a pure substance that cannot be broken down into simpler substances by chemical methods. It is made up of only one type of atom. On the other hand, a compound is a pure substance composed of two or more different elements chemically combined in a fixed ratio. Compounds have different properties compared to their constituent elements.
2. How can we determine if a substance is an element or a compound?
Ans. We can determine if a substance is an element or a compound by conducting a chemical analysis. If the substance consists of only one type of atom, it is an element. If the substance can be broken down into simpler substances through chemical reactions, it is a compound. The presence of different elements in a substance indicates that it is a compound.
3. Are all substances around us pure?
Ans. No, not all substances around us are pure. Most substances in our surroundings are mixtures of different components. A pure substance consists of only one type of substance and cannot be separated into other substances by physical methods. Mixtures, on the other hand, are combinations of two or more pure substances that can be separated using physical methods.
4. Why are elements and compounds considered pure substances?
Ans. Elements and compounds are considered pure substances because they are composed of only one type of substance. Elements consist of atoms of the same type, while compounds consist of molecules or ions of different elements combined in a fixed ratio. These substances have definite chemical and physical properties that are characteristic of their composition, making them pure in nature.
5. How do elements and compounds differ in terms of their properties?
Ans. Elements and compounds differ in terms of their properties. Elements have characteristic physical and chemical properties that are unique to each element. For example, oxygen is a gas at room temperature, while iron is a solid. Compounds, on the other hand, have properties different from their constituent elements. For instance, sodium is a highly reactive metal, while chlorine is a poisonous gas, but when combined to form sodium chloride (table salt), it becomes a stable compound.
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