GK
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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elements and compounds
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mixtures and solutions
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homogeneous and heterogeneous
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chemical and physical
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Detailed explanation-1: -An element is a pure substance which consists of identical atoms or molecules with only one core of an atom. A compound is a pure substance which consists of identical atoms or molecules with two or more different types of atomic core bound together.
Detailed explanation-2: -Pure substances may be divided into two classes: elements and compounds.
Detailed explanation-3: -Examples of elements include carbon, oxygen, hydrogen, gold, silver and iron. Each element is made up of just one type of atom. An atom is the smallest particle of an element that still characterizes the element.
Detailed explanation-4: -Elements and compounds are pure substances because their composition is always fixed, and their constituents can only be separated using chemical or electrochemical reactions.
Detailed explanation-5: -A compound is a chemical substance made up of two or more elements. Here is a list of examples of compounds made up of exactly two elements. Note: A compound that consists of two elements may contain more than two atoms!