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Elements --> Pure substances that cannot be broken down into two or more simpler substances by chemical processes.

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Thermal decomposition involves heating a compound strongly to break down compound into element or simpler compound.

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Download Free Android App of "Smart Learning for All" @ https://goo.gl/ZvPxzt Decomposition Reaction. A reaction in which a compound splits up into two or more simpler substances is known as a decomposition reaction. Let us take an example. Ferrous Sulfate. Color of ferrous sulfate crystals is green. Heat the test tube.

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Atoms --> Smallest particles of an element that have chemical properties of that element

--> None reactive elements such as noble gases( helium, argon, krypton, xenon and radon) exist as individual atoms which, thus they are monoatomic elements.

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A mixture is made up of two or more substances that are not chemically combined

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Molecules --> a group of two or more atoms that are chemically combined.

--> Elements such as halogens exist in the air as

diatomic molecules -> combination of two atoms

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Differences between mixture and compound? 

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Differences between mixture and compound? 

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Compounds --> Pure substance containing two or more elements that are chemically combined in a fixed ratio

--> Made up of ions ( electrically charged particles) which carry either positive or negative charges

--> cannot be separated through physical methods

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Element

(composition)

~A compound contains two or more element chemically combined in a fixed ratio.

~The smallest particle in a compound is a molecule of an ion.

(Decomposition)

~A compound can be broken down into element or simple compounds by thermal decomposition or electrolysis .

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--> compounds can be represented through chemical formulas

--> shows the atoms in the compound

--> shows ratio of the different atoms present in the compound

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Involves heating a compound strongly which separates the molecules into its constituent ions