# data[].attributes.headline
The material can be divided into 2 categories

# data[].attributes.subject
The material can be divided into 2 categories

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It has unique characteristic properties

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Formed by 2 or more substances, in different proportions

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Atoms equal to each other

Ex: Nitrogen, neon, oxygen, iron, carbon, helium...

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Made up of different types of atoms

Ex: H₂O →Oxygen + Hydrogen

# data[].attributes.headline
They can’t be separated by physical methods

# data[].attributes.subject
They can’t be separated by physical methods

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Its components are indistinguishable

Ex: Water with salt

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We can recognize its components by looking at it normally.

Ex: Oil and water

# data[].attributes.headline
They can be separated by phisical methods

# data[].attributes.subject
They can be separated by phisical methods

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Ex: Ice

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Ex: Water

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Ex: Clouds