7.P.2A.3 Analyze and interpret data to describe and classify matter as pure substances (elements or compounds) or mixtures (heterogeneous or homogeneous)

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Presentation transcript:

7.P.2A.3 Analyze and interpret data to describe and classify matter as pure substances (elements or compounds) or mixtures (heterogeneous or homogeneous) based on composition.

Elements are pure substances that cannot be changed into simpler substances Elements are composed of one kind of atom Examples: Hydrogen Oxygen Carbon Elements

Compounds are pure substances that are composed of two or more atoms that are chemically combined Compounds can only be changed into simpler substances called elements by chemical changes Compounds

Mixtures are composed of two or more different substances that retain their own individual properties and are combined physically (mixed together) Mixtures can be separated by physical means (filtration, sifting, or evaporation) There are two types of mixtures Mixtures

Heterogeneous Mixtures Not uniform throughout Component substances can be visibly distinguished Examples: Italian salad dressing Chocolate chip cookies Salad Heterogeneous Mixtures

Homogenous Mixtures Uniform throughout Substances are evenly mixed Cannot be visibly distinguished Particles of the substance are so small they cannot be easily seen Another name for a homogenous mixture is a solution Examples: Air Blood Ocean water Homogenous Mixtures