Pure Substances: Elements and Compounds

Pure substances can be elements or compounds.

Elements are made up of one type of atom.

The gas phase of an element may be made up of independent atoms or clusters of atoms called molecules.

Elements: Atoms, Compounds: Molecules

How many atoms?

How many types of atoms?

How many atoms?

How many types of atoms?

How many atoms?

How many types of atoms?

How many atoms?

How many types of atoms?

Elements: Atoms, Compounds: Molecules

How many atoms?

How many types of atoms?

How many molecules?

How many types of molecules?

How many atoms?

How many types of atoms?

How many molecules?

How many types of molecules?

How many atoms?

How many types of atoms?

How many molecules?

How many types of molecules?

How many atoms?

How many types of atoms?

How many molecules?

How many types of molecules?

Elements: Atoms, Compounds: Molecules

How many atoms?

How many types of atoms?

How many molecules?

How many types of molecules?

How many atoms?

How many types of atoms?

How many molecules?

How many types of molecules?

How many atoms?

How many types of atoms?

How many molecules?

How many types of molecules?

How many atoms?

How many types of atoms?

How many molecules?

How many types of molecules?

Summary

Elements: A pure substances made of only one type of atom.

Atoms: The smallest building block of ordinary matter.

Compounds: A pure substances made of more than one type of atom.

Molecules: The smallest building block of compounds.

Pure samples of elements like oxygen are be made up of molecules.

Pure samples of compounds like helium are be made up of atoms.

Pure Substances and Mixtures

Pure substance or mixture?

Pure substance or mixture?

Pure substance or mixture?

Pure substance or mixture?

Pure Substances and Mixtures

Pure substance or mixture?

Pure substance or mixture?

Pure substance or mixture?

Pure substance or mixture?

Pure Substances and Mixtures

Pure substance or mixture?

Pure substance or mixture?

Pure substance or mixture?

Pure substance or mixture?

Summary

Substance: A sample of matter made up of only one type of atom (one element), or only one type of molecule (one compound).

Mixture: A sample of matter made up of two or more substances. (More than one type of atom or more than one type of molecule.)

Writing Symbols (include coefficients)

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Writing Symbols (include coefficients)

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Writing Symbols (include coefficients)

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Writing Formulas (include coefficients)

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Writing Formulas (include coefficients)

Write formula(s).

Write formula(s).

Write formula(s).

Write formula(s).

Elements, Compounds, and Mixtures

Identify sample as element, compound, or mixture.

Identify sample as element, compound, or mixture.

Identify sample as element, compound, or mixture.

Identify sample as element, compound, or mixture.