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C HAPTER 2 Section 1 Classifying Matter
W HAT IS MATTER ? Matter- anything that has mass and takes up space Examples Desks You Chair Paper Stars
T HINGS THAT ARE NOT MADE OF MATTER Sound Light Energy Empty Space
C LASSIFYING M ATTER All matter can be classified as An element A compound A mixture
E LEMENTS Elements are substances that cannot be broken down into simpler substances by chemical means Examples Carbon (C) Oxygen (O) Nitrogen (N)
The smallest unit of an element is an atom. Each element is made up of one type of atom.
A LL ELEMENTS ARE REPRESENTED BY A CHEMICAL SYMBOL The chemical symbol is one or two letters. The first letter is always capital The second letter is always lowercase
W HAT ARE THE CHEMICAL SYMBOLS FOR THE FOLLOWING ELEMENTS ? Carbon Oxygen Nitrogen Nickel Lithium Helium
M OLECULES A chain of atoms linked together If two atoms are chemically bonded, it is a molecule
C OMPOUNDS Compounds are substances made up of atoms of different elements. Each molecule of a compound contains two or more elements that are chemically combined
C OMPOUNDS AND M OLECULES All compounds are molecules Not all molecules are compounds A molecule is only a compound if it is composed of more than one type of atom
C LASSIFY THE FOLLOWING AS A MOLECULE, COMPOUND, OR ELEMENT. C HOOSE ALL THAT APPLY C 4 - Carbon Hydrogen -H 2 Water -H 2 O N- Nitrogen NaCl – Table Salt C 12 H 6 O 12 - Sugar
M IXTURES A combination of substances that are not chemically combined Examples Salt Water Sugar Water Sand
L UCK C HARMS IS AN EXAMPLE OF A MIXTURE
P URE S UBSTANCES A pure substance is matter that has a fixed composition and definite properties All elements and compounds, when by themselves, are pure substances.
E XAMPLES OF P URE S UBSTANCES Nitrogen Oxygen Carbon Dioxide Water Diamonds Sugar
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2.1: C LASSIFYING M ATTER. W HAT IS A PURE SUBSTANCE ? Matter that always has exactly the same composition. Examples: Table Salt and Table Sugar.
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Elements and Compounds. What is an element? A pure substance composed of the same type of atom throughout. Cannot be broken down into simpler substances.
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