2 1 properties are used to identify matter
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2.1 Properties are used to identify matter. (6.1 pg 149-152). A property is a characteristic of a substance. There are two kinds of properties: Physical properties can be observed without changing the chemical structure of the substance .

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2.1 Properties are used to identify matter

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2 1 properties are used to identify matter

2.1 Properties are used to identify matter

(6.1 pg 149-152)


2 1 properties are used to identify matter

  • A property is a characteristic of a substance. There are two kinds of properties:

    • Physical properties can be observed without changing the chemical structure of the substance.

    • These include colour, density, and electrical conductivity.


2 1 properties are used to identify matter

  • A property is a characteristic of a substance. There are two kinds of properties:

    • Chemical properties describe a possible chemical change (for example: reacts with water, reacts with oxygen) that a substance may undergo.

    • Chemical changes will produce a new substance with a different set of physical properties.


2 1 properties are used to identify matter

  • Matter can be classified into groups:


2 1 properties are used to identify matter

  • Mixtures are formed when two or more substances are put together, but are not chemically combined


2 1 properties are used to identify matter

  • Pure substances (often called, simply, substances) have identical properties in every sample; e.g. pure table salt purchased in different cities will have identical properties.


2 1 properties are used to identify matter

  • Elements are substances that cannot be broken down into simpler materials.

  • The smallest particles of elements that can exist by themselves are called atoms.


2 1 properties are used to identify matter

  • Compounds are substances, formed from two or more elements, in which the elements are always combined in the same fixed proportions.

  • Hydrogen and oxygen are elements, and water is the compound formed from 2 atoms of hydrogen and 1 atom of oxygen.


2 1 properties are used to identify matter

  • We represent elements with symbols, composed of one or two letters (NEVER more than 2 letters).

  • If the symbol is two letters, only the first is capitalized.


2 1 properties are used to identify matter

  • Certain elements are NEVER found as single atoms in nature – they are listed in Table 1 pg.151.

  • You should know the ‘diatomic seven’.


2 1 properties are used to identify matter

  • Compounds also can be represented with symbols.

  • Because they have more than one type of element they must show the symbols for all the elements that make them. (H2O is 2 H atoms and 1 O atom).

  • The # of atoms is represented by subscripts following the symbol of the element.


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