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1.1 Introduction to the particulate nature of matter
Understanding Points |
Structure 1.1.1—Elements are the primary constituents of matter, which cannot be chemically broken down into simpler substances.
Compounds consist of atoms of different elements chemically bonded together in a fixed ratio. Mixtures contain more than one element or compound in no fixed ratio, which are not chemically bonded and so can be separated by physical methods. |
Structure 1.1.2—The kinetic molecular theory is a model to explain physical properties of matter
(solids, liquids and gases) and changes of state. |
Structure 1.1.3—The temperature, T, in Kelvin (K) is a measure of average kinetic energy Ek of
particles. |
Atom: basic building block of matter that can neither be created nor destroyed
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Described in Dalton's Atomic Theory
Element: a chemical species that cannot be further decomposed by chemical reaction
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Elements have the same number of protons in their nuclei
S1. Models of the particulate nature of matter
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