CH115 chapter 2

CH115 chapter 2 - What is chemistry? Chemistry is the study...

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What is chemistry? Chemistry is the study of matter and its tranformations
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Atomic theory All matter is composed of atoms All atoms of a particular element have the same chemical properties Compounds are formed by the chemical combination of two or more different kinds of atoms A chemical reaction involves joining, separating or rearranging atoms
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So what are atoms? Atoms are made of 3 kinds of particles Protons Electrons Neutrons + - + - - nucleus
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Sub-atomic particles Mass of sub-atomic particles Proton = 1.67262129 × 10 -24 g Neutron = 1.67492728 × 10 -24 g Electron = 9.1093826 × 10 -28 g Charges of sub-atomic particles Proton = +1 Neutron = 0 Electron = -1
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+ The nucleus and electrons + + - - - - The total number of protons and neutrons form the atom’s nucleus The nucleus is at the atom’s center and makes up most of the atom’s mass The electrons orbit the nucleus and their orbits account for most of the atom’s volume
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Elements 1 H Hydrogen 1.0079 Elements are defined by their atomic number Atomic number ( Z ) – The number of protons in an atom’s nucleus
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Atoms vs. Ions
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CH115 chapter 2 - What is chemistry? Chemistry is the study...

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