Basic Chemistry Concepts Explained
Classified in Chemistry
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Classifying Matter
- Pure Substance: Element or compound.
- Mixture: Homogeneous (uniform) or heterogeneous (non-uniform).
- Element: One type of atom.
- Compound: Two or more atoms chemically bonded.
Properties of Matter
- Physical: Observable without changing the substance (e.g., color, density).
- Chemical: Describes the potential for a substance to change (e.g., reactivity).
- Physical Change: No new substance is formed (e.g., melting).
- Chemical Change: A new substance is formed (e.g., burning).
Atomic Structure
Protons, Neutrons, Electrons (PEN)
- Protons: Positive charge (+1), located in the nucleus.
- Neutrons: No charge (0), located in the nucleus.
- Electrons: Negative charge (-1), located in shells around the nucleus.
- PEN Relationships:
- Protons = Atomic number.
- Neutrons