BIOS 111 Chapter 2: BIOS 111 Chapter 2 Vocab/Notes

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7 Feb 2017
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BIOS 111 Chapter 2 Vocab/Notes
Milk turns sour because of lactic acid production
Trees rot because of decomposition
Atom: smallest unit of pure substance that exhibits chemical and physical properties
Molecules: atoms interacting to make combinations
Chemistry: science of interaction between atoms and molecules
Electrons: move around the nucleus in shells
Stable: don’t change spontaneously
Nucleus is made up of protons and neutrons
Charge: a property of subatomic particles that produces an attraction or repulsion
Opposites attract
Atomic number: Protons in the nucleus
Atomic weight: total number of neutrons and protons
Chemical element: atoms of a certain number of protons
Isotopes: atoms with different numbers of neutrons in nuclei but same number of protons
Valence: Combining capacity
Compound: molecule with 2 or more different atoms
Chemical bonds: attractive forces holding together molecule
Atoms form bonds by gaining or losing electrons
Covalent bond: electrons shared
Ion: negatively or positively charged atom
Ionic bond: attraction of ions of opposite charges
Cation: positively charged ions
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