Lecture 4 - Mole, Balancing Equations, Enthalpy definitions (1)

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16 Terms

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Mole Definition
The number of atoms in exactly 12.000 g of pure 12C.
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Avogadro's Number
6.022 Ă— 10^23 atoms, which indicates the number of particles in one mole.
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Molar Mass of Iron
The mass of one mole of iron is 55.85 g.
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Polyatomic Ion
A charged species composed of two or more atoms bonded together, such as sulfate (SO4 2-).
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Chemical Reaction
A process of reorganization of reactant molecules to form product molecules, involving breaking and making chemical bonds.
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Endothermic Reaction
A reaction that absorbs heat, resulting in a positive ΔH value.
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Exothermic Reaction
A reaction that releases heat, resulting in a negative ΔH value.
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Diatomic Elements
Elements that exist as molecules made up of two atoms, such as H2, N2, and O2.
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Molecular Formula
A representation of a molecule that indicates the actual numbers and kinds of atoms in a compound.
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Hydrogen Ion (H+)
A positively charged ion formed when a hydrogen atom loses its electron.
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Thiocyanate Ion
A polyatomic ion with the formula SCN-.
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Glucose Formula
The chemical formula for glucose is C6H12O6.
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Mass Percent Composition
The percentage by mass of each element in a compound.
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Conservation of Mass
The principle stating that mass is not lost or gained in a chemical reaction.
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Isotope
Atoms of the same element that have different numbers of neutrons.
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Sulfate Ion
A polyatomic ion with the formula SO4 2-.