PreparED Study Materials
CHEM 241: Analytical
School: University of North Carolina - Chapel Hill
Number of Notes and Study Guides Available: 5
Notes
Videos
Why Fluorine Can't Form FH? or FCl?: Unpacking VSEPR Theory & Electron
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Explore why fluorine, with its seven valence electrons, doesn't form compounds like FH? or FCl?. Understand the role of VSEPR theory, atomic size, and electronegativity in limiting bond formation. Grasp the interplay of geometric challenges and electron repulsion in compound stability.
Mass Calc: C?F, MgF?, CS? & SO? Explained
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Master the conversion of moles to grams with clear step-by-step guidance. Explore specific calculations for substances like carbon tetrafluoride and magnesium fluoride. Grasp the nuances of handling different units like millimoles and kilomoles in the context of substances such as carbon disulfide and sulfur trioxide
Lattice Energy: Always Positive; Hydration Energy: Always Negative
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In this video we clarify why lattice energy in solids is always a positive value due to the energy needed to separate ions making it an endothermic process. On the flip side hydration energy is always negative as it releases heat when ions dissolve in water making it an exothermic reaction. We use sodium chloride as a real-world example to illustrate these crucial thermodynamic concepts
Comparing pH: Acid Concentrations Strength Ka pKa & pOH Explained!
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Understanding pH Values: In this video we break down the pH levels of various solutions. Discover the importance of acid strengths via Ka and pKa contrast weak vs. strong acids and learn the counterintuitive relationship between pOH and pH.
Chips Nutritional Energy and Body Fat Conversion
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Discover how to calculate the nutritional energy in a bag of chips, and learn the science behind converting excess energy into body fat.
Homogeneous vs Heterogeneous Mixtures: Examples & Classification Expla
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Explore the distinction between homogeneous and heterogeneous mixtures. Through real-world examples like baby oil, chocolate chip cookies, and wine, understand their uniformity, phases, and how components are distributed.