PreparED Study Materials
CHEM 40982: General Chemistry I/ Lab
School: University of St. Thomas
Number of Notes and Study Guides Available: 1
Notes
Videos
Element Classification: Rep, Trans, Inner-Trans, Noble Gases
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We categorize elements into representative, transition, inner-transition, and noble gases based on their positions in the periodic table and general characteristics, without revealing specific element classifications.
Intermolecular Forces: Comparing Properties of Key Chemical Compounds
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Discover the effects of intermolecular forces on the boiling point, freezing point, and vapor pressure of various compounds. Learn how hydrogen bonding, ionic bonding, and London dispersion forces influence these properties in different groups of molecules.
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Physical vs Chemical Changes: Understanding Reactions & Transformation
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Discover the differences between physical and chemical changes using common examples. Understand how sugar reacts in various scenarios, and how metals undergo changes, either maintaining their substance or forming new compounds.
Animal and Plant Energy Storage: Fats and Oils Explained
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This video delves into the fascinating world of energy storage in animals and plants, offering insights into why fats are the primary energy storage compound in animals (except muscles) and why plants opt for alternative strategies instead of using fats and oils.
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







