PreparED Study Materials
CHEM 1110: Gen Chem
School: East Tennessee State University
Number of Notes and Study Guides Available: 18
Notes
Study Guides
Videos
Atomic Radius Trends: Unveiling Periodic Table Secrets
Want To Learn More? To watch the entire video and ALL of the videos in the series:
Discover the intricacies of atomic radius and its trends on the periodic table in this video. Unravel the factors influencing atomic size and explore how elements' positions on the periodic table affect their atomic radii.
Lattice Energy: Always Positive; Hydration Energy: Always Negative
Want To Learn More? To watch the entire video and ALL of the videos in the series:
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
Calculating MgO Mass from Oxygen Gas at STP
Want To Learn More? To watch the entire video and ALL of the videos in the series:
In this video, the problem involves calculating the mass of magnesium oxide (MgO) produced when 14.8 liters of oxygen gas react with magnesium metal according to the chemical equation 2Mg + O2 -> 2MgO. The stoichiometric relationship is used to determine that 0.6607 moles of oxygen gas results in 1.3214 moles of MgO, with a final calculation yielding a mass of 53.25 grams of MgO formed during the reaction at Standard Temperature and Pressure (STP).
Converting Moles to Grams: Aluminum & Chlorine Atomic Mass Breakdown
Want To Learn More? To watch the entire video and ALL of the videos in the series:
"Explore the intricate world of atomic masses using aluminum and chlorine as examples. Understand the concept of 'mole' and its relevance in chemistry. Learn to calculate masses of moles for elements based on atomic weights.