CHEM 121: General Chemistry I

In this video, we explore the information that knowledge of the number of protons in a neutral element's atom can provide. Options for determining neutron count, electron count, and identifying the element's name are examined, with a conclusion that it allows us to know both the number of electrons and the element's name.

We explore Lewis structures, which depict atom bonding and lone electron pairs. We create Lewis structures for potassium, barium, aluminum, and bromine by using group numbers in the periodic table to determine their valence electrons.

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

Detailed walkthrough of calculating sulfur dioxide gas volume produced from burning tetraphosphorus trisulfide. Utilizes stoichiometry and the Ideal Gas Law to derive results under specific conditions. Step-by-step guide for understanding chemical reactions and gas volume calculations

Learn the art of precise chemical calculations in this video. Discover how Chromium(III) oxide reacts with hydrogen sulfide to form chromium(III) sulfide and water, all while unraveling the necessary steps to determine the exact quantities involved.

Examine the nature of bonds in methylamine, ethane, fluoromethane, and methanol. Identify ethane's nonpolar covalent bond and understand why fluoromethane's bond leans toward the ionic spectrum. Grasp essential concepts in molecular bonding with this deep analysis.