PreparED Study Materials
Notes
Videos
Unveiling the Water-to-Salt Ratio in Barium Chloride Hydrate
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Explore the process of determining the number of water molecules in a barium chloride hydrate. Through a reaction with sulfuric acid, the video highlights how to derive the formation of barium sulfate and its mass calculations. A comprehensive chemical analysis leads to finding the elusive 'x' value, revealing the water-to-salt ratio.
Disulfur Decafluoride Disproportionation & Sulfur Oxidation States
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This video explains the disproportionation reaction of disulfur decafluoride at 150°C. It teaches you to write a balanced equation for this reaction and give the oxidation state of S in each compound.
Calculating the Mass of a Sucrose Crystal: A Chemistry Insight
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Explore the fascinating world of chemistry as we calculate the mass of a sugar crystal with 1.8 x 10¹? molecules of sucrose. Using the concept of a mole and Avogadro's number, discover how to convert molecular numbers to milligrams. Grasp foundational principles in a clear, engaging format.
Strontium: Deep Dive into Its Isotopes & Atomic Structure
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Discover the step-by-step process of Barium Sulfate formation from the reaction of Barium Chloride with Sodium Sulfate. Learn about molar mass calculations stoichiometry and yield predictions.
Nickel(II) Nitrate Solution Composition Analysis
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In this analysis, we determine the composition of a solution prepared by dissolving 12.15g of nickel(II) nitrate in 175mL of water (density 1.00 g/mL). The mass percent of nickel(II) nitrate is found to be approximately 6.50%, and the mole fraction of nickel(II) ions in the solution is calculated as 0.00672.
Balancing Equations: From Lead Sulfide to Ammonia Reactions
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This video shows you how to balance equations from the reaction of lead(II) sulfide with hydrochloric acid to ammonia's interaction with oxygen. Understand the nuances of atom balancing and grasp the precise stoichiometric relationships.




















