oat destroyer

Colligative properties are a classic high-yield topic on the DAT General Chemistry section. Understanding how particle number affects boiling point elevation, freezing point depression, and osmotic pressure is essential for solving many exam questions efficiently. In this video, Dr. Jim Romano...

What effect will adding additional O₂ (g) have on the following equilibrium system once equilibrium is reestablished? 2 CO₂ (g) ⇌ 2 CO (g) + O₂ (g)  ΔH° = −514 kJ a) The concentration of CO (g) will increase b) The concentration of CO₂ (g) will decrease c) The equilibrium constant for the...

Discount word problems are a common source of lost points on the DAT Quantitative Reasoning section. In this video, Prof. Denis Blois walks through a representative discount problem step-by-step, showing how to correctly interpret percentages, compare original and sale prices, and avoid the...

Omar Daraghmeh has several bottles of liquids. Which pair is MOST likely to behave as an IDEAL solution (Raoult’s Law)? Correct Answer: C) Hexane + Heptane

Here is today’s DAT Question of the Day from Dr. Jim Romano. Cobalt(II) chloride hexahydrate is a red-pink, crystalline, water-soluble solid often used as a humidity indicator, in electroplating, and as a catalyst in organic synthesis. At infinite dilution, what is the Van’t Hoff factor...

Tech companies run several promotions during holiday sales. One of those promotions includes a trade-in value for a cell phone. For the older phone, a company gives you a discount equal to one-fourth of the price of the new phone. If the new phone costs $800, the total discount is applied as...

With Valentine’s Day here, we wanted to do something supportive for students preparing for the DAT. We’re hosting a Valentine’s Giveaway and giving away one free DAT or OAT Destroyer book to a student using serious DAT study materials. If the winner already owns the DAT Destroyer, no worries...

DAT Math Question of the Day. Many students ask which DAT study materials actually prepare them for real DAT probability questions. This problem tests a very common DAT trap: finding the median from a frequency table rather than from a simple list. Key idea: You must count employees, not...

In this short video, Prof. Blois explains probability concepts commonly tested on the DAT, focusing on understanding rather than shortcuts. This lesson follows the DAT Destroyer system created by Dr. Jim Romano, which emphasizes true mastery of concepts instead of pattern recognition. 📺 Watch...

Which atom has the smallest first ionization energy? (A) Mg (B) Al (C) Si (D) P (E) He Answer: B — Aluminum This is a classic DAT conceptual exception. Although first ionization energy generally increases from left to right across a period, there is a well-known anomaly between Group 2...

DAT questions often test application, not memorization. Today’s General Chemistry Question of the Day focuses on a molecular geometry application involving a coordination compound. Rather than asking for definitions, this question requires reasoning by analogy to determine how molecular...

Dr. Jim Romano explains enzymes and inhibitors — a high-yield DAT Biology topic that students frequently miss. Watch here: DAT Destroyer Resources: 2026 DAT Destroyer – High-Yield DAT Science Study Guide For free daily help, join the DAT Destroyer Facebook Study Group (Official DAT...

Congratulations to Selena Landry, winner of the 2026 DAT Destroyer giveaway prize at LSU’s Annual Pre-Dent 101 Conference. We were honored to sponsor LSU’s Pre-Dental Society and support students preparing for the DAT. We wish Selena her the very best on her dental school journey. For...

Dr. Romano Question of the Day (General Chemistry): Omar Daraghmeh has an unknown compound that contains C, H and O. If the combustion of 0.255 grams of a sample produces 0.561 grams of CO2 and 0.306 grams of H2O, what is the percent of carbon? Answer and Dr. Romano’s handwritten solution...

High-yield DAT General Chemistry concept. Antimony (Sb) has its outermost electrons in the 5p sublevel. For a p orbital, the azimuthal quantum number is: l = 1 Correct answer: B These quantum number questions are classic DAT test-day traps, and the fastest way to handle them is to...

High yield DAT General Chemistry practice question. Dr. Jim Romano walks through a classic thermochemistry specific heat setup using: ΔH = m c ΔT This is exactly the type of calculation students must be comfortable with on test day. Study smart, understand the formula, and do not...

Dr. Jim Romano explains a high-yield DAT Biology topic: pathogenic bacteria and what students need to know about infection and disease for the exam. Video: DAT Destroyer (Official): 2026 DAT Destroyer – High-Yield DAT Science Study Guide DAT and OAT Classes (Online and In-Person): 2026...

Chelsea Torres carries out an experiment to make aluminum chloride. 2Al + 3Cl₂ → 2AlCl₃ Approximately how many grams of halogen are required to completely consume 13.5 g of aluminum to form this compound? Correct answer: D (53.2 g) Slide 2 shows the full stoichiometry setup and unit...

High-yield DAT General Chemistry topic. In this video, Dr. Jim Romano explains heat of formation calculations step by step and shows how to correctly calculate reaction enthalpy using thermochemical data without falling into common DAT traps. This is a concept students often try to memorize...

Oxidation numbers are a high-yield General Chemistry topic on the DAT and a common source of avoidable mistakes. In this short video, Dr. Jim Romano explains how to assign oxidation numbers step by step and shows how the DAT tests this concept so students do not fall into common traps. This...

As a thank-you to the SDN community, SDN members can use the discount code SDNTake10 for 10% off any single Destroyer book (DAT or OAT). Please note: • The discount applies to individual books only • Bundles are already discounted automatically at checkout, so no additional code is needed for...

Hess’s Law and thermochemistry are high-yield topics on the DAT General Chemistry section and come up frequently on the exam. In this short video, Dr. Jim Romano walks through Hess’s Law step by step and shows how to handle enthalpy changes without getting tripped up by common test-day...

1 gram of an element combines with 0.35 g of oxygen to form X₂O.What is the atomic mass of X? a) 45 b) 23 c) 52 d) 77 e) 100 Correct answer: b) 23 As emphasized in class, this question is not about memorization — it’s about units. You must start with grams and end with g/mol. If the...

DAT Question of the Day 25.0 g of K₂C₂O₄ is reacted with KMnO₄ according to the following chemical equation: 5 K₂C₂O₄ (aq) + 2 KMnO₄ (aq) + 8 H₂O → 10 CO₂ (g) + 2 Mn(OH)₂ (s) + 12 KOH (aq) Given: MW of K₂C₂O₄ = 166.2 g/mol MW of KMnO₄ = 158.04 g/mol Question: How many grams of KMnO₄...

Logarithms are a common source of lost points on the DAT Math section, especially when students rely on memorized rules instead of understanding how logarithms actually behave. In this video, Prof. Blois walks through DAT-style logarithm problems step-by-step, showing: How logarithms are...

Circles and spheres are high-yield geometry topics on the DAT math section and are often tested through word problems involving volume, area, and spatial reasoning. In this short video, Prof Blois walks through a classic DAT-style problem involving circles and spheres, showing how to set it up...

This video walks through a DAT-style Hardy–Weinberg equilibrium problem and shows how to approach population genetics questions efficiently on the DAT. Key points covered: How to identify when Hardy–Weinberg applies Calculating allele and genotype frequencies Common mistakes students make on...

In this video, Dr. Jim Romano explains the reticuloendothelial system and how it is tested on the DAT and OAT. The focus is on macrophages, phagocytosis, and immune system function—areas that commonly confuse students in DAT Biology. This explanation is useful for students using the DAT...

Hi everyone — wanted to share a quick video walkthrough on an important QR topic that many students struggle with: Comparison Word Problems This video breaks down how to approach DAT-style comparison problems step-by-step so you can avoid timing traps and avoid common mistakes. YouTube 📹...

#DAT Question of the Day.... Identify the structures indicated by the arrows. a) Secretory granules b) Ribosomes c) Lipid droplets d) Lysosomes e) Glycogen granules Correct answer: B — Ribosomes Ribosomes are essential cellular machines responsible for protein synthesis. They translate...

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Blood flow and blood vessels are high-yield DAT Biology topics that show up repeatedly on the exam. In this short video, Dr. Jim Romano explains how blood moves through arteries, veins, and capillaries, and how vessel structure relates directly to function — exactly how this material is tested...

General chemistry pH calculations are a high-yield topic on the DAT and OAT, and many students lose points by overthinking the setup. In this short video, Dr. Jim Romano walks through a clear, exam-focused approach to pH calculations so you can recognize the correct method quickly and avoid...

Genetics and Punnett squares are high-yield topics on the DAT and OAT Biology sections. In this video, Dr. Jim Romano walks through inheritance patterns and Punnett square reasoning the way the exam expects you to understand them — focusing on conceptual clarity, not memorization shortcuts...

DAT Question of the Day Alcohol consumption affects multiple neurotransmitter systems. After several drinks, which of the following will be decreased? a) GABA b) Serotonin c) Glutamate d) Dopamine e) Endorphins f) None — all increase Correct Answer: C) Glutamate Alcohol increases...

Nuclear chemistry questions appear on the DAT and OAT General Chemistry sections, and many students lose points by misunderstanding radioactive decay, nuclear equations, and setup. In this short video, Dr. Jim Romano walks through nuclear chemistry step by step, showing how to approach these...

Which of the following proteins is devoid of a quaternary structure? A) Myoglobin B) Keratin C) Hemoglobin D) Immunoglobin E) Collagen F) Two of these G) None of these (See answer below.) Correct Answer: A) Myoglobin Explanation: Myoglobin does not have a quaternary structure because it...

Mr. Rostov invested a sum of money into an index fund that pays 9% interest per year. After 30 years, his gain was $1,326,767.85. Prior to the investment, Mr. Rostov was saving $50 per day from his salary. How long did he have to save to invest the needed amount to obtain those gains? A) 2.5...

Paul has been studying for his exams. For every 3 hours he spends studying Biology, he spends 2 hours studying Chemistry. He did not go to class and spent the entire day in the library. He only got 4 hours of sleep. The next day, he planned to spend the same total amount of time studying...