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Thank you to the students who have trusted DAT Destroyer over the years. We will continue posting FREE high-yield DAT Biology, General Chemistry, and Organic Chemistry videos to help students prepare the right way. Official Channel: DAT Destroyer by Dr. Jim Romano For free daily help, join...

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...

Understanding the equivalence point and half-equivalence point is essential for acid–base titration questions on the DAT and OAT. In this short video, Dr. Jim Romano walks through how to identify and calculate both points, explains what they represent on a titration curve, and highlights...

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...

Many students struggle with DAT Organic Chemistry because they try to memorize reactions instead of understanding reaction mechanisms. In this short video, Dr. Jim Romano explains how to approach DAT Organic Chemistry mechanisms using clear, step-by-step reasoning and DAT-style strategy. The...

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...

=AZZfLUs4A5iKS2TcRZcI0pt9zf5h14VTpiRGmZU8uyze12tZKB62tVVrdRaMacW-G3oMeV4iS_QFX4aOfuzxmjIlYTkVCFlEW_KdnbRvOeBuHbq9d2koeqIVdDGpRu-zz_H62YbHzlnwBcMN02tYR5iV&__tn__=*NK*F']#DAT Question of the DAY.... The below molecule I present shows significant promise in cancer studies for inhibiting cancer...

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...

These hormone associations are high-yield DAT Biology and absolutely fair game on the exam. If you know these concepts cold and pair them with the 2026 DAT Destroyer, you put yourself in a strong position to break into the 500+ range under the new DAT scoring system. 📘 Dr. Romano’s Biology...

The number of carbon atoms in the parent chain when naming this compound by IUPAC is ____________. a) 4 b) 5 c) 6 d) 7 e) None of these Correct Answer: B (5) This one is tricky AF. The longest carbon chain MUST contain the parent functional group. In this problem, the parent...

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...

One of our students was accepted to Stony Brook University School of Dental Medicine. After receiving confirmation from admissions, he shared the following message: Congratulations on a well-earned acceptance. — DAT Destroyer | OAT Destroyer Written by Dr. Jim Romano

DAT-Style Math Question A car costs $42,000 and depreciates in value 8% annually. How long would it take for the car to reach 55% of its original price? A) 8 years and 2 days B) 6 years and 20 days C) 7 years and 73 days D) 3 years and 37 days E) 7 years and 37 days Correct Answer: C Use...

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...

This short video breaks down a DAT Gas Law challenge problem that looks easy on the surface but catches many students off guard on test day. Dr. Jim Romano walks through the setup, strategy, and common mistakes students make with gas law questions under time pressure. Watch here: Gas law...

Here’s a quick review video from Prof. Blois covering how to approach and solve common discount word problems on the DAT. If you’re preparing for the DAT or OAT, math word problems show up often — and learning a clean, structured approach can save valuable time on test day. Prof. Blois...

Let us consider the molecule shown above. After OH⁻ attacks in step 1, how many additional mechanism arrows are required to justify the formation of the product? a) 2 b) 3 c) 4 d) 5 e) 6 f) 7 g) 8 Answer: B Dr. Romano noted that this transformation is another classic “arrow problem,”...

Organic Chemistry Mechanism Arrows Explained (Video) | DAT Destroyer | OAT Destroyer Over the years I’ve seen a lot of students struggle with mechanism arrows in Organic Chemistry. It’s one of those areas where once you understand why electrons move, everything else starts to make sense —...

Here is a geometry practice problem involving an inscribed circle and rectangle. This type of setup is common on the DAT, and recognizing that the width becomes the diameter of the circle is the key step. Full solution included below. Problem: A circle is inscribed within a rectangle so that...

The Math Destroyer Giveaway has officially ended. Congratulations to our winner, u/Silent-Huckleberry28. We have contacted the winner, and their photo will be posted as soon as it is received. Thank you to everyone who participated and supported the Destroyer Team. For students preparing for...