general chemistry

Sharing a short General Chemistry video for DAT and OAT students. In this lesson, Dr. Jim Romano explains how density problems are tested on the DAT and walks through the setup step by step. These questions are very common, especially for students early in their preparation, and mistakes...

Answer is C Quick DAT Question of the Day (General Chemistry): Root mean square speed is given by: vrms=3RTMv_{rms} = \sqrt{\frac{3RT}{M}}vrms=M3RT Consider nitrogen and hydrogen at 35°C. At what temperature would they display equal RMS speed? (See the slides below for the full setup...

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...

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...

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...

A lot of students reach out after taking the DAT once or twice and still feeling stuck, especially in general chemistry and organic chemistry. If that’s you, you’re not alone. Most of the time it isn’t about working harder, it’s about reinforcing the foundations the right way. Every time Dr...

Dr. Romano goes over the rules for naming compounds, an essential General Chemistry topic on the DAT. This video is a great refresher if you want to strengthen your fundamentals before exam day. Watch here: If you have questions after watching, feel free to post them here — happy to help...

Here's another DAT Question of the Day straight from Dr. Romano! Test yourself and then check the solution on slide two. 💥 Slide 1: Problem Slide 2: Solution

📘 DAT Daily Practice — pH Question Here's a great no-calculator-style problem students should be ready for: A) 7.0 × 10⁻⁵ M B) 2.0 × 10⁻⁶ M ✅ C) 1.0 × 10⁻⁵ M D) 1.0 × 10⁻⁶ M E) 3.0 × 10⁻⁵ M Correct answer: B Don’t forget on the real DAT, these no-calculator mental math questions come fast...

www.EducationEquityFoundation.org IF you are a premed who's low-income (objective measure: AAMC has accepted you into its Fee Assistance Program) AND underrepresented THEN my 501(c)(3) nonprofit, EducationEquity Foundation ("EEF"), offers you free online MCAT Prep (esp in Chem and/or Physics)...

"Venous blood pH is approximately 7.2. Given that pka1 for H2CO3 is 6.4 and pka2 for H3PO4 is 7.1...which of the following relationships is not true about the concentrations of various species in venous blood?" The answer is that H2PO4-is not in greater concentration than HPO42- in venous...

Hi everyone. So at my University, before you can take General Chemistry I and II, you are required to take the prerequisite General Chemistry Prep course which is worth 5 credits and has an accompanying lab. I’ve noticed most medical schools are pretty vague in that they don’t state the...

I recently got unused old EK 1001 books (between 2010 and 2012 I think) for MCAT Gen Chem and Biology. I won't be taking the MCAT for another year, but I finished gen chem and gen bio sequences, and want to keep the content sharp before I start actual MCAT prep, which is after I take all my...

Hi guys! I am currently a freshman on the pre-med track. I took general bio 1 and general chem 1 spring semester. I took the "pass" option instead of keeping my original grade of "C's". I am currently retaking general chemistry 1 again but I am not doing the best. I am considering withdrawing...

I'm about to sign up for gen chem 2 for life scientists for Winter 2020, and I'm stuck between 2 choices. There's 2 sections, and one of the professors (Prof A) is the one I have Gen Chem I with currently. His exams are easy and straightforward, but he seems to skip over some things that other...

We have space left in Dr. Romano's Summer DAT Intensive. If interested email me for more details. We also offer private tutoring for the DAT, OAT, Orgo, General Chemistry, Biochemistry, Math and more. Our instruction for private tutoring is offered in class or online. Nancy...

Hello, This is my first post so please bear with me. I received a psychology degree from a state school and graduated with a 3.9 GPA. The last year of college I decided that I wanted to enter healthcare, specifically a doctor. I had toyed with the idea before but I think I was too emotionally...

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So I just took my DAT a few days ago and wanted to post something because when I was studying I didn't see many posts that struggled with the things I did (aka QR, Gen. Chem, and RC mostly) so I thought this might help those who feel less confident about the DAT leading up to it. So for study...

Question: In a sealed 1L container, 1 mole of nitrogen gas reacts with 3 moles of hydrogen gas to form 0.05 moles of NH3 at equilibrium. What is the Kc of the reaction? The balanced equation is N2 + 3H2 -> 2NH3 The solution says that we would have (1-x)M of N2 and (3-x)M of H2, to get the 0.05M...

Should I take General Chemistry II over the summer? I’m at a community college and plan on taking it here during the summer which is 1 month and 7 days long. Or should I take it for an entire semester instead so it won’t be too fast-paced?

My book (Kaplan MCAT Gen Chem pg 27) says that for the sulfur atom in the sulfate ion, sulfur's 3s and 3p subshells can only contain 8 of these 12 electrons; the other 4 electrons have entered the sulfur atom's 3d subshell, which in elemental sulfur is empty. Why did "the other 4 electrons"...

My book (Kaplan MCAT Gen Chem pg 27) says that for the sulfur atom in the sulfate ion, sulfur's 3s and 3p subshells can only contain 8 of these 12 electrons; the other 4 electrons have entered the sulfur atom's 3d subshell, which in elemental sulfur is empty. Why did "the other 4 electrons"...

Hi, so I know that in orgo world ethers are nonpolar solvents and in an extraction the ether is the organic layer and polar water is the aqueous bottom layer (therefore water and ether don't mix). So I always assumed that ethers are insoluble in water. In the general chemistry section of the...

I was particularly confused with this question due to the fact that the answer I got when solving the problem was not one of the available choices. Why, after finding that the number of total Al2O3 atoms is ~6.02*10^21, do we multiply that number by 3 to get the number of O atoms in the...

On the 2017 OAT topics list, I don't see magnetism under Physics. Is it safe to say that I won't be seeing this topic on the test?

While I was studying for the General Chemistry section of the DAT, I encountered a question that requires the knowledge of elements' physical states at a certain temperature: Q: Consider the physical states of Cl2, K, W, Pb, Hg, Br2, and Sb. Which will be liquids at 25 degrees Celsius? Do I...

Hello SDN this is my very first post. I couldn't find an answer anywhere on on the site, but I remember looking up pre-reqs for for medical schools on the school websites and reading that one school did have an exception of some sort for this. I'm currently taking Gen Chem 2 and it includes...

Hey all, Quick question regarding the effective nuclear charge. Can't the equation for its calculation be simplified as "the number of valence electrons"? it seems that in all the examples I've seen, the effective nuclear charge is the same as the number of valence electrons. Am I just jumping...

Hey! I was wondering if someone could explain to me why we can assume Al (s) is more susceptible to oxidation compared to Zn (s). Thanks!

For real. I felt so hollow inside...there was only myself to blame. But now I'm seeing this as an opportunity to rewrite them more effectively. As neat as they were, they didnt really stick with me. Any tips on how I can write good chem notes? I want to save them for college. (chem ap)

I was going through the EK Chemistry lesson, and they explained that Guanidine HNC(NH2)2 is a stronger base than methylamine, CH3NH2. I am confused by this because I assumed that the least stable compound would be the most basic. Guanidine is resonance-stabilized, which means it should be less...

Hi all, I have a question that I cannot find the clear answer to anywhere. For gauche interactions on Newman projections, how do we decide which gauche interaction is more stable? I came across a problem in destroyer that asks you to select the most stable Newman projection, and one structure...

The 4s orbital is lower in energy than the 3d orbital, and therefore you write 4s before 3d in the electronic configuration. Why, then, is the electronic configuration for Hafnium (Hf) the following? 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p64 d10 5s2 5p6 4f14 5d2 6s2 <-- Can someone please explain to...

I've watched all of chad's videos and done the quizzes, thought I was doing well until I started doing destroyer GC problems....:lame: I'm now rewatching Chad's videos& redoing the quizzes but I don't feel like they are helping out much. I've also been practicing with bootcamp, which is near the...

Hello! I'm selling The Princeton Review (TPR ) General Chemistry Review -- It is in great condition and entirely unsullied by writing. OBO! Please feel free to PM me for additional information and ask for additional photographs. P.S. The three practice exams weren't used and are still valid...

First post here, so please cut me a little break. Long story short, I am currently taking my second semester of organic II with the lab. All my time is focused on this at the moment. I know I need to study for the DAT, and plan to within the upcoming months. My issue is, it has honestly been a...