His teaching style is very strange. Very hard to learn from. He does get behind which is good, but he expects that you know things before class so unless you have alot of time to go over the notes dont expect to really understand him.

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A lot of people say he's a jerk, but the fact of the matter is that he just EXPECTS YOU TO LEARN. You can't be lazy in this class; this isn't high school. The fact that people complain just exemplifies why this is a weed out class. HW is easy. If you have problems with it, e-mail him and he will give you the answer. The exam reviews are helpful.

He tries to use examples to help you remember the material and if you have issues with the homework just ask and he will walk you through it or give you the answer. Many call him a jerk he is just very upfront about his opinions and will not tolerate excuses.

If you expect this teacher to hold your hand through chemistry...you're in a whirlwind of hurt. Awesome teacher, does not take excuses from poor students who will not help themselves when failing. Many do not like his attitude and teaching style, but honestly....its college. If you cant take initiative and do your work/read....go flip patties.

Comes right out the first day of class and says he can be an arrogant jerk; he can be, but if you show that you're making an effort, it's not that bad. Reading the book - as boring as it can be - is incredibly helpful. He'll answer emails promptly and help if you ask a specific question. He'll work through problems with you in his office, too.

Easily the best intro chem prof at ODU. Always helpful in answering questions during office hours or in emails. He really wants everyone to learn Chemistry but he won't hunt you down and make you learn.

Excellent professor. He gives a lot of examples which is really helpful.

Dr. Wallach is the man! If you put the work into it, he will be there to help you. Just dont ask any stupid questions in class. For our class he posted all the lecture videos but going to class was definitely a huge help in getting an A. I would recommend him!

Overall good teacher that knows his stuff. He can be a bit intimidating but is approachable and very helpful when need be. Key to getting a good grade is to be consitent with the test. Lab and HW shouldn't be a problem and are good buffers for avg test grades. Final is also easy

I hear Pleiban's no better, but Wallach was definitely not my favorite. not bad, just not good. He seems like the kind of guy who'd probably be fun to hang out with if he wasn't your teacher. It's a weed out class so whatever. The final was curved which helped my grade out a lot. not impossible to get an A by any reach. just gotta do some work!

When I was in high school I had Dr. Wallach as an honors chemistry teacher, & I loved him. He was a great teacher. I learned a lot about chemistry from him. I thought he was hilarious. And he does look like Sid the sloth from ice age.

Dr. Wallach is a funny dude. People say he doesn't teach well, but he does... it's just you actually have to attend class. He grades fairly and the tests are 120 points out of 100, so it is possible to get better than a perfect score! DO THE ONLINE HOMEWORK! It helps. Also, the lab portion (124) reinforces class material well.

Freshman year at Old Dominion and taking Wallach for chemistry was a great idea. I know have been tutoring chemistry for about a year and a half and could not recommend anyone better than Wallach. Yeah, he can be rough around the edges, but if you are serious about his class, then he is serious about you. Go to class, do homework, and have fun.

Awesome Prof! Reading, doing the HW and practice exams and you will get an A!! People who complain about this funny/sarcastic guy just didn't do the work!!! The tests you can get up to 120/100 ... impossible not to get an A if you are willing to work and learn!

Wallach is a great professor. He gives students every opportunity to succeed (posts powerpoints, video lectures, unit reviews, and answer keys online). His tests reflect what he teaches in class and are graded fairly. If you care about learning, you'll do fine. If you think you should get an A by doing nothing, then you're in for a rude awakening.

Good teacher! Very well taught class. Everything we do in lecture and recitation help when it comes to taking the exams. With homework, labs, recitation quizzes, and the built-in extra points on tests, he makes it way more difficult to fail than to pass. Every test isn't an easy A, but if you do what you're supposed to, then it sure is do-able.

This guy makes me laugh every day, with his references to zombies and star wars. Also he is understandable when you come to him with problems. Would definitely recommend him.

Wallach is a great teacher. Yes he is a bit arrogant BUT he knows the subject material backwards and forwards. The way he explains it makes it very easy to understand. Has his share of chem jokes but doesn't fully answer questions in class...thats what recitation's for anyways. Overall a great teacher to have. As long as you do work you'll dowell

My favorite professor at ODU.

Great class! DR. Wallach is awesome; best professor at ODU!!!

Dr. Wallach is great. If you ACTUALLY read the book and study then there is no reason why you can't pass his tests. Attendance is graded by "clicker" questions that he starts at the beginning of each class. He is willing to work with you and answer event he dumbest questions professionally and fully. I tried other prof. didn't like them. Loved him!

WALLACH IS THE BEST PROFESSOR FOR CHEM AT ODU. Wallach is awkward, cocky, & impatient but he is a really good professor & he means well. He is willing to give extra help. Exams are exactly like the questions in class and on his old tests. The hw is a lot but gives you good practice. Clickers required. TAKE HIM & TRY HARD!

He posts his old tests online for you to look at. There is no reason why you should fail this class just study some, do the homework and you will do fine. I just wish he would give more than 3% for attendance.

This professor is awesome. Dr. Wallach was nice and very informative in class and wanted you to succeed. Any bad review of him probably came from someone who was unprepared or didn't try hard enough. I had never taken chemistry before and I did great. Just try hard and do not slack off and you will do just fine. He also has awesome curves on tests.

Yo, seriously if you can't understand chemistry then you need to take him. ignore all the other ratings. Hes a great professor and he really wants to help you understand what your doing. and if you go to his office hours he WILL help you out. TAKE HIM PLEASE AND SAVE YOURSELF FROM STRESS!

He is a great and helpful professor. Take him if you really want to learn the material.

He is a great instructor if you want to learn the material. So, take him.

He is a great and very helpful Professor. If you want to learn the material well, take him.

This is the best instructor I have ever had. I hated Chem in high school, but LOVE it now. If you don't pass, you didn't do anything. He gives more than enough opportunities to make an A, including extra test points. He also posts lectures, notes, and exam guides online. Attendance is technically mandatory, but he gives quite a bit of leeway.

Lectures are SUPER helpful & easy to understand with plenty of practice examples, gives plenty of homework for practice & recitation activities are really useful on tests *hint hint* He's not the warmest professor by any means! But he is the best professor besides Melzer (who doesn't teach 121 or 122). If you study and do the work you'll be fine!

Dr. Wallach provides plenty of opportunities for students to learn the material (posts lecture pwpt waudio, test blueprints, old *NOT* practice tests). Extremely knowledgeable. 20pts XC on every exam. Clicker required. Do not expect to skate through this class. He will make you work for an A, but you will definitely learn the material thoroughly.

He is a great advisor!

I have taken him for 2 semesters now for Chemistry and would recommend to anyone! Attendance not mandatory but it does help your grade if you attend. Lots of homework, but if you do it all you should be golden for tests. Extra credit built into tests and he has plenty of review sessions throughout the semester for material. Good sense of humor!

Take this man at all cost. Very Very good chem professor. It will be hard for you to fail if you actually pay attention. He has lecture videos for all his chapters that will help you. There will be quizzes but they aren't bad if you know you chemistry. Better compared to other chem 121123 professor.

Dr. Wallach is a great professor. Yes, Chemistry is not easy, but this it isn't supposed to be. Dr. Wallach tells his students up front what is expected and if you studypay attention in class, you will easily pass. He also gives numerous resources if you need help outside of office hours. Everyone should pass this class. Be prepared to do the work

He is clear and gives extra credit if you do extra work

Great teacher!! Lectures are very informative and he has great examples in class. He is an outstanding teacher and really allows you to learn the material he is teaching

Very disappointed I can't take him for the 2nd section of chemistry. He is an amazing teacher. There is extra credit built into the tests, and yes a lot of homework, but doesn't take hours to do. The HW really helps you learn. He replies to his email very quickly and encourages people to reach out to him. Chem is hard, but he makes it more bearable

He is a great teacher! He gives a lot of opportunities for extra credit. He does give a fair amount of homework but as long as you don't try to do it all at once it's bearable. As long as you try and attend class you'll be able to get a good grade.

LOVED every bit of his lectures. He has some passive humor which makes it funny when you catch it. He is by far the clearest instructor I have ever had. Responds to emails and is always in his office hours. One of the best teachers I have had in all of my student career.

You will absolutely not find a better chem professor at ODU-- if you can, take Wallach over anyone else! He expects a lot from his students, daily homework and recitation quizzes, but you actually learn things. If you do all the homework and study a bit, the tests are not hard at all.

Chemistry is not an easy course. However, Wallach definitely makes the class simple enough to grasp. Just do all the work (yes, all of it) and study. As long as you do that you will get an A. For every test, he gives 20 possible extra credit points so study!

Dr. Wallach is a great professor who really wants you to know the material. He truly cares whether or not his students understand the material. He gives you all the tools you need to succeed; however, if you don't put in the effort, you will not be successful. If you do the homework, go to class, and study, it is possible to do very well.

He is a great professor. I took Chem 103/105 and then took his class and everything clicked together. He has a smart mouth but he is very helpful. Study the daily homework and previous unit tests to pass his tests. Studying will get you an A! do the examples on his slides because they are similar to the daily homework questions! loved his class!

I highly recommend taking Professor Wallach for Chemistry. He explains the material very well for the most part and listens to student feedback. There is a lot of work involved between lectures, chapter homework, daily homework, recitation, and lab, but if you put in the effort, you will do fine.

He is the best choice for chem class in ODU.

**Summer Term** Didn't use textbook at all. He provided everything we needed to study in the form of practice tests, and lectures notes already typed out. He made changes to the summer term to lighten the load. Hefty curve to help you out, but you should still study. Somewhat abrasive, but it's probably because he makes it easy.

Honestly one of the most understanding teachers I've ever had, I had the stomach bug on exam day and I emailed him asking what my options were and he allowed me to take it in his office the next day no questions asked

-knows how to explain concepts concisely -very cool person to be around -takes things seriously, but can be very humorous sometimes -the people who fail just don't care about succeeding -mandatory work is to the point and doesn't waste your time (but also extra review work if you need it) -very efficient teacher, doesn't waste your time in lectures

Wallach is the best gen chem professor at ODU, hands down. Don't get me wrong, it is not an easy class and you will need to put more work into it than many other 100 lvl science classes. But, if you LEARN what he teaches, you'll be fine. Tests are hard, but he puts about 12 points worth of extra credit questions on each exam.

I LOVE this teacher. He is hard as heck but he is the best chem professor on campus. He's hilarious and savage as anything. If you do the work, you will pass. If you don't, you won't pass. This isn't a class you can wing. It requires a lot of dedication and Wallach is amazing at helping if you ask the right questions

Real good professor. Good lectures. Will answer questions in and after class, but is quick to point out any faults in your question. No textbook required - all homework is on Bb. Attendance recorded using ResponseWare.

He knows his stuff. Chemistry is difficult but he really spells things out and tries to explain it the best he can. Tests you need to study for. I personally hated the portfolios. He said they would help you learn but I found that they really held me back. Do the practice tests and you will perform better. But still do the portfolios

He is a wizard

Wallach is a great professor. If you miss a lecture than you can access the class via blackboard later so you don't miss anything. If you miss to many classes then it will effect your grade. Print or the slides and write your notes on them, that helped me. I wasn't a fan of the portfolios but it was an easy helpful grade. He grades fair.

Wallach is the best chem professor at ODU. If you dedicate yourself, do all the homework, and take the practice tests, and A is definitely obtainable. In his lectures he points out common mistakes students make and ensures you don't do the same, he knows the information extremely well! Take him take him take him.

Wallach probably has every aspect of Chemistry memorized in his head honestly. And the great thing about him he is always willing to help, even on weekends. Hands down the best teacher I've ever encountered. If you have to take Chemistry do whatever you can to take Wallach regardless of class time. He makes chemistry seem like its learning ABC's

Dr. Wallach is a tough, but fair professor. He gives you everything you need in order to succeed, but the exams are extremely difficult. Mostly fill in the blank and very math heavy. Best chemistry professor at ODU for sure though.

I took his Chem121N class online. He thoroughly explained the material and gave us all of the material necessary to succeed on the exams. I would recommend taking this professor if Chem is a req class. However, there were many pointless and unhelpful homework assignments. There is a HW assignment due every day, even on weekends.

very funny but blunt. sometimes does experiments in class which are fun. has 4 tests online out of a 100 with 20 extra credit, but some people see it difficult. you have to study and work hard for this course in order to succeed. also takes attendance using clickers. does demand an e-portfolios and online assignments.

Take him. He is the best of Pleban, Mopper, and himself. All of the chem121N professors assign the same amount of work; however, Wallach actually explains well and delves past his power points. No need for the book, but it is nice to have as background. I had to earn the grade I got, but if you don't do the work, don't expect to pass.

Fantastic professor. He was very organized and provided tons of resources to help students succeed. His tests all came with 15-25 points of extra credit built in. Most tests were curved by at least a few points. There was an assigned homework after each lecture which reflected the type of material on the test. I would definitely take him again.

Best chem professor at ODU!! He cares for his students even if he's harsh on them. Always reminding the class that you have to put in effort to pass his class. Very resourceful & will answer any questions you have. MAKE SURE TO DO THE PRACTICE TESTS & PRACTICE HW!! Put in effort in this class and YOU WILL PASS. Go to ur TA's if you need extra help

While he is a bit unapproachable, All the other professors who teach this class basically take his lectures so take it right from the source. He is very intelligent and quick to answer emails. You will work for your grade but he offers great resources to succeed.

Best gen chem professor! Yes, he's intimidating/condescending at times, but students respect him. Organized, easy to follow online lectures, great at answering questions, FAST GRADER, review sessions outside class before the final (at odu and lives-stream). He goes above and beyond other prof. (other prof. use his teaching materials). Can be funny!

You can succeed if you finish the practice tests and really focus on the examples / videos! I see a lot of people skipping watching the videos but they are really the key to success

Chemistry is difficult. Wallach has found a way to make it easier to learn by flipping his classroom. This means it is up to you to go home watch his videos and take the notes then bring the worksheet to the class. In class, he provides you with TA's that will help explain what you don't understand and work you through the worksheet problems.

He is the best! all the other professors use his videos and he is very informed on chemistry! You have to be ready to work and study hard for a good grade but its possible

this was my second time taking chemistry so it was a little bit easier. At first he seems intimidating but he cares and wants everyone to pass and he can see the students who actually does the work and studies. If you watch the videos and dont fall behind and do the activities youll be fine and pass.

Dr. Wallach is very knowledgable. He explains chem in a way that is relatable and keeps you engaged. He can be like "c'mon you should know this stuff" but will still take the time to explain it to you in a way you will understand. It's also helpful that he has an extra 20 pts built into the tests, so you always have a chance for extra credit.

At first I didnt think I would like the flipped classroom, but it forced me to learn the material. He gives several types of assignments, so your grade doesnt rely solely on tests. He also gives wiggle room on tests and allows you to get a few questions wrong on tests without penalty. I overall enjoyed the way he ran class.