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Free Chemistry Help
I provide Free Chemistry Help upto High School Level. Just place your questions at the Free Chemistry Help Forum and they will be answered in no time.
Chemistry Quizzes
 I provide Practice questions in Chemistry to the students on this website. Detailed quizzes with answers have been compiled for all the courses offered here. For Chemistry Quizzes, please click here.
Useful Resources

Important Chemical Reactions

Displacement Reactions and Net Ionic Reactions
What My Students Have to Say

You have made Chemistry so simple for my daughter. She says you are even better than her professor and that her classmates would like to have you as her professor.

Meera, California(parent)

I have gained immense confidence after studying with the tutors on this website. I recommend the tutors here to everyone who needs online tutoring and homework help.

Sarah Hamilton(Math)

My exams had gone off so well after my sessions for MCAT exams with you. I have thoroughly understood Aromatic Reactions, Alkenes and Alkynes after studying with you. Thank you so much. You are the best Chemistry Tutor I have ever had.

Yashika Patel, Boston(MCAT )

You are the best tutor that I have come across in my life. Keep up the good work.


Dear Uma, We want to thank you for the all hard work you did teaching Felix chemistry: Thanks to your dedicated tutoring he was able to score 760 on his Chemistry SAT test . We are very happy with the test results.

Alex and Katrina Glozman (parents of SAT/AP/general chemistry)

Hi Uma
I got my sat score today. I received a 760 for chemistry. Thank you very much for all your teachings.Under your guidance I will be successful in chemistry..

Felix(SAT Chemistry)

My wife and I will like to thank you for helping our son do so well at AP Chemistry. Although he got a 4, given where you picked him up and the total lack of teaching in his school, the exam outcome was a realistic one.
Mrs. Sharma. my son holds you in very high regard. He describes you as "One of the best teacher in the World " and he says so with a lot of conviction.
As parents we are grateful to you for helping him change his attitude to Chemistry from total fear and intimidation to love for the subject.

Mr P Maitra(Father of AP chemistry student)

Wanted to let you know that Mallika got a 5 on her AP Chemistry exam. Thank you for your efforts.

Radhika Madhusudan mother of AP student

Hello Uma, I just want to let you know that I got accepted to Midwestern University- Chicago College of Pharmacy (my preference) and I also received an invitation to interview at University of Illinois at Chicago College of Pharmacy as well! Both of these schools are the best in my area. I am beyond excited and overjoyed. Of course, it would not have been possible without your assistance and support in organic chemistry. My professors thought that I should pursue advanced organic chemistry or even PhD's- they did not know I worked with a great tutor by my side and that it had made all the difference for me to have met you. My success in my organic chemistry class spilled over to other science classes that I took. I plan to continue working hard and perhaps, very soon, I will need another session with you! Thank you very much again! Sincerely, Cat

Catphuong Nguyen(pharmacy student)

Dear Dr. Sharma, I want you to know that I see you as a mentor. So far, in my life, it has been my mentors who have really helped me, guided me, and I know will mold me even beyond the scope of my career. I will always remember to thank you for all you do. Thank you for all of your help and guidance, Dr. Sharma. Hope you feel better and I will get Sitopladi and Honey :) Kindest Regards, Vinay Sehgal

Vinay Sehgal (organic chemistry student)

Hello Uma, Thank you for your session this morning. My daughter said it was very informative and she learnt well. She said she liked the fact that you asked her questions. Please make sure she understands her basics well, even if it takes more of your time. I have bought a package for 5 hours. As discussed this morning, please schedule the lesson for 8:00 -10:00 am EST tomorrow 3/5. Thank you again for your time and efforts. Vidya

Vidya (mother of Deepika organic chemistry student)

I got my scores-in general chemistry my correct answers were 26 out of 30 questions so my DAT score is 20 out of 30. in organic chem my correct answers were 23 out of 30 questions so my DAT score is 19 out of 30. my average DAT score is 19 out of 30...not bad. we have to see what is the cut off of new york university. it shoud be around 18 or 19 or 20..according to the office people in the university. will come to know in 2013 spring thanks to you for everything..Icouldn't have scored even this much without your help. The overall exam was not that easy..there were some pretty hard questions.specially the PAT section was quite hard when I travel to india this december I will get all the DAT books for you. barrons,kaplan,dat destroyer. thanks again ,will talk when u are free. I was called for interview. will get the result on 3 weeks

Jaspreet (DAT student)

hello uma ji, The cut off of DAT at the new york university has gone down to 17. i have a score of 19 . still waiting for my result. my application got submitted after the deadline due to some reasons. but hoping for the best. hope you are still rocking at ur lectures and wishing you luck as always

Jaspreet(DAT student)

Hi I am Shah here.I am taking regular tutoring from chemtopper for organic I from uma sharma(tutor).Today I appeared in my final examination and my professor just scanned my answers and told me to get enroll in organic II .This is never heard in USA that a professor asking a student to join a course like this.I think this is something awesome in a student's career .I am really thankful to chemtopper and specially to Uma Sharma (my preferred tutor) who really helped me a lot during my examination time.She helped me understanding organic chemistry in much simpler way by her unique way of teaching.I would like to continue with her as my preferred tutor for organic chemistry II.

Shah (2009)(organic chemistry student)

I had been a novice at Chemistry when I joined Organic Chemistry-I. In my first exam I had got ‘F’ grade and was on the verge of leaving Organic Chemistry when I found you. You have made Organic Chemistry so simple for me. I am now the topper of my class having scored 100% in my exams !!!

Kim Dewitt(organic chemistry student)

In my DAT I was in the top 93 percentile of the US for that section, which means I scored higher than 93% of all test takers. it was all thanks to you Can't tell you how much you helped.

Neha Garge(DAT student)

Hello I would like to thank a very articulate tutor Miss Uma Sharma specifically for helping me with Organic chemistry. Her knowledge of subject is amazing. The way she deals with the topics reveals her deep understanding of the subject. Her encouragement to delve deeper into the subject keeps me flocking into her session. She helps me understand my assignments well so that i am able to work independently. She was never lost for words when questioned, and i always had answers. Miss Uma Sharma is indeed an asset as a tutor. I praise her dedication and genuine love for her profession that was evident in the way she taught.

SHAH Colorado, USA(organic chemistry)

Ms.Uma was very helpful. The active teaching when she asks the student gives the student practice and ensures their understanding which I found helpful.

Neije(Moitreyee)IB student

Uma, Qian transfer from 11th grade to 12th grade on chemistry subject, she was assessed 2 days ago. When I got the news, I want to thank you again for being a very good chem teacher.

Helen( Quian's mother)

I was so happy when I heard my daughter passed AP Bio & Chem both with 4s. Her effort has paid off. I credit Chemtopper for tutoring her. My daughter's school wasn't able to offer AP classes, and I wasn't able to find tutors who taught AP in English in China, so I turned to online AP courses, and I found Chemtopper. Chemtopper's team is wonderful; both our Bio and Chem tutors are PhDs and very experienced tutors. We went through all the content in 3 months and passed the exams with satisfactory results.

Helen Feng(Qian's mother)

just to let you know that Aarti got an offer for a Pharmacy course in London ,King's colleges.She is very excited... she got all the offers from UK thanks for all yr help you gave to aarti she feels comfortable with chemistry

Renuka Patel(mother)

Really good. Tutor was well prepared and explained concepts by using different examples. The sessions are saved so they can be revised afterwards as well. ** HIGHLY RECOMMENDED **

Jamal Ahmed IB chem student

HI Uma ji, I got admission into DDS programme at NYU. Thanks a ton for helping me through and motivating me all the time I wish good luck to you . Your teaching will help make students with a strong foundation God bless you

Jaspreet (DAT student)

Dear Dr. Sharma, Would like to finish chapter 3 in tomorrow's session. I make sure to review notes after our sessions and then go back to re-read the Kaplan book. You are absolutely right: without a complete understanding of the topic, it will be very difficult to grasp the material. Thank you for helping me understand the material so thoroughly.

Vinay Sehgal (MCAT student ))

Dear Uma, My wife and I want to thank you once again for the excellent teaching that you provide to our younger son Thomas. Thanks to your dedicated teaching he, while still in 10th grade, was able to score a 5 in AP Chemistry. You helped him build a solid foundation in inorganic chemistry, and now continue to teach him organic chemistry. He is happy to be your student and we are happy you are his teacher. Sincerely, Ekaterina and Alex Glozman

Alex and Katrina Glozman (parents)

Hi Dr. Sharma, I'm reviewing Orgo Part 2. Everything you taught me is coming back very easily. Once again, thank you! Orgo is 25% of the Biological Sciences section and every point counts. Chemistry is 50% of the Physical Science section so I am making sure to keep up in that area too. Hope you have a safe trip. See you soon. Kind Regards, Vinay Sehgal

Vinay Sehgal (MCAT student ))

A great tutor who enjoys chemistry as well as teaching it. Her teaching style is very understandable and easy. Neither have i had such a good chemistry tutor or have I understood chemistry as much as i did before I started classes with Uma. Couldn't ask for a better chemistry tutor!

Sai Muttavarapu-2013

Great job teaching Organic Chemistry specifically mechanisms of reactions. Thank you.


After the session I finally understood resonance structures of organic compounds. This is a high yield topic on the MCAT. I wish my college professor could teach as well as Uma.


I'm in the IB program, and having these online sessions to review for my exams are perfect! Thanks a lot!


Really good. Tutor was well prepared and explained concepts by using different examples. The sessions are saved so they can be revised afterwards as well. ** HIGHLY RECOMMENDED **

Jamal Ahmed

It's great that you are so patient in explaining things multiple times and giving extra examples to work out to make sure that I understand the points. Thanks for all your help!


Great session, I really like how you're challenged on your knowledge, it keeps you on your toes while learning - thanks!!


very good lecture. mrs. uma know where to hit the chord


the lecture was awesome. never thought i could solve organic chemistry with ease . it has been made possible under the guidance mrs. uma sharma..a wonderful teacher who has a very fine understanding of the needs of her students .


I can tell you, the help is so valuable. I was ranging from 74-82%, everything is 90+ now waiting for the chem marks to be posted from last week. amazing tutoring in chemistry

Trevor Poole

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SAT Chemistry Exam  
Date of Exam.
The SAT subject tests are offered in Oct, Nov, Dec, Jan, May and June every year. For 2011, the test dates are May 7, 2011, Jun 4, 2011.

SAT Chemistry Exam
The test contains 85 multiple-choice questions to be answered over 60 minutes. All questions carry equal marks.
Each correct answer receives one point. Each incorrect answer is subtracted as follows:

- 1/4 point subtracted for each 5-choice question

- 1/3 point subtracted for each 4-choice question

- 1/2 point subtracted for each 3-choice question

- 0 points subtracted for questions not answered.

Skills Tested Upon in Chemistry Subject Test:
  • Recalling Knowledge: Remembering fundamental concepts and specific information; demonstrating familiarity with terminology (About 20% of Test)
  • Application of Knowledge of a single principle to unfamiliar and/or practical situations to obtain a qualitative result or solve a quantitative problem (About 45% of Test)
  • Synthesizing knowledge: inferring and deducing from qualitative and/or quantitative data; integrating two or more relationships to draw conclusions or solve problems (About 35% of Test)
Important Things to Note on the Chemistry Subject Test
  • A periodic table indicating the atomic numbers and masses of elements is provided.
  • Problem solving requires simple numerical calculations
  • The metric system of units is used
  • Calculator use is not permitted
Study Packages

The study packages for SAT Chemistry Exam have been designed to cover the complete SAT syllabus for Chemistry. The package can be customized as per your requirements.

Study Material.I use the relevant study material for SAT Chemistry Exam for comprehension of the subject in detail. I use my own presentations which have been prepared keeping the requirements of the students in mind.

Chemistry Practice Quizzes .I also provideChemistry Quizzes for SAT Chemistry Exam which students can attempt in their own time and discuss with me during the sessions. Please feel free to Contact Me for any clarifications.

Study Topics .The study topics which are covered in the SAT Chemistry exam have been given out below.

Atomic Structure
Quiz on Atomic Structure
  1. Chemical and Physical means Atomic masses
    • Chemical and Physical
    • Chemical and Physical
  2. Electron energy levels means Atomic masses
    • Chemical and Physical
    • Chemical and Physical
  3. Electron energy levels means Atomic masses
    • Chemical and Physical
    • Chemical and Physical
Study Topics : SAT Chemistry Exam

I. Structure of Matter (20%)
  1. Atomic Structure—What We Know Today
  2. Nuclear Reactions
  3. Half-Lives
  4. The Quantum Mechanical Model of the Atom
  5. Electron Configurations
  6. The Periodic Table and Periodic Properties
  7. Chemical Bonding and Molecular Structure
  8. Molecular Shape
  9. Valence Bond Theory
The States of Matter
  1. Intra- and Intermolecular Forces
  2. Solids
  3. Liquids
  4. Gases
  5. Phase Changes
  6. The Gas Laws
  7. Boyle’s Law
  8. Charles’s Law
  9. Avogadro’s Law
  10. The Ideal Gas Law
  11. Density of Gases
  12. Dalton’s Law of Partial Pressures
  13. Graham’s Law of Diffusion and Effusion
  14. Solutions

Reaction Types
  1. Balancing Chemical Equations
  2. Types of Chemical Reactions
  3. Net Ionic Equations
  4. The Chemistry of Acids and Bases
  5. Conjugate Acid-Base Pairs
  6. Acid–Base Reactions: Neutralization Reactions
  7. Redox and Electrochemistry
  1. The Mole
  2. Percent Composition of Compounds
  3. More Complex Stoichiometric Calculations
  4. Limiting Reagents
  5. Chemical Yields
Equilibrium and Reaction Rates
  1. Energy Diagrams
  2. Equilibrium
  3. Le Chatelier’s Principle
  4. Practice Questions
  1. Enthalpy
  2. Spontaneous Reactions
  3. Heat Capacity and Specific Heat
  4. Enthalpies of Reactions
  5. Hess’s Law
  6. More About Entropy
  7. Gibb’s Free Energy

Descriptive Chemistry
  1. Organic Chemistry
  2. Chemistry of Some Common Substances
  3. Environmental Chemistry
  1. Rules for Basic Laboratory Safety
  2. Common Laboratory Equipment
  3. Some Common Lab Techniques
  4. Common Experiments
Basic Measurement and Calculation Review
  1. The SI System
Chemical Formulas Review: Nomenclature and Formula Writing
  1. Formula Writing ≈25%
  2. Structure of matter ≈20%
  3. Recall of knowledge ≈15%
  4. States of matter ≈45%
  5. Application of knowledge ≈14%
  6. Reaction types≈35%
  7. Synthesis of knowledge ≈12%
  8. Stoichiometry ≈7%
  9. Equilibrium and reaction rates ≈6%
  10. Thermodynamics ≈13%
  11. Descriptive chemistry   ≈8%
  12. Laboratory

Study Material for AP Chemistry
1. Chemical Foundations  
1.1 Scientific Methods Open .pdf presentation
1.2 Units of Measurement Open .pdf presentation
1.3 Uncertainty in Measurement Open .pdf presentation
1.4 Significant Figures and Calculations Open .pdf presentation
1.5 Dimensional Analysis Open .pdf presentation

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