What time should I take to prepare for MCAT?
MCAT , or medical college admissions test, is a hard and lengthy (7.5 hour) test taken by students to apply to medical schools. MCAT covers a great deal of subjects including general chemistry, organic chemistry, physics, biology, biochemistry, psychology, sociology, math (no calculator is allowed for science calculations), and reading comprehension. Due to the scope of the topics, to prepare for this exam, a student should take four months to six months of almost full time s
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Dilution Formula, general chemistry
Dilution is a common type of problems given to students in the concentration chapter of their chemistry class. To dilute something means to add water to the solution, which will in turn decrease the concentration. The formula for dilution is M1V1= M2V2 where M1= Molarity 1 V1 = Volume 1 M2 = Final Molarity V2= Final Volume Note, that for this formula your volume can be in any units as long as it is consistent on both sides. When do we use this formula and how do we know that
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Monday Motivator: Journey
The journey One day a son and father were traveling to the neighboring city. Son was walking next to the donkey while the father was sitting on the donkey. "Poor boy" : a man passing by said, "His small feet can barely walk while the father is sitting comfortably on the donkey." Hearing this, the father got off the donkey and put his son on the donkey instead of him. As he was walking, another man passed by saying " How shameful! The child is sitting on the donkey like a king
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Child mortality rate in Mali decreases after a study
A seven year project between US and Mali has ended recently with astonishing results. Under five child mortality decreased from 154deaths per 1000 children to 7 per 1000 children. This study suggests that for small amounts of money, child mortality can be decreased drastically and thousands of lives could be saved. How was it done? Health workers would go to houses checking on children who has symptoms such as pneumonia, diarrhea, and infant sepsis. They were given in home t
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Which of the following is weakly acidic?
SAT II Chemistry practice question. Topic: Acids and Bases Which of the following is weakly acidic? a. 0.1M HCl b. 0.1M NaCl c. 0.1M HC2H3O2 d. 0.1M CH3OH e. 0.1M KOH Solution: In order for us to answer this question we must know how to identify strong acids and strong bases. We have to memorize strong acids in order to be able to identify them. Strong acids are: HCl - hydrochloric acid, HNO3 - nitric acid, H2SO4 - sulfuric acid , HBr - hydrobromic acid, HI - hydroiodic acid
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Formula for Alkanes, Alkenes and Alkynes
Organic Chemistry formulas: Alkanes, alkenes and alkynes are three classes belonging to the hydrocarbon homologues series. These are organic compounds that are composed of carbon and hydrogen as their name implies. Alkanes have only single bonds, and are therefore saturated hydrocarbons. Their formula is CnH2n+2. Thus, for example four carbon alkane will be C4H 2(4)+2 = C4H10 Alkenes are unsaturated because they have a double bond. Their formula is CnH2n. Thus, for example fo
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SAT Chemistry overview
SAT subject test in Chemistry is administered by College Board. Time: The test is 60 minutes long Number of questions: 85 multiple choice questions Calculator: Not Allowed Periodic table that indicated atomic numbers and masses is provided on the test. Test Dates: Test is offered in August, October, November, December, May, and June. Practice: College board released 2 official tests that can be purchases on its website. To be well prepared for the test, a student has to take
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What does a cell nucleus contain?
A cell nucleus is a membrane enclosed organelle found in eukaryotic cells. Nucleus contains all of the genetic information a cell has, in the form of DNA. It also contains various proteins. For example proteins, histones, are what DNA strands wrap around to form chromosomes. Furthermore, both DNA replication as well as transcription happens in the nucleus. Transcription is the process of creating RNA from DNA template. Thus, RNA is also found in the nucleus. After it is forme
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Leafs and roots
A long time ago, there lived a rich man who had a shop. Every month he would send money to his parents, and even presents on holidays. However, no matter how much they asked him to come visit, he never did. He was always so busy with working and seeing his friends, and so he never had time to come home. One day, this man's shop burned down. All of his products and everything he had, burned down with the store. This was a very sad time. This man decided to built a new store a
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Acidity across the group and period
How do we compare substances in terms of acidity? Rule 1: For binary acids with elements in the same group, acidity increases as we go down the group (with increasing radius). For example lets compare, HCl, HF and HI. First we notice that Cl,F, and I are all in the same group, Group17. Therefore we can now compare elements in terms of their radius. Iodine has the largest radius (most down) followed by chlorine and fluorine. Therefore, HI is most acidic, followed by HCl and HF
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