21 Chemistry Tutorials

These Chemistry tutorials are written by experienced educators, all of whom also offer private tutoring lessons. Get the Chemistry help you need, whether through these tutorials or through private tutoring lessons.

Understanding Polarity

Polarity is one of the most difficult chemistry concepts to master, but with this short tutorial you’ll soon be an expert!

Percent Yield Calculation

When given the mass of one reactant and the mass of the final product, we can use stoichiometry to find the percent yield of the product.

Balancing a chemical equation

A common skill required in chemistry is recognizing and balancing chemical equations. A chemical reaction is written out in a format that displays compounds and/or individual elements with reactants on the left side of the arrow and products to the right of the arrow.

Determine the mass of MgCl2 needed to prepare 1 L solution at 0,5 M Cl.

To prepare a certain amount (1 L) of solution (MgCl2) with a specific concentration (0,5 M or mol/Litre) of chloride, we will convert units from moles/L to mass, just like we would convert moles to mass.

Easy Understanding About Theories Of Acids & Bases

An acid always reacts with a base. There are 3 theories of Acids and Bases: 1. Arrhenius Theory is related to hydrogen ions,H+ as acid and hydroxide ions,OH-as base. 2. Bronsted-Lowry Theory is related to proton,H+,donor as acid and any proton acceptor as a base like OH-, H2O,Cl-,NH3,etc. 3.Lewis Acid-Base Theory is related electron pair…

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Easy Ways Of Identifying Oxidation-Reduction Reactions

In an oxidation reaction, the change in charge will increase. Example: Iron turns to Fe(II) ion Fe→ Fe(2+)+ 2e Only Reducing agent will undergo oxidation. In a Reduction reaction a reactant will decrease in charge. Example: Fe(2+)+ 2e → Fe Fe(II) ion turns to Fe atom. Only Oxidizing agent will undergo reduction. NOTE:Both oxidation occurs…


this is a revision for organic chemistry ALKANES general formula:CnH2N+2 they are saturated compounds,and the molecule of their compounds contain single bonds between the carbon atoms in their chains. for example: As the length of hydrocarbon chain increases the length of the vander waal forces also increases changing their physical states( from gas to liquid)…

Stereochemistry: How to determine Chirality of a Molecule

There are priority rules in order to determine whether a molecule is of the R-configuration or S-configuration. 1) Atoms with the higher atomic number have higher priority. For example, Nitrogen has a higher atomic number than Carbon so it gets priority. 2) If a decision cannot be reached (because both atoms attached to the central…

Using the Ideal Gas Law to determine the molecular weight of an unknown compound

Suppose you have a gas that you can reliably assume is an ideal gas, and that there is only one species present. You know the mass of the sample, and you have it confined at a known pressure, volume, and temperature. What is the molecular weight of the unknown gas?