24 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.

Acids and Bases

In the pH scale, there are acids and bases from 0 to 14. The acids are from 0 to less than 7. The nases are from more than 7 to 14. However, there are even stronger acids and bases that goes below 0 and above 14. If you use a litmus paper, red represents the…

Moles to Grams – Stoichiometry

Avogadro’s number (6.02×10^23) is defined as the number of molecules, atoms, compounds, etc. per mole of a substance. Elementary particles like atoms and molecules are tiny. It is much easier to say there is 1 mole of a substance than 602,000,000,000,000,000,000,000 atoms in a certain substance. The molar mass of a substance is the number…

Balancing Equations

This problem will illustrate how to derive a chemical equation from a word problem and how to balance it.

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…