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Heats of Dissociation

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All molecules are held together by bonds. These bonds come in different lengths, strengths, and numbers, but they all share one thing in common: energy. All bonds store energy which can be utilized in chemical reactions. To break a bond, energy must be put into the molecule, or system, and when a bond is formed,…

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A Quick Start Guide to Bohr-Rutherford Diagrams

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Bohr-Rutherford diagrams are simple atomic models that show the number of electrons in each shell of an atom. While they are a major simplification of what really happening in an atom, they can be useful to help with visualizing electrons orbiting a nucleus. Drawing Bohr-Rutherford diagrams is super easy using the following steps:   Find…

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The Atomic Model: A Timeline History

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Atoms. What are they? If you are taking Chemistry then you should know that they are the basic building blocks of all matter. You may have also learnt that the atom is made up of sub-atomical particles known as protons, neutrons and electrons. But did you know that the model of an atom has changed…

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Le Châtelier’s Principal

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A difficult concept in chemistry is the equilibrium of chemical equations. Chemical reactions do not always react to completion, and they can proceed in either direction if it is written with a double sided arrow. The reaction in the forward direction (looking from left to right in the equation) does not always proceed at the…

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Types of Chemical Reactions

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There are various types of chemical reactions that occur in chemistry, but many reactions tend to follow 1 of 5 main types. Becoming familiar with these types of chemical reactions will be the catalyst the speeds up your understanding of chemistry! The following are the 5 main types of reactions: Synthesis A synthesis reaction is…

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Extracting Information From the Periodic Table

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Chemistry isn’t restricted to things that happen in the lab. In fact, everything on this planet is made up of atoms – the same 118 (or more) elements that are found on the periodic table. Your first encounter with the periodic table can be quite daunting at first, in fact most students find it quite…

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Balancing Chemical Equations

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Often in chemistry chemical reactions are written in an equation form using chemical symbols. The reactants of the chemical reactants are placed on the left hand side of the reaction and the products of the reaction are placed on the right hand side of the equation. The 2 sides of the equation is then connected…

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Science Review of Metalloids

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Overview Metalloids are elements that have some properties of metals and some of nonmetals.  They are on the periodic table along the dividing line between metals and nonmetals. The most commonly recognized metalloids include the elements boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), and tellurium (Te). Metalloids Elements are commonly classified as…

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Science Review of Mercury

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Overview The element mercury (Hg) has atomic number 80, and is considered a transition metal.  It is liquid at room temperature.  Although mercury is highly toxic, it is a good electrical conductor, and is used in some electrical switches. Properties of Mercury Mercury is the only metal that is liquid at room temperature.  It is…

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Science Review of Transition Metals

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Overview The transition metals occupy a large area on the periodic table.  They all appear to have similar metallic properties, because of the way their electron shells are filled.   Many transition metals form brightly colored compounds, especially in solution.  The transition metal group includes common elements such as iron (Fe), copper (Cu), nickel (Ni), gold…

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