When we write a number we identify certain digits as significant (meaningful or important) and other digits as not significant because they are simply placeholders for the decimal point.

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Significant Figures in a X or ÷ calculation. The rule for significant figures in a multiplication or
division calculation is simple. Find the number in the calculation with the LOWEST number of significant figures.

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The rule for significant figures in an addition or subtraction calculation is a bit more complicated, because you ignore significant figures! Instead you look at how numbers line up with the decimal point.

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When there are several levels of calculations imbedded in parenthesis, you have to determine the significant figures within each parenthesis and work your way out to the final answer.

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Learn more about simple unit conversion highlighting dimensional analysis.

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Learn the steps how to convert units which include SI unit prefixes like identifying the starting and ending units and arranging the conversion factor in an equation.

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Go more in depth in dimensional analysis by learning how to convert units with two SI unit prefixes.

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Learn how to combine units using the steps already covered with emphasis on step three, where you identify unit conversion factors for both the numerator and denominator of the unit.

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Learn more about combinations with powers and try some practice problems.

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Identify the differences between compounds such as ionic, covalent, or acids from their formula

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Learn about type one of naming compounds, formula to name, simple ionic.

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Delve into type two of naming compounds, formula to name, complicated ionic.

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Learn about the third type of naming compounds, formula to name, covalent.

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Learn more about the topic of naming compounds, formula to name, and acids.

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Find out more on naming compounds, this time name to formula. This post is about type one, simple ionic.

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Naming compounds - from name to formula using the second type, complicated ionic.

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The third type of naming compounds, name to formula, covalent.

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Naming compounds that are acids, name to formula.

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Find out more about using Moles, Atomic Masses and Molar Masses.

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Find out more about converting Between Moles and Numbers of Atoms or Molecules.

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This post explains Percent Composition from a Molecular Formula.

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Formula from percent composition given molecular mass and percent composition.

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Learn more about formula to percent composition when given data from composition analysis.

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Try balancing equations - here's the easy one.

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Medium level of difficulty equations for you to balance.

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The final type of balancing equations, hard for you to try.

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Using the chemical equation to relate moles of one chemical to another.

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Using the chemical equation to relate grams of one chemical to another.

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Find out more about Stoichiometric problems including limiting reactant problems.

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In this post, percent yield will be discussed in relations to stoichiometric problems.

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Learn more about basic calculations using molarity.

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Find out more on molarity calculations inlcuding the molarity of ionic compounds.

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Learn more about other calculations based on Molarity.

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Learn how to write equations. Chemical equations for solution reactions can be written in three different forms; molecular equations, complete ionic equations, and net ionic equations. In class, so far, we have
been writing molecular equations.

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Find out more about assigning oxidation states. An oxidation state or oxidation number is a number that we assign to an element in a compound to show whether or not the element is missing electrons, has excess electrons, or has just as many electrons as it needs.

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Find out more about Balancing Oxidation/Reduction Equations in this post. Basic conditions means that you have more OH- and very little H+ in your solution.

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This post explains more about balancing oxidation and reduction equations. Balancing an oxidation-reduction reaction is a little simpler if the reaction is either neutral or acidic, and a little more difficult if the solution is basic.

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