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What is a decimal? Decimals are another way to express fractions or parts of a whole. We need them for measurement, and it is the easiest way to express fractions on a computer or a calculator. Work through these videos to get a review of decimals overall. Adding decimals Subtracting...
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Measurements are fundamental in mathematics because they provide a means to quantify and understand the physical world. Worksheets Download the measurement worksheets to improve your skills. Dimensions (PDF) Errors in measurement (PDF) Errors in calculations (PDF) Scientific notation (PDF) Engineering notation (PDF) Rules (PDF) Calculations (PDF)...
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The ability to complete calculations using moles is very important in chemistry. Test yourself with a quiz. Your turn – mole calculations Aspirin has the formula \(\ce{C}_{9}\ce{H}_{8}\ce{O}_{4}\). Calculate the mass of aspirin in grams present in \(0.650\textrm{ mol}\) of aspirin. The molar masses of \(\ce{C}\), \(\ce{H}\) and \(\ce{O}\) are \(12.01\textrm{...
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The mole (\(n\)) is an important unit of measurement in chemistry because it allows scientists to count and quantify atoms, molecules, and ions in a given sample. This then allows them to perform calculations relating to chemical reactions. In everyday language, we use \(1\) dozen \(=12\) object, \(1\) dozen \(=10\)...
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Units are used to describe physical quantities. Being able to express units in the most appropriate way is crucial for scientific research, engineering, everyday tasks, and effective communication across measurement systems. If you expressed a quantity without a unit, it wouldn't mean much. Let's say that you tell a friend...
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Chemistry often deals with quantities (amounts) of chemicals. How do we use units to describe them? What do moles have to do with chemistry? How do we measure the mass of different components in a chemical reaction? Unit conversions, the mole, and stoichiometry are explained here. Overview Units and conversions...
