Search
- https://chem.libretexts.org/Courses/Taft_College/CHEM_1510%3A_Introductory_College_Chemistry/12%3A_Chemical_Bonding/12.02%3A_Representing_Valence_Electrons_with_DotsThe Lewis Structure of a molecule shows how the valence electrons are arranged among the atoms of the molecule. Lewis electron dot diagrams use dots to represent valence electrons around an atomic sym...The Lewis Structure of a molecule shows how the valence electrons are arranged among the atoms of the molecule. Lewis electron dot diagrams use dots to represent valence electrons around an atomic symbol. Lewis electron dot diagrams for ions have less (for cations) or more (for anions) dots than the corresponding atom. From experimentation, chemists have learned that when a stable compound forms, the atoms usually have a noble gas electron configuration—or eight valence electrons.
- https://chem.libretexts.org/Courses/Taft_College/CHEM_1510%3A_Introductory_College_Chemistry/15%3A_Solutions/15.01%3A_Tragedy_in_CameroonLake Nyos is a crater lake in the Northwest Region of Cameroon, and is a deep lake high on the flank of an inactive volcano in the Oku volcanic plain along the Cameroon line of volcanic activity. A vo...Lake Nyos is a crater lake in the Northwest Region of Cameroon, and is a deep lake high on the flank of an inactive volcano in the Oku volcanic plain along the Cameroon line of volcanic activity. A volcanic dam impounds the lake waters. A pocket of magma lies beneath the lake and leaks carbon dioxide into the water, changing it into carbonic acid. Nyos is one of only three known exploding lakes to be saturated with carbon dioxide in this way.
- https://chem.libretexts.org/Courses/Taft_College/CHEM_1510%3A_Introductory_College_Chemistry/09%3A_Quantities_in_Chemical_Reactions/9.04%3A_Making_Molecules-_Mass-to-Mass_ConversionsWe have used balanced equations to set up ratios, in terms of moles of materials, that we can use as conversion factors to answer stoichiometric questions—such as how many moles of substance A react w...We have used balanced equations to set up ratios, in terms of moles of materials, that we can use as conversion factors to answer stoichiometric questions—such as how many moles of substance A react with so many moles of reactant B. We can extend this technique even further. Recall that we can relate a molar amount to a mass amount using molar mass. We can use that relation to answer stoichiometry questions in terms of the masses of a particular substance, in addition to moles.
- https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Introductory_Chemistry_(LibreTexts)/08%3A_Quantities_in_Chemical_Reactions/8.07%3A_Limiting_Reactant_Theoretical_Yield_and_Percent_Yield_from_Initial_Masses_of_ReactantsChemists need a measurement that indicates how successful a reaction has been. This measurement is called the percent yield. The limiting reagent is that reactant that produces the least amount of pro...Chemists need a measurement that indicates how successful a reaction has been. This measurement is called the percent yield. The limiting reagent is that reactant that produces the least amount of product. Mass-mass calculations can determine how much product is produced and how much of the other reactants remain.
- https://chem.libretexts.org/Courses/Bellingham_Technical_College/Bellingham_Technical_College_CHEM_121/05%3A_Module_5_-_Solution_Chemistry/5.01%3A_Solutions_-_Homogeneous_MixturesThere are two types of mixtures: mixtures in which the substances are evenly mixed together (called a homogenous mixture, or solution) and a mixture in which the substances are not evenly mixed (calle...There are two types of mixtures: mixtures in which the substances are evenly mixed together (called a homogenous mixture, or solution) and a mixture in which the substances are not evenly mixed (called a heterogeneous mixture). When a solution, or homogenous mixture, is said to have uniform properties throughout, the definition is referring to properties at the particle level.
- https://chem.libretexts.org/Courses/Bellingham_Technical_College/Bellingham_Technical_College_CHEM_121/01%3A_Module_1_-_Matter_and_Measurement/1.14%3A_Problem_Solving_and_Unit_ConversionsDuring your studies of chemistry (and physics also), you will note that mathematical equations are used in a number of different applications. Many of these equations have a number of different variab...During your studies of chemistry (and physics also), you will note that mathematical equations are used in a number of different applications. Many of these equations have a number of different variables with which you will need to work. Note also that these equations will often require the use of measurements with their units. Algebra skills become very important here!
- https://chem.libretexts.org/Courses/Bellingham_Technical_College/Bellingham_Technical_College_CHEM_121/01%3A_Module_1_-_Matter_and_Measurement/1.15%3A_Solving_Multi-step_Conversion_ProblemsSometimes you will have to perform more than one conversion to obtain the desired unit.
- https://chem.libretexts.org/Courses/Pasadena_City_College/Chem_2A_(Ku)_Textbook/09%3A_Quantities_in_Chemical_Reactions/9.03%3A_Stoichiometry/9.3.04%3A_Making_Molecules-_Mass-to-Mass_ConversionsWe have used balanced equations to set up ratios, in terms of moles of materials, that we can use as conversion factors to answer stoichiometric questions—such as how many moles of substance A react w...We have used balanced equations to set up ratios, in terms of moles of materials, that we can use as conversion factors to answer stoichiometric questions—such as how many moles of substance A react with so many moles of reactant B. We can extend this technique even further. Recall that we can relate a molar amount to a mass amount using molar mass. We can use that relation to answer stoichiometry questions in terms of the masses of a particular substance, in addition to moles.
- https://chem.libretexts.org/Courses/Pasadena_City_College/Chem_2A_(Ku)_Textbook/09%3A_Quantities_in_Chemical_Reactions/9.03%3A_Stoichiometry/9.3.05%3A_Limiting_Reactant_and_Theoretical_YieldIn all the examples discussed thus far, the reactants were assumed to be present in stoichiometric quantities, with none of the reactants left over at the end of the reaction. Often reactants are pres...In all the examples discussed thus far, the reactants were assumed to be present in stoichiometric quantities, with none of the reactants left over at the end of the reaction. Often reactants are present in mole ratios that are not the same as the ratio of the coefficients in the balanced chemical equation. As a result, one or more of them will not be used up completely, but will be left over when the reaction is completed.
- https://chem.libretexts.org/Courses/Pasadena_City_College/Chem_2A_(Ku)_Textbook/09%3A_Quantities_in_Chemical_Reactions/9.02%3A_The_Mole_Concept/9.2.03%3A_Counting_Molecules_by_the_GramThe molecular mass of a substance is the sum of the average masses of the atoms in one molecule of a substance. Calculations for formula mass and molecular mass are described. Calculations involving c...The molecular mass of a substance is the sum of the average masses of the atoms in one molecule of a substance. Calculations for formula mass and molecular mass are described. Calculations involving conversions between moles of a material and the mass of that material are described. Calculations are illustrated for conversions between mass and number of particles.
- https://chem.libretexts.org/Courses/Rio_Hondo/Chemistry_110%3A_An_Introduction_to_General_Organic_and_Biological_Chemistry_(Garg)/02%3A_Chemistry_and_Measurements/2.07%3A_Solving_Multi-step_Conversion_ProblemsSometimes you will have to perform more than one conversion to obtain the desired unit.
