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- https://chem.libretexts.org/Courses/Westminster_College/CHE_180_-_Inorganic_Chemistry/13%3A_Chapter_13_-_s-Block_Elements/13.9%3A_Group_2/Chemistry_of_Calcium_(Z%3D20)/Calcium_SulfideCalcium sulfide, CaS, crystallizes in cubes like rock salt and occurs as oldhamite in nature. CaS has an odor of rotten eggs, which stems from H 2 S formed by hydrolysis of the calcium sulfide. It als...Calcium sulfide, CaS, crystallizes in cubes like rock salt and occurs as oldhamite in nature. CaS has an odor of rotten eggs, which stems from H 2 S formed by hydrolysis of the calcium sulfide. It also occurs as a by-product of the Leblanc process, which was in heavy use in the 19 th century before the invention of the Solvay process. In the presence of traces of heavy metals CaS becomes phosphorescent (like many other sulfides such as zinc sulfide or cadmium sulfide).
- https://chem.libretexts.org/Courses/Williams_School/Advanced_Chemistry/05%3A_Chemical_Reactions/5.03%3A_Redox_ReactionsReduction-oxidation, or redox, reactions alter the relative density of electrons around atoms. Oxidations numbers help us keep track of theses changes.
- https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Book%3A_Introductory_Chemistry_Online_(Young)/05%3A_Chemical_Reactions/5.5%3A_Oxidation_and_Reduction_ReactionsThe term oxidation describes the loss of electrons by an element and an increase in oxidation state; the term reduction describes the gain of electrons and a decrease in oxidation state. During this r...The term oxidation describes the loss of electrons by an element and an increase in oxidation state; the term reduction describes the gain of electrons and a decrease in oxidation state. During this reaction, the oxidation number of carbon has changed from zero in the reactants to +4 in the products and the oxidation number of oxygen has changed from zero to –2.
- https://chem.libretexts.org/Bookshelves/Inorganic_Chemistry/Supplemental_Modules_and_Websites_(Inorganic_Chemistry)/Chemical_Reactions/Chemical_Reactions_Examples/Chemical_Reactions_OverviewChemical reactions are the processes by which chemicals interact to form new chemicals with different compositions. Simply stated, a chemical reaction is the process where reactants are transformed in...Chemical reactions are the processes by which chemicals interact to form new chemicals with different compositions. Simply stated, a chemical reaction is the process where reactants are transformed into products. How chemicals react is dictated by the chemical properties of the element or compound- the ways in which a compound or element undergoes changes in composition.
- https://chem.libretexts.org/Bookshelves/Inorganic_Chemistry/Supplemental_Modules_and_Websites_(Inorganic_Chemistry)/Descriptive_Chemistry/Elements_Organized_by_Block/1_s-Block_Elements/Group__2_Elements%3A_The_Alkaline_Earth_Metals/Z020_Chemistry_of_Calcium_(Z20)/Calcium_SulfideCalcium sulfide, CaS, crystallizes in cubes like rock salt and occurs as oldhamite in nature. CaS has an odor of rotten eggs, which stems from H 2 S formed by hydrolysis of the calcium sulfide. It als...Calcium sulfide, CaS, crystallizes in cubes like rock salt and occurs as oldhamite in nature. CaS has an odor of rotten eggs, which stems from H 2 S formed by hydrolysis of the calcium sulfide. It also occurs as a by-product of the Leblanc process, which was in heavy use in the 19 th century before the invention of the Solvay process. In the presence of traces of heavy metals CaS becomes phosphorescent (like many other sulfides such as zinc sulfide or cadmium sulfide).
- https://chem.libretexts.org/Courses/Brevard_College/CHE_103_Principles_of_Chemistry_I/08%3A_Chemical_Reactions/8.05%3A_Redox_ReactionsDuring this reaction, the oxidation number of carbon has changed from zero in the reactants to +4 in the products and the oxidation number of oxygen has changed from zero to –2. For each of the reacti...During this reaction, the oxidation number of carbon has changed from zero in the reactants to +4 in the products and the oxidation number of oxygen has changed from zero to –2. For each of the reactions given below, calculate the oxidation number of each of the elements in the reactants and the products and determine if the reaction involves oxidation-reduction.
- https://chem.libretexts.org/Courses/Brevard_College/CHE_104%3A_Principles_of_Chemistry_II/01%3A_Electrochemistry/1.01%3A_Redox_Reactions_and_Oxidation_NumbersRedox reactions occur with changes in oxidation numbers as a consequence of electron transfers
