Webb: A chemical substance that is made up of a particular kind of atom and cannot be broken down or transformed by a chemical reaction. substance : A form of matter that has constant chemical composition and characteristic properties. It is composed of one type of atom or molecule. Chemical Substances Webb15 mars 2024 · A chemical cell produces a voltage until one of the reactants is used up. In a hydrogen-oxygen fuel cell, hydrogen and oxygen are used to produce a voltage, and water is the only product....

Which statement accurately describes the reactants of a reaction?

Webb18 maj 2024 · In a chemical reaction, catalysts function to hold a molecule in a certain position or influence the strength of the individual chemical bonds that undergo change during the reaction. Catalysts speed up reactions by lowering the activation energy necessary for the reaction to take place. WebbA catalyst is a substance that can be added to a reaction to increase the reaction rate without getting consumed in the process. Catalysts typically speed up a reaction by reducing the activation energy or changing the reaction mechanism. Enzymes are proteins that act … english spurs with straps

Chemical synthesis Britannica

Webb3 sep. 2024 · To describe a chemical reaction, we need to indicate what substances are present at the beginning and what substances are present at the end. The substances … WebbPlant cells have special organelles called chloroplasts, which serve as the sites for the reactions that make up photosynthesis. Their thylakoid membranes contain a pigment called chlorophyll, which absorbs photons (light energy) from the sun, initiating the light-dependent reactions that take place within the thylakoids. WebbGas burners, hot plates, and ovens are often used in the laboratory to increase the speed of reactions that proceed slowly at ordinary temperatures. For many chemical processes, … english spur straps