The anodic oxidation of substances on a single-crystal zinc oxide electrode was investigated as part of our studies of elementary reactions which are important in catalytic processes. Electrical methods for det
Chemical reactivity underlies our fundamental understanding of many physical and biological phenomena. Chemical reactions are typically initiated by heat, electric current or light. Albeit far less studied, mechanical force is yet another way to orthogon
This subcategory of single-replacement reactions is called a metal replacement reaction because it is a metal that is being replaced (zinc). Hydrogen Replacement Many metals react easily with acids and when they do so, one of the products of the reaction is hydrogen gas. Zinc reacts with hyd...
However, for most reactions, the process is exothermic and energy is released. This release is usually in the form of thermal energy. The thermal energy associated with a chemical reaction is always measured at constant pressure and is known as the enthalpy of the reaction, ΔrHθ, and ...
All chemical changes involve a transfer of energy. When zinc reacts with hydrochloric acid, the test tube becomes very warm as energy is released during the reaction. Some other reactions absorb energy. While energy changes are a potential sign of a chemical reaction, care must be taken to en...
An example of a substitution reaction occurs when zinc combines with hydrochloric acid. The zinc replaces the hydrogen: Zn + 2 HCl → ZnCl2+ H2 Metathesis or Double Displacement Reaction In a double displacement or metathesis reaction two compounds exchange bonds or ions in order to formdifferent...
leveraged to improve catalytic activity, engineering their microstructure from first principles to this end has remained difficult. Now a methodology for designing the optimal structure of a solid catalyst with the aim of achieving the highest possible activity for surface-sensitive reactions has been ...
This spontaneous reaction was used first in 1830 to make a voltaic cell. The metal is attacked by mineral acids. Reactions with sulfuric and hydrochloric acids produce hydrogen. With nitric acid, no hydrogen is evolved but the pentavalent nitrogen is reduced to nitrogen at lower valence states. ...
The catalytic activity in organic reactions A catalyst is very important in chemistry science, especially in organic synthesis; it can greatly promote chemical processes and reactions, and effectively and sustainably synthesize products. Zinc is a cheap and readily available metal (zinc is easily extrac...
Mass spectrometry and gas-solid chromatography have been used with an MOCVD growth apparatus to study the decomposition of dimethylzinc (DMZ) at atmospheric pressure. By sampling both in the reactor and in the exhaust, the concentration of DMZ and its decomposition product, methane, were followed ...