Search activation energy and thousands of other words in English definition and synonym dictionary from Reverso. You can complete the list of synonyms of activation energy given by the English Thesaurus dictionary with other English dictionaries: Wikipedia, Lexilogos, Oxford, Cambridge, Chambers Harrap, Wordreference, Collins Lexibase dictionaries, Merriam Webster. Once the reaction is under way, it releases energy and is self-sustaining. For chemical reactions that don't need an activation energy, such as metallic sodium and water for example, the reactants must be stored carefully so that they don't come into contact accidentally and cause an uncontrolled reaction. The activation of pathways in the network has everything to do with how closely linked two concepts are by meaning, as well as how a subject is primed.
An external energy source can provide the energy required to dislodge the electrons in question and allow the chemical reaction to proceed. As soon as some of these bonds are broken, for example by a spark, an explosion results. If a reaction requires activation energy, the reactants can be stored together safely, and the corresponding reaction will not take place until the activation energy is supplied from an external source. Some reactions proceed immediately when the reactants are brought together, but for many others, placing the reactants in close proximity is not enough. Both hydrogen and oxygen gas are made up of molecules with two atoms bonded together.
Only then can chemical reactions be initiated and controlled in a safe manner. When a word the target is preceded by an associated word the prime in word recognition tasks, participants seem to perform better in the amount of time that it takes them to respond. There is no known explanation for this type of activation of the enzyme. Another example is hydrogen and oxygen forming an explosive mixture. . PhD thesis, University of Illinois, Urbana-Champaign, 1981.
These reactions combine oxygen with a material that contains carbon. Search activation and thousands of other words in English definition and synonym dictionary from Reverso. How this activation is being aided and accelerated by another source of dynamic energy: irradiation from the sun. When energy is supplied to reactants from an external source, the molecules speed up and collide more violently. The spark gives a few molecules extra energy so they move more quickly and collide, breaking their bonds.
Set one or more origin nodes to an initial activation value greater than the firing threshold F. The violent collisions knock electrons free, and the resulting atoms or ions react with each other to release energy and keep the reaction going. But non-military items also arrived for activation and test. When the weights are discrete this process is often referred to as marker passing. Activation may originate from alternate paths, identified by distinct markers, and terminate when two alternate paths reach the same node. When external energy such as a flame from a match or a spark breaks some of the bonds, the resulting oxygen and carbon atoms react to release energy and keep a fire going until it runs out of fuel.
Activation energy units are units such as kilojoules, kilocalories or kilowatt hours. The carbon and oxygen don't normally react with each other because the existing molecular bonds are too strong to be broken by ordinary molecular collisions. Spreading activation is a method for searching associative networks, and , or. Spreading activation can also be applied in , by means of a network of nodes representing documents and terms contained in those documents. Activation meant turning them on and giving them a sort of basic training in the tasks they were designed to do.
In both cases energy is needed to break the initial bonds. An Activation Energy Definition To define activation energy, the initiation of chemical reactions has to be analyzed. Color hue and saturation indicate different activation values. Then, as Tony switched the activation circuit, the vertical line formed a pattern that varied in width from top to bottom. The search process is initiated by labeling a set of source nodes e.
Online he has written extensively on science-related topics in math, physics, chemistry and biology and has been published on sites such as Digital Landing and Reference. The activation energy is only required at the beginning, to let the chemical reaction start. Variations of the algorithm that permit repeated node firings and activation loops in the graph, terminate after a steady activation state, with respect to some delta, is reached, or when a maximum number of iterations is exceeded. For ions, the positively charged ions have lost an electron. Four cycles of spreading activation have occurred. While some chemical reactions start as soon as the reactants come into contact, for many others, the chemicals fail to react until supplied with an external energy source that can provide the activation energy.
This energy speeds up more molecules, breaking more bonds and allowing more atoms to react, resulting in the explosion. You can complete the list of synonyms of activation given by the English Thesaurus dictionary with other English dictionaries: Wikipedia, Lexilogos, Oxford, Cambridge, Chambers Harrap, Wordreference, Collins Lexibase dictionaries, Merriam Webster. Some oxygen and hydrogen atoms combine to form water molecules, releasing a large amount of energy. If hydrogen and oxygen are mixed together at room temperature, nothing happens. This semantic priming effect with words that are close in meaning within the cognitive network has been seen in a wide range of tasks given by experimenters, ranging from sentence verification to lexical decision and naming. The decay factor was 0.