| 单词 | activation energy |
| 例句 | Enzymes are chemical catalysts that speed up chemical reactions by lowering their activation energy. Concepts of Biology 2013-04-25T00:00:00Z Estimate the activation energy for each process, and identify which one involves a catalyst. Chemistry 2019-02-14T00:00:00Z The source of the activation energy needed to push reactions forward is typically heat energy from the surroundings. Biology for AP Courses 2022-06-09T00:00:00Z The energy that is needed to get a reaction started is called its activation energy. Miller & Levine Biology 2018-01-01T00:00:00Z A chemical reaction’s activation energy is the “threshold” level of energy needed to break the bonds in the reactants. Anatomy and Physiology 2013-06-19T00:00:00Z This small amount of energy input necessary for all chemical reactions to occur is called the activation energy. Concepts of Biology 2013-04-25T00:00:00Z The catalyzed reaction is the one with lesser activation energy, in this case represented by diagram b. Chemistry 2019-02-14T00:00:00Z Once they begin to burn, however, the chemical reactions release enough heat to continue the burning process, supplying the activation energy for surrounding fuel molecules. Biology for AP Courses 2022-06-09T00:00:00Z A catalyst is a substance that speeds up the rate of a chemical reaction by lowering the activation energy. Miller & Levine Biology 2018-01-01T00:00:00Z Rather, being bored means wanting to connect and interact with someone or something, but finding no outlet for that activation energy. Scientists who study boredom can help you channel your feelings into something productive 2021-12-05T05:00:00Z This complex lowers the activation energy of the reaction and promotes its rapid progression in one of multiple possible ways. Concepts of Biology 2013-04-25T00:00:00Z The catalyzed reaction mechanism involves a lower energy transition state than the uncatalyzed reaction, resulting in a lower activation energy, Ea, and a correspondingly greater rate constant. Chemistry 2019-02-14T00:00:00Z Figure 6.15 Enzymes lower the activation energy of the reaction but do not change the free energy of the reaction. Biology for AP Courses 2022-06-09T00:00:00Z Enzymes lower the activation energy of the reaction. Miller & Levine Biology 2018-01-01T00:00:00Z However, there remains a high activation energy requirement, as simply getting umumium into a situation where it will even approach another element is nigh on impossible. Elementary school 2019-01-29T05:00:00Z Figure 4.7 Enzymes lower the activation energy of the reaction but do not change the free energy of the reaction. Concepts of Biology 2013-04-25T00:00:00Z The choice is primarily due to kinetic factors, with the one requiring the smaller activation energy being the one more likely to occur. Chemistry 2019-02-14T00:00:00Z This complex lowers the activation energy of the reaction and promotes its rapid progression in one of many ways. Biology for AP Courses 2022-06-09T00:00:00Z Lowering the activation energy has a dramatic effect on how quickly the reaction is completed. Miller & Levine Biology 2018-01-01T00:00:00Z At home, our television is not easily accessible, so that there is “activation energy” before you can easily go watch TV. Sundar Pichai of Google: ‘Technology Doesn’t Solve Humanity’s Problems’ 2018-11-08T05:00:00Z The enzyme-substrate complex can also lower activation energy by compromising the bond structure so that it is easier to break. Concepts of Biology 2013-04-25T00:00:00Z The activation energy is the minimum amount of energy necessary to form the activated complex in a reaction. Chemistry 2019-02-14T00:00:00Z The enzyme-substrate complex can lower the activation energy by contorting substrate molecules in such a way as to facilitate bond-breaking, helping to reach the transition state. Biology for AP Courses 2022-06-09T00:00:00Z The activation energy to find something else is just too high. How will you judge me if not by impact factor? 2018-06-18T04:00:00Z Together, Bohr and Wheeler developed a model for the activation energy of nuclear fission that predicted which isotopes of uranium and plutonium would most easily be fissile. This Man Was Einstein and Bohr's Relationship Counselor 2017-11-13T05:00:00Z Even exergonic, energy-releasing reactions require a small amount of activation energy to proceed. Concepts of Biology 2013-04-25T00:00:00Z This difference illustrates the means by which a catalyst functions to accelerate reactions, namely, by providing an alternative reaction mechanism with a lower activation energy. Chemistry 2019-02-14T00:00:00Z They lower the activation energy of chemical reactions. Biology for AP Courses 2022-06-09T00:00:00Z Although the activation energy might be high, there are recommended routes for scientists who want to try setting up a cloud environment for their own research group or lab. How to catch a cloud 2015-06-02T04:00:00Z If you reduce the amount of activation energy required, tough things become easy. New Harvard Research Reveals a Fun Way to Be More Successful 2014-10-15T04:00:00Z All reactions require an initial input of energy to proceed, called the activation energy. Concepts of Biology 2013-04-25T00:00:00Z Describe how graphical methods can be used to determine the activation energy of a reaction from a series of data that includes the rate of reaction at varying temperatures. Chemistry 2019-02-14T00:00:00Z All reactions require an input of energy called activation energy in order to reach the transition state at which they will proceed. Biology for AP Courses 2022-06-09T00:00:00Z Lower the activation energy for habits you want to adopt, and raise it for habits you want to avoid. Why Do You Read 1,000 Things About Change and Never Change? 2014-10-04T04:00:00Z As the temperature rises, it becomes easier to reach a certain activation energy, thereby allowing chemical reactions, such as the ones that allow a cricket to chirp, to occur more rapidly. Sonorous Science: Have a Cricket Tell You the Temperature! 2012-10-04T14:45:03.443Z In this Letter, an arithmetic error led to the incorrect value to be reported for the activation energy EA of the gap of the ν = 0 state. Observation of the fractional quantum Hall effect in graphene 2011-07-06T17:21:34.003Z Enzymes function by lowering the activation energy of the reaction they are catalyzing, which can dramatically increase the rate of the reaction. Chemistry 2019-02-14T00:00:00Z Where does the activation energy required by chemical reactants come from? Biology for AP Courses 2022-06-09T00:00:00Z Chemical reactions, he says, require activation energy in order to begin, but once that happens they tend to proceed on their own. The Oracle of Silicon Valley 2010-05-01T16:00:00Z Alternative approach: A more expedient approach involves deriving activation energy from measurements of the rate constant at just two temperatures. Chemistry 2019-02-14T00:00:00Z Rearranging this equation to isolate activation energy yields: Chemistry 2019-02-14T00:00:00Z The unstable transition state can then subsequently decay to yield stable products, C + D. The diagram depicts the reaction's activation energy, Ea, as the energy difference between the reactants and the transition state. Chemistry 2019-02-14T00:00:00Z You’ve learned that the activation energy required for many reactions includes the energy involved in manipulating or slightly contorting chemical bonds so that they can easily break and allow others to reform. Biology for AP Courses 2022-06-09T00:00:00Z Assuming the kinetics of this reaction are consistent with the Arrhenius equation, calculate the activation energy for this decomposition. Chemistry 2019-02-14T00:00:00Z What is the activation energy of a reaction, and how is this energy related to the activated complex of the reaction? Chemistry 2019-02-14T00:00:00Z Account for the relationship between the rate of a reaction and its activation energy. Chemistry 2019-02-14T00:00:00Z The exponential term, e−Ea/RT, describes the effect of activation energy on reaction rate. Chemistry 2019-02-14T00:00:00Z How enzymes lower the activation energy required to begin a chemical reaction in the body will also be discussed in this chapter. Biology for AP Courses 2022-06-09T00:00:00Z If the activation energy is much larger than the average kinetic energy of the molecules, the reaction will occur slowly since only a few fast-moving molecules will have enough energy to react. Chemistry 2019-02-14T00:00:00Z If the activation energy is much smaller than the average kinetic energy of the molecules, a large fraction of molecules will be adequately energetic and the reaction will proceed rapidly. Chemistry 2019-02-14T00:00:00Z A catalyst can increase the rate of a reaction by providing an alternative pathway with a lower activation energy. Chemistry 2019-02-14T00:00:00Z A lower activation energy results in a greater fraction of adequately energized molecules and a faster reaction. Chemistry 2019-02-14T00:00:00Z This initial input of energy is called the activation energy. Biology for AP Courses 2022-06-09T00:00:00Z The Arrhenius equation describes the relation between a reaction’s rate constant, activation energy, temperature, and dependence on collision orientation. Chemistry 2019-02-14T00:00:00Z The higher the activation energy, the slower the chemical reaction will be. Biology for AP Courses 2022-06-09T00:00:00Z Additionally, the burning of many fuels, which is strongly exergonic, will take place at a negligible rate unless their activation energy is overcome by sufficient heat from a spark. Biology for AP Courses 2022-06-09T00:00:00Z What is the activation energy for the reaction? Chemistry 2019-02-14T00:00:00Z The activation energy of a particular reaction determines the rate at which it will proceed. Biology for AP Courses 2022-06-09T00:00:00Z Like these reactions outside of cells, the activation energy for most cellular reactions is too high for heat energy to overcome at efficient rates. Biology for AP Courses 2022-06-09T00:00:00Z This initial input of energy is called the activation energy. Biology for AP Courses 2022-06-09T00:00:00Z |
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