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How does activation energy determine if a reaction will release or absorb energy?
Wiki User
∙ 12y ago
Activation energy is really just the minimum amount of energy needed for a chemical reaction to occur. Without it, the energy will stay the same and the substance cannot undergo a chemical change. The thing to look at, I think, is the product of the reaction. For example, in a graph, two substances could have the same activation energy, but after the reaction the amount of energy in substance 1 could be extremely low and the amount of energy in substance 2 could be higher than the activation energy. In substance 1, evidence of an EXOTHERMIC reaction has occurred because the amount of energy in the original substance was lost indicating that it has released energy. Whereas in substance 2, when the amount of energy was higher than the activation energy, it is evident that an ENDOTHERMIC reaction has occurred because the amount of energy after the reaction is higher than it was before the reaction. This shows that substance 2 absorbedenergy making it endothermic. hope this helps!
Wiki User
∙ 12y ago
Wiki User
∙ 11y agoThe enthalpy sign of the reaction at a given temperature and pressure is an indicator of energy exchange. A negative sign implies a release of energy and a positive sign for absorbing.
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What must be absorb before a chemical reaction can start by the reactants?
energy
Does the reaction that separates water into hydrogen and oxygen absorb or release energy?
Endothermic reaction is the breakdown of water into hydrogen and oxygen and this cause for energy to be absorbed
What are catalysts used for?
Catalysts are a complex compound that fastens the rate of reaction when added in a chemical reaction. In a normal chemical reaction, it takes say, 1 hour but while using catalysts, the rate of reaction increases so the resulting time would be less. But making no physical or chemical changes to the reaction. The way a catalyst works is simple. All it does is, absorb the reactant particles onto its surface and absorb their bond energy, making their bonds weaker. In a chemical reaction, Reactant particles need to collide with sufficient kinetic energy to overcome the activation energy for the reaction to proceed. A catalyst lowers the activation energy, so than particles with lower energy can also initiate the reaction.
Compare and contrast between exergonic and endergonic reactions?
Exergonic vs. Endergonic reactions: exergonic release more energy than they absorb. Endergonic reactions absorb more energy than they release.Exergonic reactions release energy while endergonic reactions absorb energy.
If a reaction in one direction releases energy the same reaction in the other direction will what?
absorb that same amount of energy to establish a dynamic equilibrium.
What must be absorb before a chemical reaction can start by the reactants?
energy
When an enzyme binds with its substrate the activation energy needed for the chemical reaction to occur is increased True or False?
False, enzymes lower activation energies which allow the reaction to proceed at an increased rate.
The expositon of dynamite is a chemical reactiondoes this reaction absorb or release energy?
Exothermic reactions release energy. Endothermic reactions absorb energy.
Do chemical reaction absorb energy spontaneously or do they release them?
Some chemical reactions are exothermic, some are endothermic.
Does the reaction that separates water into hydrogen and oxygen absorb or release energy?
Endothermic reaction is the breakdown of water into hydrogen and oxygen and this cause for energy to be absorbed
How do catalyst affect a chemical reaction?
Adding a catalyst will make the reaction happen faster because the catalyst makes the Activation Energy (the energy required for the reaction to take place) to lower. Meaning more molecules can acquire this lower number of energy. A chemical reaction that involves a catalyst is a special type. A catalyst, in a given chemical reaction, is something that is both an input *and* an output of the reaction equation. What that means, practically, is that a small amount of catalyst is enough to process any amount of the other inputs. (More catalyst means that a given amount will be processed faster.)
What are catalysts used for?
Catalysts are a complex compound that fastens the rate of reaction when added in a chemical reaction. In a normal chemical reaction, it takes say, 1 hour but while using catalysts, the rate of reaction increases so the resulting time would be less. But making no physical or chemical changes to the reaction. The way a catalyst works is simple. All it does is, absorb the reactant particles onto its surface and absorb their bond energy, making their bonds weaker. In a chemical reaction, Reactant particles need to collide with sufficient kinetic energy to overcome the activation energy for the reaction to proceed. A catalyst lowers the activation energy, so than particles with lower energy can also initiate the reaction.
Compare and contrast between exergonic and endergonic reactions?
Exergonic vs. Endergonic reactions: exergonic release more energy than they absorb. Endergonic reactions absorb more energy than they release.Exergonic reactions release energy while endergonic reactions absorb energy.
If a reaction in one direction releases energy the same reaction in the other direction will what?
absorb that same amount of energy to establish a dynamic equilibrium.
Is it true that an exothermic reaction absorbs heat and is categorized as dissipated energy?
Exothermic reactions release energy. Endothermic reactions absorb energy.
How does endothermic reaction absorb energy?
Yes.
Chemical reactions that absorb more energy than they release are called?
It's an endothermic reaction. When more energy is absorbed than released, it has to be absorbed from surroundings. That means the surroundings lose heat as energy is absorbed from them to complete the reaction. This translates to a cooler feeling around the reaction. If you're holding a beaker with an endothermic reaction going on inside it, your hand will feel cool because the reaction is actually absorbing energy from you. An example of an endothermic reaction is combining vinegar and baking soda.
