During a actinic reaction:
Energy is captivated to breach bonds. Bond-breaking is an endothermic process.
Energy is appear back new bonds form. Bond-making is an exothermic process.
Whether a acknowledgment is endothermic or exothermic depends on the aberration amid the activity bare to breach bonds and the activity appear back new bonds form.
Energy diagrams appearance the akin of activity of the reactants and of the products. The bigger the aberration amid the activity of the reactants and the activity of the products, the added activity is accustomed out or taken in. It is accessible to see from an activity akin diagram whether the acknowledgment is exothermic or endothermic:
In an exothermic reaction, the articles are at a lower activity than the reactants. The aberration amid the activity of the reactants and the activity of the articles is alleged the enthalpy change (∆H) of the reaction. For an exothermic reaction, the enthalpy change is consistently negative.
In an endothermic reaction, the articles are at a college activity than the reactants. This agency that the enthalpy change of the acknowledgment (∆H) is positive.
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Work And Energy Worksheet Answers
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