When more energy is required to break bonds than to form new ones the reaction is called gonderince

Name Ladie BradenDateClassDirections:Complete the concept map using the terms in the list below.two or more substancesdecompositioncompoundssingle displacementelementcombineDirections:Write the letter of the term or phrase that best completes the sentence.7.Which of the following does not speed up the rate of a chemicalreaction?a.higher temperatureb.more surface areac.lower air pressured.catalystOverviewChemical ReactionsTypes ofchemical reactionsincludeSingledisplacementdoubledisplacement2.1.decompositionsynthesisin whichsubstancesin whichsubstancesin which twoin which one4.3.Combineelementbreak apartpositive ionsreplace each otherto form two newreplacesanother in ato form ato form5.newsubstance6.compoundTwo or moresubstancescompounds

Key Terms Chemical ReactionsUnit 14Directions:Unscramble the terms initalicsto complete the sentences below. Write theterms on the line provide.Decomposition1. Asonoditecimporeaction is one in which a substancebreaks down into two or more substances.equation 2. A chemicalnoqituaedescribes a chemical reaction usingchemical formulas and other symbols.exergonic 3. In aningrocexereaction, the amount of energy neededto break the original bonds is less than the energyreleased when the new bond forms.Single- Displacement4. In aglinse-spladicetnemreaction, one element replacesanother in a compound.Chemical5. Alamcechireaction is a change in which one or moresubstances are converted into new substances.synthesis 6. Asnteshisyreaction is one in which two or moresubstances combine to form another substance.

One of the biggest challenges for chemistry students is understanding whether energy is required or released when chemical bonds are broken and formed. One reason this can be confusing is that a complete chemical reaction can go either way.

Exothermic reactions release energy in the form of heat, so the sum of the energy released exceeds the amount required. Endothermic reactions absorb energy, so the sum of the energy required exceeds the amount that is released. In all types of chemical reactions, bonds are broken and reassembled to form new products. However, in exothermic, endothermic, and all chemical reactions, it takes energy to break the existing chemical bonds and energy is released when the new bonds form.

Breaking Bonds → Energy Absorbed

Forming Bonds → Energy Released

You have to put energy into a molecule to break its chemical bonds. The amount needed is called the bond energy. After all, molecules don't spontaneously break. For example, when is the last time you saw a pile of wood spontaneously burst into flames or a bucket of water turn into hydrogen and oxygen? Energy must be applied for these reactions to occur.

Energy is released when bonds form. Bond formation represents a stable configuration for atoms, sort of like relaxing into a comfy chair. You release all your extra energy when you sink into the chair and it takes more energy to get you back up again.

8.In the equation H2(g) + O2(g)⇌H2O(l), the symbol⇌represents:

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1.Asonoditecimporeaction is one in which a substancebreaks down into two or more substances.2.A chemicalnoqituaedescribes a chemical reaction usingchemical formulas and other symbols.3.In aningrocexereaction, the amount of energy needed tobreak the original bonds is less than the energy releasedwhen new bonds form.4.In aglinse-spladicetnemreaction, one element replacesanother in a compound.5.Alamcechireaction is a change in which one or moresubstances are converted into new substances.6.Asnteshisyreaction is one in which two or moresubstances combine to form another substance.7.In anicehomextrreaction, the energy given off is primarilyin the form of heat.8.The kind of reaction energy that requires energy in theform of heat is calledremdothcine.9.Anorhibiintties up a reactant and prevents it fromundergoing the original reaction.10.The insoluble compound that forms during a double-displacement reaction is called atreaticipep.11.When more energy is required to break bonds than toform new ones, the reaction in calledgonderince.12.The numbers that represent the number of units of eachsubstance taking part in a reaction are calledisceffoticen.13.A chemical reaction that has the same number of elementson both sides of the equation isdeblanac.18Chemical ReactionsKey TermsChemical Reactions