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Energy in Chemical R

Chapter 23

QuestionAnswer
exothermic reactions give out heat
endothermic reactions take in heat
collision theory is used to explain the energy changes that occur when chemical reactions take place
for a reaction to occur reacting particles must collide
an effective collision is one where a chemical reaction occurs
a molecule of hydrogen is made of two atoms
reactions are faster at higher temperatures as particles move faster and are more likely to collide
an energy profile diagram shows that change in ergy of a chemical reaction with time as the reaction takes place
a catalyst reduces the activation energy
acid and base make salt and water . this reaction is exothermic
citric acid and sodium hydrogencarbonate react this reaction is endothermic
Created by: PDervin