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Energy in Chemical R
Chapter 23
Question | Answer |
---|---|
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 |