C3.2 Flashcards

1
Q

what kind of process is bond breaking?

A

endothermic process

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2
Q

activation energy

A

minimum amount of energy required to break the bonds in the reactants and get a chemical reaction started

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3
Q

what kind of process is bond making?

A

exothermic process

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4
Q

exothermic reactions

A

-reactions that release energy to the surroundings
-the surroundings get hotter so the temperature rises
-the products have less energy than the reactants (they have released it to the surroundings)

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5
Q

endothermic reactions

A

-reactions that absorb energy from their surroundings
-the surroundings get colder, so the temperature drops
-the products have more energy than the reactants (they have absorbed the extra energy from the surroundings)

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6
Q

how do you calculate the overall energy change of bond making or bond breaking?

A

overall energy change = total energy input to break bonds in reactants - total energy released when bonds form in products

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7
Q

what type of reaction is it if the overall energy change is negative?

A

exothermic

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8
Q

what type of reaction is it if the overall energy change is positive?

A

endothermic

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