C3.2

Question 1

what kind of process is bond breaking?

Answer 1

endothermic process

Question 2

activation energy

Answer 2

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

Question 3

what kind of process is bond making?

Answer 3

exothermic process

Question 4

exothermic reactions

Answer 4

-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)

Question 5

endothermic reactions

Answer 5

-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)

Question 6

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

Answer 6

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

Question 7

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

Answer 7

exothermic

Question 8

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

Answer 8

endothermic