energetics

Question 1

do exothermic reactions release or absorb heat from the surroundings?

Answer 1

release

Question 2

do endothermic reactions release or absorb heat from the surroundings?

Answer 2

absorb

Question 3

is the ΔH of an exothermic reaction positive or negative?

Answer 3

negative

Question 4

is the ΔH of an endothermic reaction positive or negative?

Answer 4

positive

Question 5

in an exothermic reaction, the enthalpy of the products is ____ than the enthalpy of the reactants of the system

Answer 5

lower

Question 6

in an endothermic reaction, the enthalpy of the products is ____ than the enthalpy of the reactants of the system

Answer 6

higher

Question 7

bond forming is

Answer 7

exothermic

Question 8

bond breaking is

Answer 8

endothermic

Question 9

in an exothermic reaction, the bonds in the products are ____ than the bonds in the reactants

Answer 9

stronger

Question 10

in an endothermic reaction, the bonds in the products are ____ than the bonds in the reactants

Answer 10

weaker

Question 11

Average bond enthalpy

Answer 11

the enthalpy change when one mole of a gaseous bond is broken, averaged for the same bond across similar compounds

Question 12

which reactions are exothermic?

Answer 12

combustion reactions.
many oxidation reactions.
most neutralisation reactions