Test review questions

Question 1

what is a reaction intermediate

Answer 1

a species which appears in the mechanism of a reaction, but not in the overall balanced equation.

Question 2

why is enthalpy of combustion important

Answer 2

because not all elements are made from their elements in their natural state and therefore their enthalpy formation cannot be determined

Question 3

why is bond dissociation unreliable

Answer 3

does not account for anything besides
covalent bands (IMFs) and lots of bonds need to be accounted for and very average values

Question 4

what are catalysts

Answer 4

substances that speed up a reaction by getting involved in reaction mechanism, by offering a different path with lower activation energy and is fully recovered at the end

Question 5

ways to measure rates of reactions using techniques

Answer 5

1) change in volume of gas produced using a gas syringe

2) change in mass

3) change in pH (h+ ions or acids)

Question 6

what are effective collisions

Answer 6

collisions that break bonds and form new ones

Question 7

what is activation energy (better definition)

Answer 7

the required amount of kinetic energy a particle must possess in order to have an effective collision and transfer from reactants to products