SCH4U - FINAL EXAM | UPDATED Questions with 100% Verified Answers

SCH4U - FINAL EXAM | UPDATED Questions with 100% Verified
Answers

Question:
What is produced when electrons return to lower energy
levels?

Answer:
A bright line spectrum, releasing energy in the form of a
photon


Question:
What was Planck's contribution to the quantum mechanical
model?

Answer:
Proposed that radiant energy is emitted/absorbed in quanta


Question:
A region of space where there is a high probability of
electrons?

Answer:
Orbitals


Question:
Which of the following is the electron configuration for a
halogen?

Answer:
s2p5


Question:
What is the basis of metallic bonding?

Answer:
Closely packed atoms whose valence electrons are free to
move.

, Question:
Which of the following substances would not be polar? (a)
SO2 (b) Br2 (c) H2S (d) NH3

Answer:
Br2 because it's a linear structure that has equal sharing


Question:
Which forces exist between ammonia particles

Answer:
DD, LDF, HB


Question:
What happens in an exothermic reaction?

Answer:
Energy is released to the surroundings


Question:
What is an enthalpy change?

Answer:
The energy absorbed from or released to the surroundings
when a system changes from reactants to products during a
chemical or physical change.


Question:
What is the Law of Conservation of Energy?

Answer:
Energy cannot be created or destroyed


Question:
What is the amount of energy required for a reaction to begin?

Answer:
Activation energy