Question

1- brilliant colors in fireworks are due to electrons within the colorant chemicals

a) mixing with water in the atmosphere

b) reacting with the ozone layer

c) falling back to the ground state

2- the electron of an atom that play an important part in the formation of compounds are usually those

a) the d subshell

b) an incomplete inner (inside) enegy level

c) a complete inner (inside) enegy level

d) a complete outer enegy level

e) an incomplete outer enegy level

3- what type(s) of intermolecular forces are present in ethanol? CH3 CH2 OH

a) London Dispersion forces

b) Hydrogen Bonding

c) Ionic bonding

d) Dipole-Dipole interaction

e) London Dispersion forces, Dipole-Dipole interaction & Hydrogen Bonding.

Answer 1

1) brilliant colors in fireworks are due to electrons within the colorant chemicals

a) mixing with water in the atmosphere

b) reacting with the ozone layer

c) falling back to the ground state

Answer : c) falling back to the ground state ( During their return to the ground state from excited state, they emit color)

2) the electron of an atom that play an important part in the formation of compounds are usually those

a) the d subshell

b) an incomplete inner (inside) energy level

c) a complete inner (inside) energy level

d) a complete outer energy level

e) an incomplete outer energy level

Answer : e) an incomplete outer energy level ( Valency shell electrons are involved in the bond formation)

3) what type(s) of inter-molecular forces are present in ethanol? CH3 CH2 OH

a) London Dispersion forces

b) Hydrogen Bonding

c) Ionic bonding

d) Dipole-Dipole interaction

e) London Dispersion forces, Dipole-Dipole interaction & Hydrogen Bonding.

Answer: b) Hydrogen Bonding ( due to the presence of OH group, it forms Hydrogen bonding)