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The mercury atoms in a fluorescent tube are excited and then emit photons in the ultraviolet region of the electromagnetic spectrum. Explain (i) how the mercury atoms become excited and (ii) how the excited atoms emit photons.

(i) As they pass through the fluorescent tube, they collide with the mercury atoms within it and this collision transfers energy to the atom. This energy transfer allows the atom's orbiting electrons to move...
EH
Answered by Evan H. • Physics tutor
28896 Views

Discuss the criminal liability of Mike

In this situation Mike would be charged with Murder. Murder is a common law offence. It was defined by Sir Edward Coke as the unlawful killing of a living human being, under the queen’s peace, with malice af...
GB
Answered by Gurjant B. • Law tutor
10673 Views

Describe and explain the electrical conductivity of lithium oxide, Li2O, and lithium in their solid and molten states.

Lithium conducts electricity in its solid and molten states. Lithium exhibits metallic bonding and as such its valence electrons are delocalised in the liquid and solid state allowing electricty to be conduc...
CF
Answered by Charlie F. • Chemistry tutor
37964 Views

For the formation of phenylethanone from benzene: Name and explain the mechanism, write an overall equation and write an equation for the formation of the electrophile.

Overall equation: C 6 H 6 + CH 3 COCl ---> C 6 H 5 COCH 3 + HCl Equation for formation of the electrophile: CH 3 COCl + AlCl 3 ---> [CH 3 CO] + + [AlCl 4 ] - Name of mechanism: Electrophilic substituti...
WF
Answered by William F. • Chemistry tutor
10484 Views

Explain the roles of the rough endoplasmic reticulum and the Golgi apparatus in protein trafficking and modification.

Proteins are produced at the ribosome. Ribosomes dock to the rER membrane on translocons and peptide is inserted into the rER lumen coupled with ATP hydrolysis. The peptide folds into its tertiary structure ...
WF
Answered by William F. • Biology tutor
10714 Views