Bmat Chemistry Flashcards
Electroplating
It uses electrolysis to coat a cheap metal with a more expensive one
Inert
To be chemically inactive
During electroplating,
Which electrode should the
Item to be electroplated
And The metal to be plated be
What should be contained in the electrolyte
The cathode (negative electrode) so as to attract the positive metal ions
Anode
The electrolyte should contain metal ions of the metal to be plated
Which process is used in the purification of copper
What element is at the cathode of the electrolysis
Anode?
Electrolytic refining
Small piece of Copper
Supplies copper ions for the electrolysis
When is hydrogen produced at the cathode in an aqueous solution
When the metal is less reactive than hydrogen
How many milligrams in a gram
1000
When is oestrogen released
Prior to ovulation
If a substance is liquid at room temperature and pressure , then it must
Have a temperature below 25 degrees at room temperature and pressure
During electrolysis , electrons flow in the external circuit from which electrode to which
The positive to the negative
Principal source of hydrocarbons
Crude oil
Process used in refinining crude oil
Fractional distillation
During fractional distillation, when does a molecule condense
When it reaches a point where the temperature is lower than it’s boiling point
The longer the hydrocarbon chain, the ……. The boiling point and why?
Higher
As the chain becomes longer , there are more intermolecular forces between the molecule, hence more energy is required to break these forces
Second stage of refining crude oil and explain it
Catalytic cracking
This is when the larger hydrocarbon molecules are broken in into smaller ones
Is catalytic cracking a random process
Yes it is
